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High Current Switching
-- Steady & Reliable Manufacturer --
Introduction
High current switching relays are designed for power circuits requiring continuous current handling from 40A to 100A. These components are deployed in EV charging stations, industrial power supplies, and battery energy storage systems where load currents exceed the capability of standard signal relays. The contact system incorporates silver tin oxide (AgSnO2) materials to resist welding under inrush conditions and maintain stable contact resistance across the operational life. Magnetic latching actuation enables zero power consumption in the steady state, reducing coil heating and improving system efficiency. The relays support bidirectional current flow and are rated for DC interruption up to 300 VDC and AC interruption up to 440 VAC. Mechanical endurance exceeds 1,000,000 cycles, with electrical endurance of ≥ 10,000 operations at rated current.
Huajin Technology — High Current Relay Manufacturer
Huajin Technology Jiaxing Co., Ltd. specializes in the production of high current switching relays for power electronics and energy infrastructure applications. Located in Jiaxing City, Zhejiang Province, the company operates an 8,000-square-meter facility with over 120 employees. Annual production capacity for magnetic latching relays exceeds 10 million units. ISO9001-2015 quality management certification, TUV certification, and CCC certification support product acceptance in global markets. Huajin supplies high current relays to EV charging infrastructure providers, industrial power supply manufacturers, and energy storage system integrators.
Specifications
| Parameter | Specification |
|---|---|
| Contact Configuration | 1A (SPST-NO), 2A (DPST-NO) |
| Contact Material | Silver Tin Oxide (AgSnO2) |
| Continuous Current Rating | 40A, 60A, 80A, 100A |
| Coil Voltage Options | 5V, 12V, 24V, 48V DC |
| Max. Switching Voltage (AC) | 440 VAC |
| Max. Switching Voltage (DC) | 300 VDC |
| Electrical Endurance | ≥ 10,000 operations at rated load |
| Mechanical Endurance | ≥ 1,000,000 operations |
| Coil Power Consumption | Approx. 1.5W – 3.0W (latching pulse) |
| Initial Contact Resistance | ≤ 5 mΩ (100A model) |
| Dielectric Strength | 4000 VAC (coil to contacts) |
| Operating Temperature | -40°C to +85°C |
| Safety Approvals | TUV, CCC, CE |
Applications
- EV DC fast-charging stations (power stage switching)
- Battery energy storage system (BESS) disconnection
- Industrial DC power supply switching
- Solar inverter DC disconnect
- High-power lighting and heating control
Advantages
- High continuous current capacity (40A–100A)
- Zero standby power consumption in latching design
- Low contact resistance (≤ 5 mΩ) minimizes power loss
- Bi-directional switching supports V2G and DC applications
- Arc-resistant contact chamber for reliable interruption
Frequently Asked Questions
What is the maximum continuous current these relays can handle?
Current ratings range from 40A to 100A depending on the model. The 100A version is suitable for high-power DC fast-charging applications, while the 40A model is typically used in residential AC wall box chargers.
Are these relays suitable for DC switching?
Yes. The relays are rated for DC interruption up to 300 VDC, with arc extinguishing mechanisms optimized for direct current switching in battery and charging applications.
How does magnetic latching benefit high current applications?
Magnetic latching eliminates coil power consumption during steady-state operation, reducing heat generation in the relay and surrounding components, which is critical for high current applications where thermal management is a concern.
What is the inrush current withstand capability?
The relay can withstand inrush currents up to 10 times the rated current for 10 milliseconds, making it suitable for capacitive loads such as battery pre-charge circuits and power supply input stages.
Material Selection Guide
- Contact Material — Silver Tin Oxide (AgSnO2): Provides anti-welding performance and arc resistance for high-current DC and AC switching applications. Maintains stable contact resistance across life.
- Contact Spring — Beryllium Copper or Stainless Steel: Provides stable contact pressure over temperature and life, ensuring low and consistent contact resistance.
- Housing — UL94 V-0 Flame-retardant Thermoplastics: Provides dielectric strength and mechanical robustness for high-power applications.
- Terminals — Copper with Silver Plating: Minimizes contact resistance and provides corrosion resistance for high-current connections.
Production and Customization Services
Huajin Technology offers customization for high current switching relays including current rating adjustments (40A–100A), coil voltage options (5–48 VDC), terminal configurations (PCB pin, quick-connect, bus bar), and contact material selection. We support prototyping and volume production with full electrical life testing and thermal characterization.
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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.
