FAQ
| Question | Answer |
| For connectors with operating voltages up to 36 volts, is the coil voltage the primary or the carrier voltage the declared element? | The highest voltage on the product is the main one, the coil voltage is usually very low such as 12, 24, 48VDC, etc. The main contact voltage is usually 80, 500, 750, 1000VDC, etc., which is much higher than the coil voltage. |
| What are the differences between epoxy encapsulated contactors and ceramic contactors? | Encapsulation materials are different, respectively, epoxy and ceramic materials; encapsulation gases are different, epoxy is usually paired with nitrogen, ceramic is usually paired with hydrogen, this is because hydrogen will corrode the plastic material, embrittlement, epoxy contacts in more plastic parts, not applicable; ceramic durability is stronger, to solve the high-pressure arc but the feedback signal is not stable; the cost of production is also different, compared to ceramic is more expensive, but the selling price of the two are almost the same; encapsulation methods and internal structure are different, are generally low, such as 12, 24 VDC etc., far higher than coil voltage. The cost of production is also different, compared with the ceramic is more expensive, but the price is almost the same; encapsulation and internal structure is different. |
| Which series of products does our company specialize in developing, producing and selling? What is the core function of this series of products? | We specialize in the DC contactor series of products, the core function: through the small current control of high current; protection of circuits and equipment; precise control of load equipment; reduce energy consumption. |
| What are the current mainstream applications of our DC contactors? What other industries can they be used in? | Mainstream applications include charging piles, electric vehicles, industrial vehicles (construction vehicles), inverters, energy storage, and communications. It can also be used in agricultural equipment, military industry, robotics industry and so on. |
| What are the pain points of the mainstream application of our products in several industries? | Charging pile industry because of the use of the scene led to the product temperature rise conditions are too high, because of the high temperature environment, so the need for low temperature rise of the product; industrial vehicle industry (usually below 200v, low voltage), the current fluctuates in the use of the process, the need to add a zero point, can not be used with open DC contactor, the current is very harsh; energy storage industry, the voltage requirements are very high, with high voltage. |
| For B2B business, what are the similarities and differences between domestic and overseas sales? | The similarity lies in the need to take the initiative to develop customers, in-depth understanding of the company’s products. The difference is that compared with the domestic worship door to door, foreign customers more through the mail, whatsapp and other ways to understand the parameters of the product, the certificate of authentication and other product requirements; different countries for the focus is also different, some countries pay more attention to the price (India) Some countries pay more attention to the product qualification, including certification, factories, and other requirements (Europe and the United States) |
| Based on your understanding of our products and applications, what are the hot countries or regions for overseas sales of our products? What are the future trends? | Currently in contact with the customer, Europe and Southeast Asia customer demand intention is greater, the future will cover a wider and wider range of countries, more still need to be in practice to draw more accurate conclusions. |
| After identifying the key purchasing decision makers of potential customers, how to communicate and interact with the information to promote the work so that the customers will place orders for prototypes? | Organize the two sides selection engineers and R & D engineers for the exchange of needs and solutions, to determine a good selection, we provide solutions, and provide specifications (if new products need to be re-produced), to promote the customer to purchase prototypes, installation testing. |
| In the company’s mainstream application industry, in the overseas market promotion and communication, overseas customers will ask about the comparative advantages of the company’s products and competitors, what are the advantages of each? | 1. Advantage of customized service: other large companies do not necessarily have. 2. Price advantage. 3. Longer product life: e.g. lower product temperature rise. |
| What are the classifications of DC contactors according to the sealing form of the product? What are the core features? | Divided into sealed type: epoxy encapsulated DC contactors and ceramic encapsulated DC contactors; and open type: plastic encapsulated DC contactors. Electrical insulation, more stable and reliable, suitable for high voltage and high current work. |
| What are the two types of DC contactors according to the driving mode and what are their characteristics? | Single & Dual Coil + Wide Voltage 50-100A single coil, characterized by low cost. Above 200A use double coils, characterized by the ability to carry large currents or unstable current products. |
| What are the three major series of DC contactors that make up the internal structure of our products? | Main contact system, electromagnetic system, arc extinguishing system |
| If someone asks you for advice, how to explain the DC contactor working principle is? | The DC contactor has an internal electromagnetic coil, when the coil is energized, it generates a magnetic field, this magnetic field attracts the contacts to close, thus making the current path. When the electromagnetic coil is de-energized, the magnetic field disappears and the contacts lose their attraction, thus separating and cutting off the current path. The same principle as the electric bell: when the electric current passes through the bell coil, the magnetic field generated attracts a piece of iron to collide with the bell and make a sound. |
| What is an electric arc? What are the hazards of arcing? How does our product high voltage DC contactor realize the arc extinguishing? | An electric arc is a gas discharge that occurs due to a voltage difference between two conducting bodies. When the voltage difference is large enough, atoms and molecules in the air are ionized and form a plasma, resulting in a visible arc. The arc is usually accompanied by high temperatures, intense light and sound. It is usually prone to explosions producing burns, fires, equipment damage, grid damage and other hazards. Nitrogen is used in epoxy contactors and hydrogen in ceramic contactors. |
| How does DC contactor realize the function of main contact without polarity? What is the significance of this function? | The polarity-free function is realized by designing the orientation of the magnets to make the arc deflection movement. When the magnetic blowing arc extinguishing, the arc deflection direction is opposite and will not touch each other. Practical significance: there is no positive and negative poles connected to the opposite phenomenon, convenient installation, improve safety. |
| What are the coil control methods for DC contactors and what are their characteristics? What are the coil control methods for each housing in our series? | Manual control, time-consuming and labor-intensive; electrical control, convenient; remote control, more costly and more flexible. 50-150A applies to single coils, 300A and above applies to double coils or adopts PWM wide voltage (in order to reduce the size of the use of double coils or energy-saving boards) |
| What is the function of the auxiliary switch in a DC contactor? | The function of auxiliary switch is the same as the main contact, it is a mirror principle, through signal transmission, used to detect and indicate the status of the main contact. But sometimes it will produce misjudgment. |
| What is the mechanical and electrical life of a DC contactor? | Mechanical life is the number of times an appliance can be operated without energizing the contacts of the contactor and without applying the rated coil voltage to the operating coil to operate it at a specified mechanical maximum operating frequency before the appliance is required to be repaired or any mechanical parts replaced. Mechanical life is the number of times an appliance can be operated without load without the need for repair or replacement of mechanical parts. The electrical life of the appliance is characterized by the number of cycles of on-load operation under the conditions of use specified in the relevant product standards, which is the number of times that the appliance can reach the electrical life of the appliance before it needs to be repaired or replaced. Electrical life is the number of times an appliance can withstand the load operation limit without repair or replacement of parts at rated load. |
| What is contact sticking? In which industry does this phenomenon occur? How do our products solve contact sticking? | Due to the large change in current caused by the contact fusion welding, resulting in sticking; mainly occurs in industrial vehicles and other fields; Solution: 1. Contact material selection: silver tin oxide, more resistant to high temperature. 2. Improvement of electromagnetic system can effectively reduce the dynamic melt welding. 3. Selection is very important, to choose the contactor that can cover or even greater than the voltage and current of the customer’s product. |
| What do you understand by product temperature rise? What are the product standards for temperature rise in different parts of the product? | The temperature of the components of a device above the ambient temperature. The conductor current generates electric current and emits heat, and the temperature of the surface rises continuously until it stabilizes. Judgment conditions are in all the test points in 1 hour test interval before and after the temperature difference does not exceed 2K, this time the measured temperature of any test point and test the last 1/4 cycle of the average value of the ambient temperature difference is called the temperature rise in K. |
| Is the difference in electrical life and temperature rise mainly dependent on the power of the product or are there other factors? | (1) Electrical life, temperature rise is one of the performance indicators of electrical switch products, specifically, electrical life, that is, the product at the rated voltage through the rated current, the product can successfully open and close the number of times the action, the number of times in the life of the product has not been damaged; Temperature rise performance characterizes the phenomenon of heat generation of an electrical switch, the performance of this performance by the intrinsic design of the product is determined in the laboratory to test this parameter, is at 20 degrees Celsius room temperature environment, at the rated voltage, with the rated current, after a few hours to detect the product temperature change until there is no significant temperature rise within a fixed period of time. This performance is determined by the inherent design of the product, in the laboratory to test this parameter, is at 20 degrees Celsius room temperature environment, in the rated voltage, and rated current, after a few hours, the detection of the product’s temperature change until there is no significant temperature rise in a fixed period of time, which means that the product’s temperature reaches the equilibrium, the product temperature at this time subtracted from the room temperature value of the difference between the value of the product is the temperature parameters of the product, so that the smaller the temperature parameter is, the better the product’s performance is. So, the smaller the temperature rise parameter, the better the product performance. |
| How is the solenoid coil of a DC contactor energized and de-energized? | Coil power supply is powered by external power supply, customers need to provide additional power supply for coil power supply when using. |
| Some batteries are capable of operating in environments from -40°C to +225°C. Are our products suitable for such extreme environments? | There are working environment, -40 degrees to 85 degrees. |
| One of the problems with charging piles: load breaking? Or on-load sectionalization? | The core function of electrical switch products is to “close” or “break” the circuit, so it is “break”, which means to disconnect. |
| Keywords for customer acquisition | Product word: DC Contactor Words from the customer’s company name: Customer product words: charging station,battery,energy storage device,forklift |
| The difference between rated voltage and load voltage, who is greater than whom? | Rated refers to the nominal parameter of the product, which is the maximum value that the product can tolerate, and the load voltage is generally the voltage added to the product when the product is specifically used, so it is usually said that the load voltage can not be greater than the rated voltage. |
| Are our products used in energy storage converters in the energy storage industry? The English name is PCS. | In the energy storage system, it is mainly used in BMS, battery packs and DC convergence cabinets. For details, please refer to the document “Energy Storage System Solutions”. |
| What is the depth of detail required for the working conditions? | There is a specific “working condition confirmation table”, in the company to apply for specifications or prototypes, but also in the CRM to go through the process, which also have the requirement to fill in the information on these conditions, otherwise, it will not correspond to a product model. |
| Customers inquiring about product selection (e.g. voltage, current size) in the case of several kinds of fit, how to more comprehensive for the customer selection or answer the question | According to the specific working conditions of the customer’s equipment to communicate, first know the application industry, to determine the voltage, and then the long-term use of the equipment under the load current to determine the product shell frame. |
| How to learn about the customer’s past use of products and the customer’s future projects when the customer cannot meet in person. | This relates to the specific “ability to talk and communicate”, a person’s ability is high or low, here, the same method, some people can use it well, some can not. In this world, no one is obligated to help you unless you have something of equal value to offer, something that will interest the other person. In other words, how the other person treats you and whether or not they share with you is not determined by the other person, but by you. If you demonstrate a topic or value that is of interest to the other person, they will be “hungry” for you. In the same way, I or the company share with you, of course, is to know everything, however, each of you can reach a high level of each business person, there are many other factors, there are internal, there are personal talent, there are factors of personal efforts; and there are also external factors of the environment. |
| How to make our customers want to use our products through our product advantages when they are known to be using friendly products (e.g. East Asia). | This is a good question, with the depth of the work, we will meet customers, customers use different brands of competitors, our products and different competitors compared to the different differences. (1) If you meet “East Asia”, analyze the company, its domestic business is not as strong as An Laiqiang, the popularity of the company abroad is much higher than An Laiqiang, the reliability of its products is also good, the company’s size is slightly larger than the An Laiqiang, for such a brand, we have to reflect our “customized ”, “price advantage”, “technical exchanges and services,” the characteristics of these aspects. (2) If you meet “TE”, which is a U.S. veteran company, is a large company, then there are large companies have the problem of “store big bully customers,” the customer’s needs ignore, and higher product prices, then we play the main “Price advantage”, ‘customization’, the same such competitors such as ‘Hongfa’. (3) If you encounter a small brand competitors, that highlights our complete product range, product performance indicators, technical support and service advantages. In short, analyze the characteristics of specific competitors, reflecting our differentiated advantages. |
| For our product line, how to specify which industry it is suitable for. | Different industries, mainly differentiated by the apparent difference in voltage, during this time, Ada, Zeoy responsible for the MIC and Google independent station project process experienced some of these distinctions, our product classification, there are several classification methods, one of which is classified according to voltage, for example: 1) Those below 200VDC are adapted to the industrial vehicle industry; 2) Those of 200-1000VDC, adapted to charging piles, buses, electric vehicles and other industries; 3) Those above 1000VDC, adapted to photovoltaic, energy storage and other industries. |
| In the process of customer development, how to poke at the customer’s current pain points for recommendation in the case of known customers’ industries. | It involves two main things: 1) What is the pain point of this industry at the moment? a) Industrial vehicles: the use of products in this industry is prone to contact sticking, this is the pain point, if it is cold storage conditions, the original open DC contactor is prone to contact frost and can not be circuit conduction, so the anti-adhesion performance, sealed products is the solution, at the same time, this large industry, for a long time, the traditional DC contactor used are generally open DC contactor, these products Large volume, installation size and our products are not the same, if the customer wants to replace our products, we have to redesign the installation method, if our products do not affect the original installation can be directly used by the customer, but also the characteristics, which is customized, is achievable. b) Charging pile: there are several pain points in the industry: one is the product high-voltage electric life is low, the product use cycle is not long, or because of the arc damage to the contacts lead to product temperature rise abnormally high; two is the product in the charging pile in the electrical installation is prone to electrical connection point contact, resulting in serious product heating, and even burnt; three is the industry competition is fierce, especially sensitive to price. c) Energy storage: this industry requires high performance and reliability of the product, so the degree of industry volume is not obvious, product performance is the first place. This industry is generally divided into “household storage” and “industrial and commercial energy storage”, household storage is mainly used in 100A high-voltage products, product testing requirements such as electric life, breaking capacity and other stringent requirements, our products have passed the test, the success of domestic “Sunshine Power”; industrial and commercial energy storage is also known as large storage, mainly used in 1500VDC 250A and 400A products, can truly realize this value of the product brand is not much, our products have been able to achieve, high-voltage products are reflected in the dielectric properties, high-voltage electric life and high-voltage breaking capacity. 2) What is the future development trend of this industry? You can communicate with customers, not only to share the current industry pain points and our products can provide solutions, at the same time, but also talk about the future development trend of the industry and our technical reserves and even new products in the research, which is the customer, especially the selection of engineers value. For example, industrial vehicles, higher-power vehicles will be the direction, at this time, DC contactors need to withstand a greater ability to withstand the current is stronger, which is called “short-term withstand capacity”, in layman’s terms, that is, in a very short period of time, such as 10mS within the instantaneous high-current such as 3,000A, the product’s contacts will not stick. For example, in the field of charging pile, we have higher voltage products launched in the future, at the same time, completely solve the customer copper row connection point contact industry pain point, in addition, in the face of the charging power continues to rise, we have a larger current of new products such as 800A, 1000A; at the same time, we also have a modular product launch such as switching module, AC module, gun module, easy to use for the customer, convenient for the future operation and maintenance of the charging pile. We also have modularized products such as switch module, AC module and gun head module, which are convenient for customers to use and for the operation and maintenance of charging pile in future. |
| What kind of working conditions should auxiliary contacts be used in? | Auxiliary contacts, also known as the academic “mirror contacts”, as the name suggests, like the main contacts of the mirror, and the main contacts consistent state, the main contacts are closed, auxiliary contacts are also closed; the main contacts are disconnected, auxiliary contacts are also disconnected. Through the auxiliary contact connected to the external devices, can play the indication, alarm, linkage control and other functions. |
| For the operation principle of our products, the role of each internal part of the product, whether there is a corresponding illustration to facilitate a quick and simple understanding of the product. | Yes, this is described in detail in the document “DC Contactor Basics”. |
| Difference between locked contactor and normally closed contactor Advantages and disadvantages | Latching contactors are mainly used in DC motor starting circuits, latching contactors are used to cut off the resistance of the motor armature circuit step by step, the contacts of the contactor are kept open under normal conditions, and the contactor remains open when an inrush current is generated during the motor starting process. This type of contactor consists of two sets of coils, a closing coil and a latching coil. The latching coil prevents the inrush current from causing the contactor to close when the motor is started. Normally closed contactor, means that the main contacts of the contactor are closed when not energized, and the main contacts are open when the coil is energized. Through the above terminology, it can be clearly understood that a latching contactor has an additional latching coil than a normally closed contactor, which can work more stably and reliably in the case of inrush currents during motor startup. |
| New energy vehicle is not our target customer, then in the industrial vehicle category, which kind of factory will be our target customer. | Industrial vehicles and new energy vehicles, a little different. First of all, to be familiar with the tram, whether it is a new energy vehicle or industrial vehicles, there are “three electric”, that is, “motor, electronic control, battery”, which in the two positions have to use our products, that is, “electronic control system, battery packs “. In the industrial vehicle industry, there are a variety of forms: some industrial vehicle manufacturers do their own electronic control systems or battery packs, in this case, to find the vehicle manufacturer is possible, but even in this case, the customer is often several divisions within the electronic control system or battery packs will be produced in an independent business unit, and the vehicle assembly plant is still separate. The other situation, which is also the biggest one, is that the electronic control system and battery pack are purchased by the OEM from an outsourcing company. |
| At present we understand some of the application of DC contactors industry, but in the positioning of the customer base on this point is still very poor, such as in the electronic control system, how to lock the production of electronic control manufacturers? Is there some commonality in the naming? | All electrified vehicles, electrified ships, electrified aircraft, there are “three electrics” that is, batteries, motors, electronic control, our DC contactors are used in two of the electrics: battery packs, electronic control systems. Take a case study, for example, an electric forklift manufacturer, the battery pack it needs generally comes from two directions, either from outsourcing the battery pack supplier, or forklift factories have their own production of battery packs of the workshop, or business unit; electronic control system is also basically two sources of direction, self-produced or outsourcing the supplier. Therefore, when looking for manufacturers of battery packs or electronic control systems, there are two categories, one is the vehicle factory, the other is the battery packs, electronic control systems of professional manufacturers. When searching in foreign languages, the names of these specialized manufacturers usually have words such as energy, power, battery, controller and so on. |
| At present, we understand some of the application of DC contactor industry, but in the positioning of the customer group this point is still very poor, for example, in the electronic control system, how to lock the production of electronic control manufacturers? Is there any commonality in naming? | EVQ300G12D01A572 EVQ epoxy package, 300A current rating, G non-polarized primary contact with one set of auxiliary contacts (normally open), 12 coil voltage, D leaded without insert, 01 female threads, A bottom mount, 5 is 200 shell frame (200-350A), 7 of 72 is 1000VDC rated voltage, 2 is automotive grade |
| Please explain the product description of the product model number: EVQ300G12D01A572 | 1. Industrial vehicle industry Industry pain points: easy to contact sticking; in the cold storage environment contact frost does not conduct electricity. Solution: use silver oxide tin material in the contact position to reduce the fusion welding; sealed contactor can solve the problem well. 2. Energy storage industry Industry pain points: the requirement of charging and discharging the same port; no polarity; high voltage requirements Solution: no polarity; voltage above 1500V; complete certification. 3. Charging pile industry Industry pain points: contactor and copper row point contact lead to temperature rise; high voltage, low electric life Solution: Our products have reached the industry requirement of 1000V, 1000 times electric life. 4.Electric Vehicle Industry Industry pain point: Solution: |
| Please explain what information needs to be exchanged when developing a new customer in order to determine the product model number? | Product naming specification as well as working condition table 1. System voltage; 2.Rated current; 3. contact form; (the main contact is usually normally open NO: open when not energized; the main contact is normally closed suitable for frequent energized work; bistable magnetic retention, i.e. zero power consumption) 4. coil voltage; 5. whether there is pre-charging; (the main circuit is connected in parallel with the pre-charging circuit, first let the pre-charging circuit closed, reduce the current, the capacitor will be charged to more than 80%, the main circuit can work normally, with pre-charging is to supply power to the motor, the motor to be connected in parallel with the capacitor, the need for large capacitors to run the capacitor discharge, reduce the spike current, to prevent short-circuiting, anti-sticking) 6. Load type; (inductive, capacitive, resistive) 7. Whether you need terminals, wires 8. Coil category; (corresponding to the coil voltage) 9. Product specification |
| What are the two methods of coil control for our products besides the single coil? What is the polarity of the coil leads for each of the three methods? | There are also humbuckers and energy savers, where single coil coils have no polarity and humbuckers and energy saver coils have polarity |
| Are all of our main contacts non-polarized? How is this achieved? | The whole series of products have realized the performance requirement that the main contact of the product has no polarity. Specific realization: set a piece of strong magnet on each side of the two static contact line, the direction of magnetic force line is the same. Whether the current is forward or reverse, the two arcs at the two contacts will move in two opposite directions and never meet, thus realizing non-polarity, i.e., no matter whether the current is flowing in the forward or reverse direction, the product can work safely and reliably. |
| Lord briefly explain the difference between open DC contactors, epoxy DC contactors, ceramic DC contactors, and solid state DC contactors. | 1. Solid-state DC contactors have a long life, hundreds of millions of switching times; fast switching speed, as low as a few milliseconds to a few microseconds; no contact output, no sparks, no noise; high cost, need to dissipate heat, control power is small, and easy to reverse the reverse breakdown voltage leading to product obsolescence. 2. Ceramic DC contactors are sealed by ceramic brazing and filled with hydrogen, the cost is higher than epoxy DC contactors, but there is not much difference in the market price. 3. Open type DC contactors are used in low voltage products, because of its low voltage produces less arc so there is no need to seal; because of the air as an insulating medium, need to reserve a larger contact gap and insulation distance, so the volume is large. |