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How to wire the delayed start function of the distribution box

To wire a delayed start function, connect a time delay relay to the power supply and use its normally open contacts to control the load via a contactor, setting the desired delay time.

Step-by-

Step Wiring Guide1.

Identify the Time Relay Terminals

Coil terminals (A1/A2 or 2/7): Connect to the AC power supply (commonly 220V) to energize the relay. Output contacts: Normally Open (NO) contacts (e.g., 1-3, 8-6 or 15-18) close after the delay to start the load. Normally Closed (NC) contacts (e.g., 1-4, 8-5 or 15-16) open after the delay for delayed stop applications.

2.

Connect the Coil to Power

Wire the relay coil terminals to the distribution box power supply. Ensure proper voltage matching (e.g., 220V AC). 3.

Connect the Load via a ContactorUse the NO contacts of the relay to control the coil of an AC contactor. The contactor then switches the main load, such as a motor or lighting circuit. For a simplified setup, a single set of NO contacts is sufficient to energize the contactor after the delay.

4.

Set the Delay Time

Adjust the time relay to the desired delay (e.g., 30 seconds for motor startup). The relay will start timing when power is applied, and the NO contacts will close after the set delay. 5.

Verify the Circuit

Ensure all connections are secure and insulated. Test the delayed start function by powering the distribution box and observing the load activation after the set delay.

Practical Tips

Sequential startup: Use delayed start to prevent high inrush currents when multiple devices start simultaneously. Safety: Always turn off the main power before wiring. Terminal labeling: Follow IEC or manufacturer-specific terminal numbers to avoid miswiring.

Optional control input: Some relays have an external start input (B1) for triggering the delay via a switch or pushbutton. By following these steps, you can implement a safe and reliable delayed start function in your distribution box, ensuring smooth startup of motors or other electrical loads while protecting the system from sudden current surges.

How to wire the delayed start function of the distribution box

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