thermal overload relay
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COMMON QUESTIONS
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We offer thermal overload relays compatible with CJX2 contactor series, available in current ranges from 0.1A to 95A with phase loss sensitivity and manual/auto reset options.
It monitors motor current through bimetallic strips that heat proportionally. When current exceeds the set threshold, the strips deflect and trip auxiliary contacts, disconnecting the motor before thermal damage occurs.
Select based on motor full-load current (FLC) and set the relay to match. For motors with service factor ≥1.15, set at FLC. For service factor <1.15, set at 0.9x FLC per NEC requirements.
Phase loss protection is a differential mechanism that trips the relay faster when one phase is lost (single-phasing), preventing motor burnout during unbalanced operation.
Yes, our thermal overload relays feature a selector switch for manual reset (recommended for safety) or automatic reset after cooling. Manual reset requires operator intervention before restart.
Yes, they feature direct mounting to CJX2 contactor series terminals, forming a compact motor starter assembly. Separate DIN rail mount adapters are also available.
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