Littelfuse VM500 3-Phase Voltage Monitoring Relay
Littelfuse VM500 3-Phase Voltage Monitoring Relay protects 3- and 4-wire 415VAC 50Hz systems and can easily be mounted on a DIN rail for versatility. The VM500 relay monitors undervoltage, overvoltage, phase loss, phase sequence, phase asymmetry, and neutral failure conditions. Overvoltage and undervoltage trip thresholds can be adjusted, and the LED indicators provide clear visibility of faults. Littelfuse VM500 Relay is suitable for building systems, industrial machines, refrigeration, and water and waste applications.
Features
- 3-phase design
- Protects 3- and 4-wire 415VAC 50Hz systems
- Covers all key faults
- Configurable trip thresholds
- LED indicators provide fault visibility
Applications
- Water and waste
- Irrigation pumps
- Lift stations
- Cooling towers
- Automation panels
- Refrigeration and cooling
- Rooftop ACs
- Supermarket systems
- Building systems
- HVAC compressors
- Lifts
- Escalators
- Industrial machines
- Conveyors
- CNCs
- Packaging lines
Specifications
- 2 C/O relay outputs
- 5A contact rating
- 1x105 operation of electrical life
- 1x107 operation of mechanical life
- UL 94V-0 rated enclosure
- 90mm x 36mm x 60mm dimensions
- Base/DIN-rail mounting
- IP20 protection for terminals
- IP30 protection for housing
- -10°C to +60°C operating temperature range
LED Indications
Published: 2025-09-29
| Updated: 2025-10-15