Does a 20-amp circuit breaker protect electrical workers from electric shock?

• A. Yes, it protects workers
• B. No, it protects equipment only
• C. It protects both workers and equipment
• D. It depends on the circuit

Answer: (B)

Circuit breakers are overcurrent protection devices designed to interrupt excessive current to protect the wiring and equipment from damage and reduce fire risk. They trip when current goes beyond their rating, but they’re not a device meant to prevent electric shock to a person. A worker could still be harmed if they touch a live part before the breaker trips, or if the fault conditions don’t produce enough current to trigger a rapid interruption. For personal protection, you rely on de-energizing the circuit, lockout/tagout, proper insulation and PPE, and devices specifically for ground-fault protection like GFCIs that detect leakage to ground. So a 20-amp circuit breaker protects equipment, not workers.