MCB

How does an MCB work?

This excerpt from ABB introduces the technology inside and miniature circuit breaker (MCB). What does an MCB do? The short answer: it protects wires from overloads and short-circuits. When we look on the inside of an MCB we can see how that actually works. For overload protection the temperature of a bimetal, through which the current passes (yellow area), is decisive. If the nominal current—the current the circuit breaker is…

What is circuit protection?

Circuit protection, at its simplest, is the intentional addition of a ‘weak link’ in an electrical circuit. This link will be broken in the event of a fault – whether that’s high temperature, excessive current or a short circuit in a conductor, thus protecting the electrical circuit it’s part of from damage. Why are circuit protective devices important? Protective devices are important because they ensure that under fault conditions, a…