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Which circuit protection do lighting circuits use?

  • A.Fuses rated for the circuit and the cable
  • B.A circuit breaker, which resets automatically and is therefore used for every lighting circuit on a vehicle
  • C.No protection
  • D.A relay with an integral thermal cut-out, which opens if the current exceeds the rating of the circuit protected

Answer: A

Blade fuses protect each lighting circuit and are chosen to protect the cable rather than the lamp. Thermal circuit breakers genuinely are used for headlamps on some vehicles so a fault does not extinguish them entirely, which makes the second option a real practice. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming what changes and what stays the same is the reliable route through questions of this shape.

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