Breaker, Main

Definition

A main breaker is a switch in a main electrical service panel where the two hot service wires attach.

Purpose

The main breaker controls the overall power supply to a building or structure, providing a means to shut off all electricity in case of an emergency or for maintenance purposes. It also protects the entire electrical system from overloads and faults.

Examples of Use

1. Residential Homes: The main breaker in a home electrical panel can shut off power to the entire house.
2. Commercial Buildings: Main breakers are used to control power supply to large buildings, ensuring safety during maintenance or emergencies.
3. Industrial Facilities: Main breakers handle high power loads, protecting complex electrical systems in factories and plants.

Related Terms

• Subpanel: A secondary electrical panel that extends the circuit capacity from the main panel.
• Service Entrance: The point where the electrical service enters the building and connects to the main breaker.
• Load Center: Another term for the main electrical panel housing the main breaker and circuit breakers.

Notes

The main breaker is a critical component of an electrical system, and its proper functioning is vital for safety. Always ensure that the main breaker is accessible and clearly labeled.