Thermal magnetic circuit breakers
Thermal magnetic circuit breakers, which are the type found in most distribution boards, incorporate both techniques with the electromagnet responding instantaneously to large surges in current (short circuits) and the bimetallic strip responding to less extreme but longer-term over-current conditions.
Circuit breakers protect cables and lines against the effects of overload currents and short circuits. They provide reliable protection for buildings, systems, and in particular people.
The thermal portion of the circuit breaker provides a time response feature, that trips the circuit breaker sooner for larger overcurrents but allows smaller overloads to persist for a longer time.
This allows short current spikes such as are produced when a motor or other non-resistive load is switched on.
With very large over-currents during a short-circuit, the magnetic element trips the circuit breaker with no intentional additional delay.
Damaged electrical equipment
Animals caused short circuit for example: Lizard, Cockroach, Rat, etc...
Human caused short circuit or getting electrocuted, child playing or putting their figures in socket
• Safe operability, particularly for non-professionals
• No maintenance
• High reliability
• High switching frequencies
• Single-pole or multi-pole (all-pole) protection and switching
• Automatic disconnection in case of overload or short circuit
• Safe disconnection independent of the handle position (trip-free)
• Safe (fast) current-limiting disconnection of short circuits,
• Best selectivity and/or backup protection prerequisites
• Greatest possible damage limitation (short circuit cannot develop its full power)