Transformers designed for use on remote control switching systems supply which voltage?

Transformers designed for use on remote control switching systems supply which voltage?

• A. 120VAC
• B. 12VDC
• C. 24VAC
• D. 48VDC

Answer: (C)

Transformers for remote control switching systems provide a low, safe control power that also isolates the control circuitry from line voltage. The standard control voltage used to energize relays and contactors is 24 volts AC, because many control coils are designed for 24 VAC and it offers a good balance of safety, practicality, and reliability. Since the transformer output is AC, it directly suits these AC coils without additional rectification. If DC were needed, it would require a rectifier, but the common practice is to use 24 VAC right from the transformer. The other options are line voltage or DC voltages that don’t match the typical control-coil requirements.

Transformers for remote control switching systems provide a low, safe control power that also isolates the control circuitry from line voltage. The standard control voltage used to energize relays and contactors is 24 volts AC, because many control coils are designed for 24 VAC and it offers a good balance of safety, practicality, and reliability. Since the transformer output is AC, it directly suits these AC coils without additional rectification. If DC were needed, it would require a rectifier, but the common practice is to use 24 VAC right from the transformer. The other options are line voltage or DC voltages that don’t match the typical control-coil requirements.