This is a contactor holding circuit wiring diagram, commonly used for motor control or any application where a circuit needs to remain energized after a momentary pushbutton is released. Here's a breakdown of how this works: 👇
Components Involved:
Contactor (CJX2 5011) – Controls the main circuit.
Start Button (Green) – Normally Open (NO).
Stop Button (Red) – Normally Closed (NC).
Control Power Supply (MCB) – Provides control voltage (e.g., 230V AC).
Auxiliary Contact (NO) – On the contactor, used for holding.
Wiring Explanation:
Power Supply:
Phase (P) and Neutral 👎 are coming from the MCB.
Phase goes through the STOP button (NC), then to the START button (NO), and to the A2 coil terminal of the contactor.
Neutral is directly connected to A1.
Operation:
Pressing the START button completes the circuit momentarily.
This energizes the contactor coil, pulling in the contacts.
One of the NO auxiliary contacts of the contactor is wired in parallel with the START button – this is the holding contact.
Once the contactor is energized, the holding contact closes, maintaining the circuit even after the START button is released.
Pressing the STOP button breaks the circuit, de-energizing the coil, and the contactor drops out.
This is a classic latching or holding circuit used in automation. 👌
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