🔍 Key Concepts

• Overcurrent protection purpose in electrical systems • How aging, wear, and mechanical parts affect breaker performance over time • Difference between tripping characteristics vs. voltage or interrupting ratings

💭 Think About

• Ask yourself: What is the MAIN job of a circuit breaker in terms of protecting circuits and equipment? • Which option describes something that must remain TRUE over the life of the breaker, not something that should change? • Which choices confuse the breaker’s rating (what it’s built to handle) with the purpose of periodic testing (what we are checking over time)?

✅ Before You Answer

• Verify which option focuses on maintaining safe protective performance as time passes • Eliminate any option that suggests the breaker should improve or change its designed characteristics with age • Check which distractors talk about voltage rating or interrupting capacity, which are design specifications, not usually the reason for routine periodic testing