220V 16A Din Rail Adjustable Over & Under Voltage Protector Relay
220V 16A Din Rail Adjustable Over & Under Voltage Protector Relay
220V 16A Digital Display Din Rail Adjustable Over & Under Voltage Protector Relay
Keep your appliances and electrical equipment safe from damaging voltage fluctuations with this 220V 16A Din Rail Adjustable Voltage Protector Relay. Featuring a clear digital display and fully adjustable trip thresholds, this device automatically disconnects your load when voltage rises above or drops below your set limits — then reconnects automatically once stable voltage is restored. Ideal for home circuits, industrial panels, HVAC systems, refrigerators, pumps, and more.
Key Features
- Digital Display: Real-time voltage readout for at-a-glance monitoring directly on the Din rail panel.
- Adjustable Overvoltage & Undervoltage Thresholds: Set the overvoltage trip point anywhere from 230V–300V, and undervoltage from 140V–210V to match your equipment's requirements.
- Automatic Recovery: Configurable reconnect/start delay of 1–30 seconds ensures safe, automatic restoration of power once voltage stabilizes.
- Wide Operating Range: Functions across AC 80V–400V, making it versatile for varying supply conditions.
- Fast Trip Response: 0.5-second trip delay minimizes exposure to damaging voltage events.
- Standard Din Rail Mount: Snaps easily onto standard DIN rail for quick, clean panel installation.
- 1.5P Design with Power Meter Function: Compact form factor integrates basic power metering alongside protection.
- Broad Temperature Tolerance: Operates reliably from -50°C to 55°C, suitable for harsh environments.
Specifications
| Rated Supply Voltage | AC 220V / 50–60 Hz |
| Operating Voltage Range | AC 80V – 400V |
| Overvoltage (>U) Setting Range | 230V – 300V |
| Undervoltage (<U) Setting Range | 140V – 210V |
| Measurement Error | ±2% |
| Trip Delay (>U and <U) | 0.5 seconds |
| Reset / Start Delay | 1 – 30 seconds (adjustable) |
| Rated Insulation Voltage | 400V |
| Output Contact | 1 NO (Normally Open) |
| Rated Current | 16A |
| Operating Temperature | -50°C to 55°C |
| Humidity | ≤50% at 40°C |
| Storage Temperature | -30°C to 70°C |
| Country of Origin | Made in Mainland China |
What's in the Box
- 1× 220V 16A Din Rail Over & Under Voltage Protector Relay
Important Notes
- Due to screen calibration differences, actual product color may vary slightly from images.
- Please allow a 1mm–1cm tolerance due to manual measurement.
- Installation should be performed by a qualified electrician in accordance with local electrical codes.
For guidance on safe electrical installation practices, refer to the OSHA Electrical Safety Guidelines.
Frequently Asked Questions
Q: What does an over and under voltage protector relay do?
A: A voltage protector relay continuously monitors the incoming AC supply voltage. If the voltage rises above the set overvoltage threshold (e.g., above 230V–300V) or drops below the undervoltage threshold (e.g., below 140V–210V), the relay automatically trips and disconnects the load within 0.5 seconds. Once stable voltage is restored, the relay reconnects automatically after the configured delay — helping safeguard connected appliances and equipment from voltage fluctuation damage.
Q: How do I install this voltage protector on a DIN rail panel?
A: This unit is designed for standard DIN rail mounting. Simply clip the device onto your DIN rail inside your electrical panel, connect the incoming AC line through the device terminals, and wire the output to your load. Set your desired over and under voltage thresholds using the adjustment controls on the front. Always have installation performed by a licensed electrician and follow local electrical codes.
Q: Can I adjust the reconnect delay time on this voltage protector relay?
A: Yes. The reset/start delay is fully adjustable between 1 and 30 seconds. This allows you to customise how long the device waits after detecting stable voltage before automatically reconnecting power to the load, providing an added layer of protection for sensitive equipment like compressors and motors.
Q: What current and voltage rating is this protector suitable for?
A: This unit is rated for AC 220V / 50–60 Hz at up to 16A. Its operating voltage range spans AC 80V–400V, and the insulation voltage rating is 400V, making it compatible with most single-phase residential and light commercial electrical installations.