Wiring Motor Protection Relay. Overload relays protect the motor. Pin s 8 6 as normally open pin s 8 5 as normally closed.
See my switch terminology page for more on contact arrangements if you need to. Rtd and ptc based thermal protection connect as many as ten resistance temperature detectors rtds directly to the relay s optional rtd input card to monitor stator winding bearing ambient or other motor operating temperatures. Internal protection built into the motor why have built in motor protection when the motor is already fitted with overload relays and fuses.
Step by step guide how to wire contactor and motor protection switch.
For example an overload relay can trip without a circuit breaker tripping. Our bulletin 193 592 e300 networked and e200 non networked electronic overload relays are the newest technologies for overload protection. More specifically circuit breakers and fuses are designed to detect when there is too much current in the circuit while overload relays are designed to detect if a motor is overheating and will open the circuit if the motor gets too hot. Features include broken rotor bar detection and variable frequency drive vfd support as well as options for arc flash detection afd differential protection and synchronous motor protection.
