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failing dimmer switches?

The lighting in my lounge consists of four double wall lights(ie.six lamps) controlled by a dimmer switch. Last year, after years of trouble free use, the dimmer switch failed. I replaced the switch and the first time a bulb blew the new unit failed. I have since fitted a further three switches and all have failed every time a bulb blows. The only change I have made is the use of halogen bulbs as the old iridescent type are not readily available, could this be the problem? I should add I use 6x 60 watt bulbs and the switch units were rated 400W.
ANDY MAN, January 2014
the back emf is whats killing the thyristors in the dimmer fit a 3 amp fuse inline with each dimmer or an in4007 diode

mm, January 2014