Sentrol Industrial 381-BT Series DPST safety interlock switch is designed for use with safety monitored relays or monitored circuits. To achieve the optimum Series 300 defeat resistant feature of the Sentrol 381-BT, both the switch circuit and the tamper circuit must be connected. Mount the Sentrol switch on the stationary frame of the machine and mount the actuator on the moveable guard, door or gate. Keep the Sentrol switch and actuator within the listed sense range.

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