AC MCB

An AC MCB, or Alternating Current Miniature Circuit Breaker, is a safety device used to automatically disconnect a circuit when it detects an overcurrent—like an overload or short circuit—in an AC electrical system. It helps prevent damage to equipment and reduces the risk of electrical fires.

The main difference lies in how they handle current. AC current flows in both directions, while DC flows in one. Because of that, AC MCBs are built to interrupt alternating current with arc-suppression systems suited for AC waveforms. DC MCBs need stronger arc-breaking capacity since DC arcs are harder to extinguish. So, you should always match the breaker type to your system—never use an AC MCB in a DC circuit.

Using an AC MCB in an AC system ensures proper protection. It’s designed to react quickly when abnormal current is detected, helping protect wiring, devices, and people from electrical hazards. It’s a simple and effective way to boost safety and system reliability.

Its main job is to cut off the power supply when it senses current beyond the safe limit. It prevents overheating, equipment damage, and potential fire risks by stopping the flow before the circuit can be harmed. Once the issue is fixed, it can be manually reset.

An AC MCB typically includes a thermal element (for overload protection), a magnetic coil (for short-circuit trips), contact points, an arc chute to extinguish sparks, and a manual switch. These parts work together to provide fast and reliable circuit protection.

AC MCBs are widely used in homes, offices, factories, and commercial buildings. They protect lighting circuits, outlets, HVAC units, and machinery from electrical faults. Anywhere there’s an AC power distribution system, you’ll likely find an MCB doing its job quietly in the background.

Yes, Westhomes is a direct manufacturer of AC miniature circuit breakers. All of our products are designed, produced, and tested in-house under strict ISO-certified quality systems. This allows us to ensure consistent product quality, fast lead times, and competitive factory pricing.

Absolutely. We provide full OEM and ODM support, including custom branding, labeling, packaging, and circuit breaker design based on your market or project requirements. Whether you’re a distributor or building your own brand, we can tailor MCBs to your specifications.

Yes. Our AC MCBs are available with various current ratings (6A–125A), breaking capacities (6kA/10kA), and tripping characteristics (B, C, D curves). We can also adjust voltage ratings, pole numbers, or mechanical designs to fit your application needs, subject to MOQ.

Lead times vary depending on order volume and customization, but standard models usually ship within 15–20 working days. For OEM/ODM orders, our team will confirm the schedule based on your customization details and quantity.

All breakers go through 100% routine testing before shipment, including thermal and magnetic tripping tests, insulation resistance, and mechanical life checks.