English
中文简体
русский
Overvoltage Protection
-- Steady & Reliable Manufacturer --
Introduction
Overvoltage protection relays are designed to disconnect electrical circuits when the supply voltage exceeds a preset threshold, protecting sensitive equipment from damage due to voltage surges, neutral faults, or grid disturbances. These relays monitor the AC or DC supply voltage and actuate a switch to isolate the load when the voltage rises above the trip level. The relays feature adjustable trip thresholds and time delays to differentiate between transient surges and sustained overvoltage conditions. Huajin's overvoltage protection relays incorporate magnetic latching technology for zero standby power consumption, making them suitable for continuous monitoring applications. The relays are available in single-phase and three-phase versions with voltage monitoring ranges up to 480 VAC. Contact ratings range from 10A to 30A, with electrical life of ≥ 50,000 operations.
Huajin Technology — Overvoltage Protection Relay Manufacturer
Huajin Technology Jiaxing Co., Ltd. manufactures overvoltage protection relays for industrial, commercial, and residential electrical systems. Established in 2021, the company operates an 8,000-square-meter facility in Jiaxing City with over 120 employees. Annual production capacity exceeds 10 million relays. ISO9001-2015 quality management certification, TUV certification, and CCC certification ensure product compliance for global markets. Huajin supplies overvoltage protection relays to panel builders, equipment manufacturers, and electrical contractors.
Specifications
| Parameter | Specification |
|---|---|
| Monitoring Voltage Range | 80V – 300V AC (single-phase) / 400V – 480V AC (three-phase) |
| Trip Threshold (Adjustable) | 110% – 130% of nominal voltage |
| Time Delay (Adjustable) | 0.1s – 10s |
| Contact Configuration | 1A or 1C |
| Contact Current Rating | 10A – 30A |
| Coil Voltage Options | 12V, 24V, 48V DC |
| Electrical Endurance | ≥ 50,000 operations at rated load |
| Mechanical Endurance | ≥ 1,000,000 operations |
| Voltage Measurement Accuracy | ± 1% of full scale |
| Operating Temperature | -25°C to +70°C |
| Safety Approvals | TUV, CCC, CE |
Applications
- Industrial equipment protection (motors, drives, PLCs)
- Commercial building electrical systems
- Residential surge protection panels
- HVAC equipment protection
- Medical equipment power protection
Advantages
- Adjustable trip threshold for application flexibility
- Adjustable time delay to avoid nuisance tripping
- Zero standby power consumption in latching design
- Wide voltage monitoring range (80V–480V AC)
- Single-phase and three-phase options
Frequently Asked Questions
What is the difference between overvoltage and surge protection?
Overvoltage protection relays respond to sustained voltage increases that persist for more than a few cycles, typically caused by neutral faults or grid regulation issues. Surge protectors (MOVs) respond to short-duration voltage spikes in microseconds. Both are often used together for comprehensive protection.
Can this relay differentiate between transient surges and sustained overvoltage?
Yes. The adjustable time delay allows the relay to ignore short-duration transients (typically < 100 ms) and only trip when the overvoltage condition persists beyond the set delay.
What is the trip accuracy of this relay?
Voltage measurement accuracy is ± 1% of full scale. The trip threshold is adjustable from 110% to 130% of the nominal voltage setting.
Are three-phase versions available?
Yes. Three-phase versions are available for 400V–480V systems, with monitoring on all phases and trip outputs available for individual phases or combined fault indication.
Material Selection Guide
- Contact Material — Silver Tin Oxide (AgSnO2): Provides reliable switching under AC load conditions with resistance to contact welding and arc erosion.
- Voltage Sensing Circuit — Precision Resistor Network: Provides accurate voltage measurement across the operating temperature range.
- Housing — UL94 V-0 Flame-retardant Thermoplastics: Provides dielectric strength and mechanical protection for panel mounting.
- Terminals — Brass with Tin Plating: Ensures reliable connections and corrosion resistance in electrical panels.
-
0+
Established in May 2021
-
0%
Annual exports account for about 30%
-
0㎡
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.
