Holding contacts are typically wired in:

Holding contacts, also known as maintain contacts or auxiliary contacts, are typically wired in parallel with the start pushbutton in control circuits. This configuration allows for a continuous power supply to the coil of the relay or contactor after the initial activation by the pushbutton. When the pushbutton is pressed, it energizes the coil, closing the main contacts and allowing current to flow through the load.

As long as the holding contacts remain closed (thanks to the energized coil), power continues to flow through the circuit even after the pushbutton is released. This is essential for maintaining the operation of devices such as motors beyond the momentary action of a button press.

In contrast, configurations like series wiring would not allow the relay or contactor to remain energized once the pushbutton is released, which is not the desired effect in most control applications. Similarly, isolation from the control circuit would prevent any control operation from occurring, negating the purpose of using holding contacts.