Qp3-12a Wiring Diagram ((hot)) Jun 2026

Electrical work involving three-phase power can be fatal. When in doubt, hire a licensed electrician. Always de-energize the circuit before referencing or modifying any wiring based on a Qp3-12a wiring diagram.

Some Qp3-12a models can be configured for single-phase monitoring. In this mode, you ignore L3 or bridge L2-L3. The diagram changes significantly: Qp3-12a Wiring Diagram

Typically the pin on the left. The PTC (Positive Temperature Coefficient) element inside the relay briefly provides power to this pin to kickstart the motor. Electrical work involving three-phase power can be fatal

Think of the QP3-12A as a heavy-duty switch that is controlled by electricity. You cannot manually flip the switch; instead, you send a small electrical signal to the "coil." This coil creates a magnetic field that snaps the main contacts together, allowing high-voltage electricity to flow to your motor, heater, or lighting bank. Some Qp3-12a models can be configured for single-phase