Pyrotechnic circuit breaker

A pyrotechnic circuit breaker comprising:

• a body,
• a piston slidably mounted in said body along a first direction, said piston having a first protrusion extending from a lower face thereof comprising a cutting edge,
• a pyrotechnic igniter adapted to propel said piston, and
• an electrically conductive bus bar extending in a second direction transverse to the first direction,
• wherein the piston is adapted to move from a first position corresponding to a raised position to a second position corresponding to a lowered position in order to cut the bus bar into two distinct portions upon activation of the pyrotechnic igniter,
• wherein the piston further comprises a second protrusion extending from the lower face of the piston over a greater distance than the first protrusion, and in that the bus bar comprises an aperture aligned along the first direction with said second protrusion, the second protrusion and the aperture being adapted to cooperate such that the second protrusion is engaged in the aperture when the piston moves from the first position to the second position.