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EV Charging Infrastructure
-- Steady & Reliable Manufacturer --
Introduction
Relays for EV charging infrastructure are electromechanical switching devices engineered for AC and DC power circuits within electric vehicle supply equipment (EVSE). These components manage high inrush currents during connection events and provide galvanic isolation between control and power circuits. Contact configurations include 1A (SPST-NO), 1C (SPDT), and 2A (DPST-NO) to accommodate diverse charging station architectures. The magnetic latching variant reduces coil power consumption to zero in steady states, minimizing heat accumulation inside compact charging enclosures. Dielectric strength of 4000 VAC between coil and contacts supports basic insulation requirements per IEC 61851-1. Mechanical endurance exceeds 100,000 operations, with electrical life rated for at least 10,000 switching cycles at rated load.
Huajin Technology — EV Charging Relay Manufacturer
Huajin Technology Jiaxing Co., Ltd. is a relay manufacturer established in May 2021, operating from an 8,000-square-meter facility in Jiaxing City, Zhejiang Province. The company employs over 120 staff and maintains an annual production capacity exceeding 10 million units for magnetic latching relays. ISO9001-2015 certification governs quality management processes, while product certifications include CCC, TUV, and State Grid approvals. In the EV charging sector, Huajin supplies relays to charging station OEMs and infrastructure operators, supporting both residential AC wall boxes and high-power DC fast-charging stations. Export volume accounts for approximately 30% of total production, with shipments to European, Southeast Asian, and North American markets.
Specifications
| Parameter | Specification |
|---|---|
| Contact Configuration | 1A (SPST-NO), 2A (DPST-NO) |
| Contact Material | Silver Tin Oxide (AgSnO2) |
| Coil Voltage Options | 5V, 12V, 24V, 48V DC |
| Max. Switching Voltage | 440 VAC / 300 VDC |
| Max. Switching Current | 40A, 80A, 100A |
| Max. Switching Power | 17,600 VA (AC) / 30,000 W (DC) |
| Electrical Endurance (Resistive) | ≥ 10,000 operations |
| Mechanical Endurance | ≥ 1,000,000 operations |
| Coil Power Consumption | Approx. 1.5W (single-coil latching) |
| Operating Temperature | -40°C to +85°C |
| Safety Approvals | TUV, CCC, State Grid certified |
Applications
- Residential AC wall box chargers
- Public AC charging stations
- DC fast-charging stations (50kW–350kW)
- Fleet depot charging systems
- Integrated charging and metering units
Advantages
- High inrush current withstand capability
- Zero standby power consumption
- Compact footprint for PCB or DIN mounting
- Bi-directional switching for V2G applications
- Arc-resistant chamber design
Frequently Asked Questions
What is the service life of an EV charging relay?
Electrical endurance under rated resistive load is ≥ 10,000 operations. Mechanical endurance is ≥ 1,000,000 operations. Actual service life depends on switching frequency, load characteristics, and environmental conditions within the charging station.
Are these relays suitable for both AC and DC charging stations?
Yes. The relays are designed for both AC and DC applications. For DC fast chargers, the arc extinguishing mechanism is optimized for direct current interruption at voltages up to 300 VDC.
Can the contact material be customized?
Yes. While AgSnO2 is standard for anti-welding performance, alternative contact materials such as AgNi or AgCdO can be offered based on specific current, voltage, and inrush current requirements.
What certifications does this relay series hold?
This relay series holds TUV certification for European market access, CCC certification for China, and State Grid certification for utility-grade applications. Additional certifications can be pursued based on customer requirements.
Material Selection Guide
- Contact Material — Silver Tin Oxide (AgSnO2): Recommended for high-current switching with frequent operations. Provides resistance to contact welding and arc erosion, maintaining stable contact resistance over life.
- Insulation Material — UL94 V-0 Flame-retardant Plastics (PBT/PA66): Provides high dielectric strength and tracking resistance for safety in high-voltage equipment.
- Core and Yoke — High Permeability Silicon Steel: Enables strong magnetic latching force with compact design, contributing to low power consumption.
- Terminals — Brass with Tin Plating: Provides solderability and corrosion resistance for reliable electrical connections.
Production and Customization Services
Huajin Technology manages the entire production process from coil winding and contact assembly to final testing. Customization options include coil voltage (3–60 VDC), terminal types (PCB pin, quick-connect, screw type), and packaging specifications. Operational characteristics such as pick-up and drop-out voltages can be adjusted to match control board logic. Full compliance testing to TUV, CCC, and other international standards is available as part of OEM/ODM services.
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Established in May 2021
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Annual exports account for about 30%
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The company occupies an area of 8,000 square meters.
Huajin Technology Jiaxing Co., Ltd. was established in May 2021 and is located at 707 Yanyu Road, Yucheng Town, Haiyan County, Jiaxing City, Zhejiang Province. It is a high-tech enterprise specializing in the research and development, production, and sales of relays.The registered capital of the company is 10 million yuan, covering an area of 8000 square meters, with more than 120 employees. The annual production capacity of magnetic latching relays is over 10 million, of which exports account for about 30%. The company has obtained ISO9001-2015 quality management system certification, and its relays have passed CCC certification, State Grid certification, TUV certification, etc. It also holds multiple technical patents. Our main products include motor relays, single-phase, two-phase, and three-phase magnetic latching relays, which have a wide variety of types and can meet various customized solutions for customers.
