Different Types of Circuit Breakers

Every circuit in your home or building is protected by a breaker, but not all breakers do the same job. Here are the three main categories used in residential and commercial electrical systems, and where each belongs.

Standard Circuit Breakers

Standard breakers are the general-purpose protection for most electrical loads. They watch the current on a circuit and trip when it exceeds the rating, protecting the wiring from overheating. They come in two varieties:

Single-Pole Breakers

A single-pole breaker protects a single energized wire and typically handles 15 to 20 amps on a 120V circuit. This is the breaker behind most lighting and outlet circuits in your home. They are available in full-size, half-size, and twin/tandem configurations depending on panel space.

Double-Pole Breakers

A double-pole breaker protects two energized wires at once, occupying two slots in the panel, and handles 15 to 200 amps on 120V or 240V circuits. Large appliances such as water heaters, dryers, ranges, AC units, and EV chargers require double-pole breakers.

GFCI Breakers (Ground Fault Circuit Interrupter)

A GFCI breaker interrupts power when it detects current leaking to ground, the kind of fault that happens when electricity finds a path through water or a person. Unlike a GFCI outlet, which protects one location, a GFCI breaker protects the entire circuit from the panel. They are recommended for wet and high-risk areas: patios, garages, kitchens, baths, and exterior circuits.

AFCI Breakers (Arc Fault Circuit Interrupter)

An AFCI breaker cuts power when it detects arcing, the abnormal current path created by damaged, pinched, or aging wiring. Arcs generate intense heat and are a leading cause of electrical fires. AFCIs are highly sensitive by design and are used in commercial, industrial, and residential settings, and modern code requires them on most living-area circuits in new work.

Which Breakers Does Your Panel Need?

It depends on the circuit, the location, and the code cycle your work falls under. If breakers in your panel are tripping repeatedly, that is the system telling you something: see our guide on electrical troubleshooting.

Leave Breaker Replacement to a Licensed Electrician

Swapping a breaker means working inside a live panel, and using the wrong breaker type or brand for your panel creates a fire risk that passes unnoticed for years. Fowler Electric replaces and upgrades breakers and panels across the Las Vegas Valley, licensed and insured (NV License #0079908 · NV License #0087194). Call 702-778-4346 or read about our panel upgrade services.