Which devices are normally located in the safety switch just ahead of the starter?

• A. Relays
• B. Fuses or Circuit Breakers
• C. Contactors
• D. Voltmeters

Answer: (B)

The main idea is protecting and isolating the motor circuit. In a safety switch that sits in front of the starter, you’ll usually find fuses or a circuit breaker. These devices provide overcurrent protection for the motor and the wiring, and they also offer a means to disconnect power quickly if something goes wrong. Fuses cut off the circuit when current spikes, while a circuit breaker can trip or be reset after a fault, helping prevent damage to the starter, wiring, and motor.

Relays or contactors are part of the starter and control circuitry, not the protective switch itself, and voltmeters are measurement devices rather than protection or isolation devices.