Description
The Littelfuse 250A-MET delivers dependable, real-time protection for industrial motors and equipment operating on 190–480VAC three-phase systems. Powered by precision microcontroller-based sensing, this relay continuously monitors line voltage conditions and automatically de-energizes its output when a fault is detected — safeguarding connected equipment from costly damage caused by undervoltage, overvoltage, phase loss, phase imbalance, or reverse phase.
Adjustable trip and restart delay settings give technicians full control over system response, while automatic reset functionality restores normal operation as soon as healthy power conditions return. The Form C (DPDT) relay output ensures flexible integration into a wide range of control panel configurations, making this relay a go-to solution for protecting pumps, compressors, HVAC systems, conveyor equipment, and other motor-driven applications. Built-in LED diagnostics provide instant visual fault identification, reducing troubleshooting time and keeping systems running efficiently.
Key Features
- Microcontroller-based 3-phase voltage monitoring for high-accuracy fault detection
- Wide operating voltage range: 190–480VAC
- Form C (DPDT) relay output for versatile control panel integration
- Detects undervoltage, overvoltage, phase loss, phase reversal, and phase imbalance
- Adjustable trip delay and restart delay settings for customized system response
- Automatic reset upon restoration of normal power conditions
- LED indicators for fast, at-a-glance fault and status diagnostics
- Ideal for motors, compressors, pumps, HVAC systems, and industrial equipment protection
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