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The Chint Self-Resetting Over-Voltage & Under-Voltage Protector OUVR Series is a new type of intelligent protection electrical device. It can automatically cut off the circuit when over-voltage or under-voltage occurs in the line, and automatically reconnect the circuit once the voltage returns to normal.
Product Models
OUVR-1: As the basic model of this series, it adopts a modular standard design, available in pole configurations such as 1P+N and 3P+N, with rated current specifications including 32A, 40A, 50A, 63A, and 80A.
OUVR-2: An upgraded version of OUVR-1, it features compact size, built-in wires, high-altitude adaptability and wide temperature rise tolerance. It also comes in 1P+N and 3P+N pole types, with rated current specifications similar to OUVR-1.
OUVR-3: A digital display type over-voltage and under-voltage protector equipped with a voltage display function. It can show the line voltage in real time, enabling users to intuitively monitor the voltage status.
Product Features
Anti-malfunction: The protector will not trip when sudden transient over-voltage occurs in the line; it will not reconnect the circuit in case of voltage instability caused by poor contact or similar faults, or when power supply resumes abruptly after a sudden outage.
Reliable operation: The protection operates with an inverse time-lag characteristic, with an operating time ≤ 1 second.
Wide voltage protection range: The voltage protection range is 0-450V. The protector itself will not be damaged even when the line fault voltage reaches the maximum level.
Surge voltage withstanding capacity: It can withstand a 4kV surge voltage, complying with the safety standards for Class III electrical appliances.
Status indication: The protector is equipped with LED indicators to show its working status. The green light indicates normal voltage, while the red light indicates over-voltage or under-voltage conditions.
Easy installation: With a modular design, it is mounted on a DIN rail, allowing convenient installation inside distribution boxes.
Technical Parameters
Taking OUVR-1 as an example, its over-voltage tripping value is 270V±5V, under-voltage tripping value is 170V±5V, over-voltage recovery value ranges from 240V to 260V, under-voltage recovery value ranges from 185V to 195V, and the self-reset delay time is 30s±10s.
Scope of Application
It is suitable for users or loads with an AC voltage of 230/400V, a frequency of 50Hz, and a rated operating current of 80A or below. It is mainly used in residential sub-distribution boxes or other distribution lines requiring protection, and can prevent accidents caused by abnormal voltage supplied to terminal electrical appliances.
Dimensions & Installation
Dimensions: The 1P+N version of the OUVR-2 series only occupies 27mm of space, and the 3P+N version takes up 54mm. Its compact size saves installation space.
Installation method: It is installed on TH35-7.5 steel mounting rails, with the inclination angle between the mounting surface and the vertical plane not exceeding 5°.
Application Scenarios of Chint OUVR Series Self-Resetting Over-Voltage & Under-Voltage Protector
The Chint OUVR Series (the term “QUERYVR” mentioned by the user is a misnomer) is an intelligent over-voltage and under-voltage protection device. It is mainly applicable to users or loads with an AC voltage of 230/400V, a frequency of 50Hz, and a rated operating current ≤ 80A. It can quickly cut off the circuit during over-voltage/under-voltage events and automatically reset when the voltage returns to normal, making it ideal for unattended scenarios. Below are detailed application scenarios and boundary specifications:
- Basic Application Conditions (Mandatory Requirements)
| Parameter Item | Specification Requirements | Remarks |
| Voltage Range | 230V/400V (Single-phase/Three-phase) | Suitable for household and small commercial power grids |
| Frequency | 50Hz | Standard power frequency grid |
| Rated Current | ≤ 80A | Covering specifications such as 32A, 40A, 50A, 63A, and 80A |
| Installation Environment | Dry, free of flammable and explosive gases, no condensation | Prohibited for use in humid, corrosive, or dusty environments |
| Mounting Method | TH35-7.5 steel DIN rail | Standard installation position in distribution boxes, inclination ≤ 5° |
- Core Application Scenarios
- Residential Sub-distribution Boxes (Most Mainstream)
Application Objective: Protect the main household circuit and terminal electrical appliances (refrigerators, air conditioners, TVs, smart home devices, etc.)
Pain Points Solved:
– Electrical appliance damage caused by grid fluctuations (e.g., lightning strikes, transformer failures)
– Abnormal operation of electrical appliances due to unstable power supply in old residential communities
– Damage from surge when power resumes abruptly after an outage (equipped with anti-reconnection function)
Recommended Models: OUVR-1/2 (1P+N) for single-phase household entry, OUVR-1/2 (3P+N) for three-phase villas
- Distribution Lines in Public Buildings
| Building Type | Specific Application Location | Protection Value |
|---|---|---|
| Office Buildings/Apartments | Floor distribution boxes, public lighting circuits | Ensure stable operation of office equipment and public lighting |
| Shops/Convenience Stores | Cash register systems, cold chain equipment, lighting | Avoid business interruption caused by abnormal voltage |
| Schools/Hospitals | Front-end of laboratory equipment and medical instruments | Prevent damage to precision equipment due to voltage fluctuations |
| Small Factories | Control circuits, auxiliary equipment | Protect weak current equipment such as PLCs and sensors |
- Special Protection for Specific Loads
Sensitive electronic devices: Computers, servers, monitoring systems, preventing motherboard/power supply breakdown due to over-voltage
Continuous operation equipment: Refrigerators, freezers, water pumps, avoiding motor burnout caused by under-voltage
Smart home systems: Gateways, smart switches, security devices, ensuring continuous system operation
Building supporting facilities: Lighting, ventilation, heating, water supply systems, compatible with the high-altitude and wide temperature rise characteristics of the OUVR-2 series
III. Scenario Adaptation Differences by Model
| Model | Core Features | Optimal Application Scenarios |
| OUVR-1 | Basic version, compact size | Sub-distribution boxes of ordinary residences and old residential communities |
| OUVR-2 | Upgraded version, built-in wires, suitable for high-altitude environments | Newly renovated residences, high-rise/super high-rise apartments, buildings in plateau areas |
| OUVR-3 | Digital display version, real-time voltage display | Laboratories, computer rooms, and precision equipment scenarios sensitive to voltage |
| OUVR-5 | Enhanced version, stronger surge resistance | Critical loads in areas with frequent lightning strikes and unstable power grids |
- Extended Application Scenarios (Requiring Matching Selection)
- Photovoltaic/Energy Storage Systems
Application Position: Protection at the output end of inverters before grid connection
Core Function: Prevent inverter damage caused by over-voltage from photovoltaic panels (e.g., under strong sunlight on sunny days) or grid voltage loss
Selection Key Points: Must match the output voltage and current of the inverter; the OUVR-5 series is recommended (withstanding 4kV surge voltage, complying with Class III electrical appliance standards)
- Front-end of Small Charging Piles
Protection Target: Electric vehicle charging guns and charging controllers
Problem Solved: Charging module failures caused by grid fluctuations, avoiding charging interruptions or damage to vehicle batteries
Note: Must be used in conjunction with dedicated residual current protectors for charging piles; it cannot replace surge protection devices (SPDs)
- Non-Applicable Scenarios (Clear Boundaries)
- Industrial heavy-load scenarios: Motors, frequency converters, welding machines with rated current > 80A (industrial-grade over-voltage and under-voltage protectors are required)
- Flammable and explosive environments: Gas stations, chemical workshops, coal mines, etc. (violates safety regulations)
- DC circuits: The OUVR series is only suitable for AC circuits; dedicated DC over-voltage and under-voltage protection devices are required for DC systems
- Core lightning protection: Cannot replace SPDs; they must be used together to handle instantaneous lightning-induced over-voltage
- Scenario Selection Quick Reference Table
| Scenario | Recommended Model | Pole Configuration | Rated Current | Installation Tips |
|---|---|---|---|---|
| Ordinary Residence (Single-phase) | OUVR-1/2 | 1P+N | 40A/63A | Install after the household main switch |
| Villa (Three-phase) | OUVR-1/2 | 3P+N | 63A/80A | Suitable for three-phase household entry distribution boxes |
| Shop/Convenience Store | OUVR-2 | 1P+N | 50A/63A | Built-in wires for easy installation |
| Computer Room/Laboratory | OUVR-3 | 1P+N/3P+N | 32A/40A | Digital display for real-time voltage monitoring |
| Residence in Lightning-prone Area | OUVR-5 | 1P+N/3P+N | 40A/63A | Enhanced surge resistance |
VII. Installation & Usage Recommendations
- Wiring Specifications: Strictly distinguish between the neutral (N) pole and phase lines; the N pole must be correctly connected with reliable wiring.
- Matching Devices: It is recommended to install a circuit breaker (e.g., Chint DZ47 series) at the front end, and connect loads at the rear end, forming a protection chain of “circuit breaker + OUVR + load”.
- Maintenance Tips: Regularly check the LED status indicators (green = normal, red = over-voltage/under-voltage) to ensure the protection function is effective.
