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PHASE FAILURE / SEQUENCE RELAY
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PHASE FAILURE / SEQUENCE RELAY
Product catalog summary
Overview: The document describes the KRM72x phase failure/sequence relay, which monitors three-phase AC supplies for incorrect phase sequence, phase failure, and phase imbalance in systems up to 500V.
Specifications:
- Monitored Voltage: KRM721 (100-120V), KRM722 (200-240V), KRM725 (380-500V)
- Frequency: 50, 60, or 50/60Hz
- Contact Rating: AC: 100VA - 250V/2A max; DC: 50W - 100V/1A max
- Sensitivity Adjustment: 5-50%
- Fixed Delay: 2 seconds
- Operating Temperature: -10 to +60ºC
- Weight: 0.4 kg
- Front Protection: IP41
Functionality: The relay is designed to energize when the phase sequence is correct and all three phases are balanced. It includes a sensitivity adjustment feature to prevent nuisance tripping due to normal voltage variations. A factory-set delay of approximately two seconds is included to prevent tripping due to transients.
Compliance: The unit complies with IEC60092-504 and relevant environmental and EMC tests specified in IEC60068/60092 and IEC61000/60533, meeting the requirements of major Classification Societies.
Testing and Monitoring: Trip level and current imbalance can be monitored using a high impedance multi-meter on specified terminals. The DC voltage between terminals indicates the set trip level and monitored level, adjustable via the sensitivity potentiometer.
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