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Breaker Panels, Breakers and Circuit Protection

Load centers, molded-case and miniature circuit breakers, GFCI devices and breaker accessories for protecting electrical circuits. 25 products from $1.85 to $653.99. Schneider Electric, SQUARE D BY SCHNEIDER ELECTRIC, Buyers Products Company and more.

25 products from $1.85

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Panel, breaker or protective device: what the circuit needs

This aisle holds the main parts of a distribution board. A load center, or breaker panel, is the enclosure and bus that feed the branch circuits. Circuit breakers snap into it, and each must be listed for that panel, because breakers from different families are not interchangeable even when they look alike. Molded-case breakers carry higher currents and are specified by pole count, such as 3-pole for three-phase, current in amps and voltage. GFCI devices detect leakage current and trip quickly to protect people near water.

Ratings to read: amps, voltage, poles and interrupting capacity

Four numbers matter on a breaker. The current rating, such as 30 A or 60 A, must not exceed what the protected wire can carry. The voltage rating, such as 525 V AC, must be at or above the system voltage. Pole count sets how many conductors trip together, and the interrupting rating must exceed the fault current available at the panel. Accessories such as shunt trips and lug kits are series-specific, so match the model printed on the breaker before choosing one.

Questions about Breaker Panels, Breakers and Circuit Protection

Can I use any brand of breaker in my panel?
No. A breaker must be listed for the panel it is installed in, and the panel's label names the permitted series. Look-alike breakers from other families may fit physically but can fail to connect properly to the bus or to trip as intended.
What does a shunt trip do?
A shunt trip is an accessory that lets a remote signal, such as an alarm or emergency stop, trip the breaker. It fits a compatible breaker series and needs its own control voltage, so check the coil voltage and the breaker model.
Can I replace a breaker myself?
Working in a live panel is hazardous, because the main lugs stay energized even with the main breaker off, and many regions require a licensed electrician. If you do the job, switch off the supply and use a breaker listed for your exact panel.