Adjustable Over/Under Voltage Protector Relay DC 12V–48V
Adjustable Over/Under Voltage Protector Relay DC 12V–48V
Adjustable Over/Under Voltage Protector Relay — DC 12V / 24V / 36V / 48V
Keep your DC electrical systems safe and running smoothly with this compact, DIN rail-mounted voltage protector relay. Designed for real-time monitoring of both overvoltage and undervoltage conditions on direct current circuits, this solid-state relay device automatically disconnects the load when voltage drifts outside your preset thresholds — then reconnects once stable voltage is restored. Both the trip thresholds and the action delay time are fully user-adjustable, giving you precise control over how your system responds.
Key Features
- Wide Voltage Compatibility: Works with DC 12V, DC 24V, DC 36V, and DC 48V circuits — ideal for solar, battery, and low-voltage industrial systems.
- Adjustable Overvoltage & Undervoltage Thresholds: Overvoltage adjustment range +8% to +42%; undervoltage adjustment range -17% to +17%.
- Adjustable Action Delay: Set the trip delay anywhere from 0.1 to 15 seconds to avoid nuisance tripping from momentary fluctuations.
- No Auxiliary Power Required: Powers directly from the monitored circuit — no separate supply needed.
- Solid State Relay Technology: Fast, reliable switching with no mechanical wear on the sensing circuit.
- 2 Sets of Output Contacts: Both normally open (NO) and normally closed (NC) contacts included for flexible wiring configurations.
- Dual LED Indicators: Two status LEDs clearly display current operating conditions at a glance.
- Standard DIN Rail Mount: Fits standard 35mm guide rails — integrates cleanly into existing enclosures and distribution boards.
- Compact Footprint: Slim 79 × 79 × 23 mm modular housing takes up minimal panel space.
Specifications
| Monitoring Circuit | Direct Current (DC) |
| Rated Voltage | DC 12V / DC 24V / DC 36V / DC 48V |
| Protection Function | Overvoltage & Undervoltage |
| Overvoltage Adjustment Range | +8% to +42% |
| Undervoltage Adjustment Range | -17% to +17% |
| Action Delay Range | 0.1 – 15 seconds |
| Contact Capacity | 6A / 250VAC (resistive load) |
| Relay Type | Solid State Relay |
| Installation | 35mm DIN Rail |
| Dimensions | 79 × 79 × 23 mm |
Common Applications
- Solar panel and battery storage systems
- 12V / 24V / 48V DC power distribution panels
- Industrial control cabinets and automation enclosures
- Electric vehicle charging and energy storage protection
- Telecom and off-grid power equipment
Package Includes
- 1× Over/Under Voltage Protector Relay
Made in Mainland China.
Note: Due to screen color calibration differences, the item's color may vary slightly from the images shown. Please allow ±1–3 cm measurement tolerance due to manual measurement.
For guidance on electrical safety standards for low-voltage devices, refer to the OSHA Electrical Safety Guidelines.
Frequently Asked Questions
Q: What DC voltage ratings does this voltage protector relay support?
A: This adjustable voltage protector relay is compatible with DC 12V, DC 24V, DC 36V, and DC 48V circuits. Make sure to select or configure the unit for the voltage level that matches your specific system before installation.
Q: Can I set both the overvoltage and undervoltage trip points independently?
A: Yes. The overvoltage threshold is independently adjustable from +8% to +42% above the rated voltage, while the undervoltage threshold can be set between -17% and +17% relative to the rated voltage. This gives you full, independent control over both protection limits.
Q: Does this relay require a separate auxiliary power supply?
A: No auxiliary power supply is needed. The relay draws its operating power directly from the monitored DC circuit, simplifying installation and reducing wiring complexity.
Q: What is the contact capacity of the output relay?
A: The output contacts are rated at 6A / 250VAC for resistive loads. There are 2 sets of contacts — one normally open (NO) and one normally closed (NC) — giving you flexibility for both energize-to-trip and de-energize-to-trip wiring schemes.
Q: How is this voltage protector relay installed?
A: The device uses a standard 35mm DIN rail mounting system, making it straightforward to snap into most industrial enclosures, distribution boards, or control cabinets. Its compact 79 × 79 × 23 mm footprint minimizes the panel space required.