Protection

Miniature Circuit Breaker

The over-current guard on every final circuit — trips when current exceeds its rating.

Photorealistic miniature circuit breaker
Real part — tap a marker

Miniature Circuit Breaker

The over-current guard on every final circuit — trips when current exceeds its rating.

Terminals
  • L-in (top)
  • L-out (bottom)
  • Fix aperture on top / Bottom DIN clip
  • Toggle lever — reset after a trip
  • Bimetal / thermal trip — slow overloads
  • Magnetic trip — fast short-circuits
  • Terminals — L-in (top) and L-out (bottom)
  • DIN-rail clip — snap onto the board
Cutaway of a miniature circuit breaker with the case sectioned away, showing the trip latch, magnetic coil, bimetal strip, arc chute, main contacts and terminal clamps
Cutaway — tap a marker
⚡ Meet it in a circuit

Terms used here

Defined in the glossary — each one opens at its own entry.

⚠ Safety note

Match the breaker to the cable: a 16 A MCB needs at least 1.5 mm² on a standard loop. Oversizing the breaker is how a cable melts before the trip.

More components
← Lamp / BulbOne-Way Switch →

Now wire it for real.

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