US Patent 7205879 Chisel for a pyromechanical disconnecting device

The invention relates to a pyromechanical disconnecting device having a housing (2) in which an electrical conductor (3) is arranged, having a cutting plunger (5) and a cutting chisel (8) made of plastic arranged thereon for severing the electrical conductor (3), and having a pyrotechnic igniter (1) in which a pyrotechnic charge is arranged for driving the cutting plunger (5), the cutting chisel (8) having an edge that slides along a mating edge of the housing (2) or of a component (4) of the housing (2) when the cutting plunger (5) or the cutting chisel (8) is driven and when the electrical conductor (3) is severed.