Main Breaker

Definition

The main electrical service protective device where the power enters a building.

Purpose

The main breaker serves as the primary disconnect switch for a building's electrical system, providing protection against overloads and short circuits. It allows for the entire power supply to be shut off for maintenance or in emergencies.

Examples of Use

• Residential homes: The main breaker in a home's electrical panel controls the power supply to all circuits.
• Commercial buildings: Centralized control of power supply for safety and maintenance purposes.
• Industrial facilities: Managing high electrical loads and providing a quick shutdown option in emergencies.

Related Terms

• Circuit Breaker: An automatic switch designed to protect an electrical circuit from damage caused by overcurrent or short circuit.
• Electrical Panel: A component of an electricity supply system that divides electrical power into subsidiary circuits.
• Fuse: A safety device that protects an electrical circuit by melting and breaking the circuit when the current exceeds a certain level.

Notes

• The main breaker must be properly sized and rated to handle the electrical load of the entire building.
• Regular inspection and maintenance are essential to ensure the main breaker operates correctly.
• Safety protocols should be followed when operating or servicing the main breaker to prevent electrical hazards.