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It is typically a 3-pole device with built-in compensation for ambient temperature variations.
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Designed for protection against single-phase operation (phase failure).
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It includes built-in auxiliary contacts: typically one normally open (N.O.) and one normally closed (N.C.) contact for signaling and control circuit integration.
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The relay comes with manual and automatic reset options and test functions.
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It is intended for close coupled mounting with compatible ABB contactors (such as the A Line series).
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The relay has a thermal bimetal element that heats up with motor current; if overheating occurs, the bimetal bends to trip and disconnect the motor.
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It provides trip indication and can have a remote trip and reset option available.
