MCBs are categorized based on trip curves, which represent their response time to overcurrent: Type B (quick trip for residential use), Type C (medium trip for commercial applications), and Type D (slow trip for industrial uses with high inrush currents).

While MCBs primarily protect against overcurrent and short circuits, they don’t offer direct protection against electric shocks. For shock protection, one would need a Residual Current Circuit Breaker (RCCB) or Ground Fault Circuit Interrupter (GFCI).

Always ensure the MCB is of the correct rating for your circuit. Periodically inspect for signs of wear or damage. Do not force a tripped MCB to stay on, and always consult professionals for installation or troubleshooting.

Small appliances such as microwave ovens, electric iron and electric kettles don’t require an isolation switch when maintenance is done. Air conditioners, refrigerators and exhaust fans need an isolation switch to ease the challenges associated with maintenance and repairs.

In higher voltage environments, both circuit breakers and electrical isolators are used. A circuit breaker cuts off the current to the whole circuit and the latter then isolates a section during servicing. Both are needed for ensuring electrical safety.

Unlike a circuit breaker, an electrical isolator does not have an arc control system. It can be used only during offload conditions.