24V Contactor - Contactors & Overloads - Product Guides 24V Contactors 24V contactors are often used in HVAC and air compressor applications, and can have DC, AC, or DC/AC coils. Your choice of coil voltage depends on what kind of power supply you have available for the control circuit powering your contactor. How to Wire a Contactor: 13 Steps (with Pictures) - wikiHow Nov 01, 2019How to Wire a Contactor. Many large pieces of equipment require a high voltage current to operate. The standard current in a home is only 120 volts AC, so electricians use a contactor to increase the current. To use one, plug in the wires..Views: 281K1. Select a contactor that capable of handling the voltage and current. Contactors come with a built-in magnetic coil used to conduct electricity..2. Read the user manual to identify the outlets on the contactor. The input slots are labeled on most contactors, but check the manual for more inf..3. Check for a separate auxiliary output contact on the contactor. Some contactors have an extra set of slots labeled with the letter A. These auxi..4. Turn off the electricity before handling the wiring. Head down to the lowest floor of your home to find the circuit breaker or fuse box. It is u..