'C' curve MCB

[glen.mason]

A recurring problem I've found with halogen mains voltage down-lighters is that if 1 bulb blows it tends to take the whole circuit down and trip the MCB. There must be a millisecond of overcurrent sensed when the bulb decides to go 'belly up' trips the circuit. Would I be right in thinking that a C curve breaker would discriminate against this nuisance tripping?

 

[Adam W]

That's not what type C breakers are meant for.
Soldering a bit of wire directly to the busbar in place of the protective device would "discriminate against this nuisance tripping" but that's not to say you should do it.

 

[nickblake]

agree with novus , whats happening is the MCB is detecting a fault , the fault being the lamp going , what happens is the resistance of the filament is reduced and eventually gets to a short circuit hence the MCB trips common with all filament lamps , if the installation is wired in 1.5mm you could increase the size of the MCB to 10 amps that may cure the problem