Description
The Littelfuse 202 is a 3-phase voltage monitoring relay designed to protect motors and industrial equipment operating on 190–480VAC systems. This microcontroller-based device continuously monitors all three phases to detect dangerous power conditions such as phase loss, phase reversal, undervoltage, overvoltage, and voltage unbalance. When an abnormal condition is detected, the output relay quickly de-energizes to protect equipment from damage and automatically restores operation once proper voltage conditions return. Its compact design, adjustable timing functions, and high-accuracy sensing make it ideal for HVAC systems, pumps, compressors, conveyors, and other critical motor-driven applications.
Key Features:
- 3-phase voltage monitoring relay
- Operating range: 190–480VAC, 50/60 Hz
- Detects phase loss, phase reversal, and voltage imbalance
- Overvoltage and undervoltage protection
- Adjustable trip delay and restart delay functions
- Microcontroller-based sensing for high accuracy
- Automatic reset after normal conditions return
- Ideal for motors, HVAC, and industrial automation systems
