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S7. Why does the MCB on the Dimmer Trip sometimes when a lamp fuses.

  1. Fusing of Tungsten Halogen Studio and Theatre Lamps
  2. A lamp normally fails at end of Life by fusing of filament. Often an arc then forms and as there is little resistance to limit the  current, this rises to a very high value which if maintained can result in a serious overload.
  3. A quick acting high breaking capacity MCB or fuse connected in the supply line of the dimmer disconnects the supply when this occurs