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Smart Grid Solutions
-- Steady & Reliable Manufacturer --
Introduction
Relays for smart grid applications function as remote-controllable switches essential for distribution automation, load management, and fault isolation. These devices are integrated into distribution terminal units (DTU), feeder terminal units (FTU), smart meters, and capacitor bank controllers. They enable utilities to monitor and control electricity flow with precision. Huajin's smart grid relays feature high resistance to external magnetic interference (≥ 300 mT), ensuring measurement accuracy in meter applications. The magnetic latching mechanism supports battery-backed operation during grid outages, maintaining communication and control functions. Electrical life is rated at ≥ 100,000 operations at resistive load, with mechanical life exceeding 10,000,000 cycles for frequent switching commands from remote control centers.
Huajin Technology — Smart Grid Relay Supplier
Huajin Technology Jiaxing Co., Ltd. specializes in the R&D and production of magnetic latching relays for utility and industrial applications. With a registered capital of 10 million RMB and an 8,000-square-meter production facility, the company maintains an annual output of over 10 million relays. ISO9001-2015 quality management certification ensures consistent manufacturing processes, while CCC, TUV, and State Grid certifications validate product compliance for grid infrastructure projects. Huajin supplies smart grid relays to meter manufacturers, distribution equipment OEMs, and utility companies across China and export markets.
Specifications
| Parameter | Specification |
|---|---|
| Contact Form | 1C (SPDT), 2C (DPDT) |
| Contact Material | AgNi / AgSnO2 (gold-plated for signal) |
| Coil Voltage Options | 5V, 12V, 24V, 48V, 110V DC |
| Max. Switching Voltage | 250 VAC / 30 VDC (signal) / 440 VAC (power) |
| Max. Switching Current | Up to 16A (power) / 2A (signal) |
| Electrical Endurance | ≥ 100,000 operations at rated load |
| Mechanical Endurance | ≥ 10,000,000 operations |
| Coil Power (Latching) | Approx. 0.5W (set/reset pulse) |
| Insulation Resistance | ≥ 1000 MΩ at 500 VDC |
| Dielectric Strength | 1500 VAC (coil to contacts) |
| Anti-Magnetic Interference | ≥ 300 mT external field tolerance |
| Operating Temperature | -25°C to +70°C |
Applications
- Distribution automation terminals (DTU/FTU)
- Advanced metering infrastructure (AMI)
- Feeder automation and fault isolation
- Capacitor bank switching for power factor correction
- Demand response and load control
Advantages
- Anti-magnetic interference for tamper-proof metering
- Bi-stable mechanism eliminates steady-state power
- Wide control voltage compatibility
- High insulation for grid safety
- Proven performance in remote switching applications
Frequently Asked Questions
How does anti-magnetic interference benefit smart grid applications?
Anti-magnetic interference prevents the relay from being affected by external magnetic fields, ensuring stable contact states. This is critical for tamper-proof smart meters and reliable communication in grid automation systems.
What is the typical response time?
The typical response time for operation is 10–15 milliseconds, supporting fast automation sequences and real-time grid control commands.
Can these relays operate on battery backup?
Yes. The magnetic latching mechanism consumes power only during state transitions, making these relays suitable for battery-backed systems that require extended operation during grid outages.
Are these relays compatible with both AC and DC control circuits?
Yes. Coil options are available for both AC and DC control circuits, providing flexibility for integration into various grid automation equipment designs.
Material Selection Guide
- Contact Material — Silver Nickel (AgNi) or Silver Tin Oxide (AgSnO2): AgNi is preferred for general-purpose switching, while AgSnO2 is recommended for high-inrush and inductive loads. Gold plating is available for low-level signal switching.
- Housing — Flame-retardant Thermoplastics (PA66, PBT): UL94 V-0 rated materials provide dielectric strength and dimensional stability across temperature ranges.
- Magnetic Circuit — High Permeability Steel: Optimized for magnetic latching efficiency, reducing pulse energy requirements.
- Terminals — Copper Alloy with Tin or Silver Plating: Ensures low contact resistance and long-term solderability.
Production and Customization Services
Huajin provides complete manufacturing services for smart grid relays, from prototyping to mass production. Customization options include coil voltage and resistance, contact material selection, terminal configuration, and performance parameters (pick-up/drop-out voltage, release time). Our testing facility supports dielectric, insulation resistance, and endurance testing to comply with utility specifications. We also offer custom labeling and packaging for meter manufacturer requirements.
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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.
