Selec 642PSR, Phase Sequence Relays

642PSR Phase Sequence Relay, designed to ensure proper phase conditions and protect your electrical systems. This relay falls under the category of Phase Sequence Relays, offering essential features for monitoring and responding to phase-related issues.

The relay is expertly designed to measure Phase Sequence, Phase Failure, and Phase Asymmetry in a 3-phase, 3-wire electrical connection setup. With a quick Power On Delay of less than 500 milliseconds, it ensures that stable conditions are established before activating the circuit.

Voltage accuracy is a key feature, with ±1% accuracy of Full Scale, ensuring precise phase monitoring and response. The relay features a single C/O (SPDT) output contact, with NO (Normally Open) rating at 5A and NC (Normally Closed) rating at 3A, both at 250V AC.

Operating within an operating voltage range of 280V to 520V AC (Line to Line), the 642PSR Phase Sequence Relay ensures that your system operates within the specified phase conditions. Its compact 17.5mm size allows for easy DIN rail mounting.

Ensure the stability and health of your electrical system with the 642PSR Phase Sequence Relay, offering accurate and reliable phase monitoring and protection. It’s an indispensable component for maintaining the integrity of your electrical setup


Measuring Parameter Phase Sequence,Phase Failure, Phase Asymmetry
Electrical Connection 3P – 3W
Time Ranges Power On Delay :<500msec
Voltage Accuracy ±1% of Full Scale
Output Contact 1 C/O ( SPDT )
Output Rating NC:3A @ 250V AC , NO:5A @250V AC
Operating Voltage 280 To 520V AC (L-L)
Size 17.5mm
Mounting Type DIN Rail Mount

Additional information

Weight 1 kg

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