This monitoring relay from RS PRO trips a circuit breaker when the voltage supply drops too low or exceeds a certain level. It's used to prevent damage to equipment in the event of abnormal voltage conditions.
The microprocessor-based relay has red and green LED lights that allow you to clearly see the relay and supply status. To ensure safe operation, it senses undervoltage ranging from 173 V to 218 V and overvoltage ranging from 242 V to 288 V. It also allows for a time delay adjustment to prevent tripping from temporary dips in voltage.

• SPDT (Single Pole Double Throw) contact configuration
• Dimensions of 66.5 (length) x 17.5 (width) x 89 mm (height)
• One phase
• Frequency sensing range of 48 to 63 Hz
• DIN rail mounting type
• One pole
• Operating temperature range of -20°C to +60°C
• Special features include two LEDs to indicate operational states, adjustment for time delay, adjustment for undervoltage trip level, microprocessor-based relay, monitoring of own supply to detect if it exceeds the set under or overvoltage trip levels, true RMS (rotronic monitoring system) monitoring
• Meets CE, EMC (electromagnetic compatibility), EN 61000-6 and IEC standards
• Supply voltage of 230 V AC
• Screw terminal type
• Time delay of 0.2 to 10 s