A circuit breaker protects a circuit from overload and short circuit. Replacing one is about matching the electrical ratings exactly — and, for panel fit, usually the same brand and series.
The ratings that must match
- Current rating (amps): the trip rating — e.g. 16A, 32A, 100A.
- Poles: 1-pole, 2-pole, 3-pole or 4-pole.
- Voltage rating: matches your system (e.g. 240V, 480V AC; or a DC rating).
- Interrupting capacity (kA / AIC): the fault current it can safely break — must meet or exceed the original.
Trip characteristic
- For MCBs: trip curve B (resistive), C (general/mixed), or D (high inrush, motors).
- For MCCBs: thermal-magnetic or electronic trip, often adjustable, defined by a frame size.
Type and panel fit
Identify whether it's a DIN-rail MCB, a molded-case breaker (MCCB), or a panelboard breaker. Within a panel, breakers must usually be the same brand/series to fit the busbar and interlocks. Common makes: Schneider, ABB, Siemens, Eaton, Allen-Bradley.
We'll match it safely
Send us the part number (or amps, poles, voltage and kA), and we'll quote the correct breaker. When in doubt, never down-rate the interrupting capacity — match or exceed it.