Molded Case Circuit Breaker

A Molded Case Circuit Breaker (MCCB) is a compact, ruggedized electrical safety device that protects circuits from overloads, short circuits, and faults. Housed in a molded insulating shell, MCCBs feature adjustable trip settings and higher interrupting capacities compared to standard MCBs.

MCCBs combine thermal and magnetic trip mechanisms—thermal elements react to prolonged overloads, while magnetic triggers respond instantly to short-circuits. This dual-action design ensures precise, dependable protection .

Common uses include power distribution panels, motor control centers (MCCs), HVAC systems, manufacturing lines, and emergency generator setups—anywhere circuit protection is needed.

While MCBs typically handle up to ~100 A, MCCBs cover a broader range (15 A to 3200 A), offer adjustable trip settings, and can interrupt much higher fault currents—ideal for industrial and heavy-duty use.

The product line includes WCM1, WCM5, WCM8, and WCM8E series. Frame ratings range from 63 A to 2000 A, voltage ratings up to 800 V, and breaking capacities between 20 kA and 100 kA .

Yes—MCCBs in specific frame classes (e.g., WCM4 for ≤400 A) can protect and switch motors, handling infrequent starts and trips under normal operation.

Absolutely. The line includes DC-rated MCCBs—such as WCM8E and WCM9Z—for solar and other DC applications up to 1500 V, offering fast overload and short-circuit protection.

Westhomes is a low/high-voltage specialist since 1998, serving major clients like State Grid & Southern Power Grid. We hold ISO, CE, and CCC certifications, with strong R&D, production output of 15M units/year, and 18‑month warranty on MCCBs.

Built to quality standards, all MCCB series—WCM1, WCM4, WCM5, WCM8—meet international performance and safety benchmarks.