TR-S-N/3 16-22 is the part number description for a Fuji Electric TR Series Thermal Overload Relay. It is an electrical safety device designed to protect low-voltage induction motors from overheating, overcurrent, and phase-loss failures.

Key Specifications & Features

1. Protection Mechanism: Employs factory-calibrated bimetal strips that bend and trip the circuit if the motor pulls too much current over a sustained period.
2. Reset Modes: Supports both manual and automatic resetting once the internal bimetal element cools down.
3. Auxiliary Contacts: Equipped with isolated 1 NO (Normally Open) + 1 NC (Normally Closed) contacts to trigger warning lights or kill control circuits when tripped.

Ambient Compensation: Designed to maintain trip accuracy regardless of external ambient temperature fluctuations.