Igniter for seismic prospecting, mining applications or use in the crude oil or natural gas industries, with a detonator in which an explosive, an ignition element and internal wires for initiating the ignition element are arranged, wherein the internal wires lead into a plug which is located at one end of the detonator, characterised in that the plug is a multifunction plug, and a) has a plug base body and a plug cover which is displaceable inside the plug base body, wherein the plug cover can be shifted from a first actuating stage to a second actuating stage, b) routing channels are arranged inside the plug base body for the introduction of external wires, c) pressure plungers (10a, 10b, 10c, 10d) are arranged on the plug cover, which do not protrude into the routing channels in the first actuating stage, but in the second actuating stage do protrude into the routing channels, and shift an external wire introduced therein perpendicularly to the routing channels, d) a slot-shaped cutting contact protrudes into each of the routing channels, wherein the cutting contacts are connected to the internal wires, and in the second actuating stage the pressure plungers (10a, 10b, 10c, 10d) force the external wires into the cutting contacts in such manner that the cutting contacts strip the insulation from the external wires and create an electrical connection between said external wires and the internal wires, wherein a short-circuit bridge is arranged inside the plug base body, which bridge short-circuits the internal wires and/or the associated cutting contacts in the first actuating stage, and in the second actuating stage a short-circuit plunger arranged on the plug cover disconnects the short-circuit bridge from the internal wires and/or the associated cutting contacts and cancels the short-circuit, wherein the short-circuit bridge is spring-loaded or is a spring element which in the second actuating stage is pressed away from the electrical contact against its spring force by the short-circuit plunger. a) has a plug base body and a plug cover which is displaceable inside the plug base body, wherein the plug cover can be shifted from a first actuating stage to a second actuating stage, b) routing channels are arranged inside the plug base body for the introduction of external wires, c) pressure plungers (10a, 10b, 10c, 10d) are arranged on the plug cover, which do not protrude into the routing channels in the first actuating stage, but in the second actuating stage do protrude into the routing channels, and shift an external wire introduced therein perpendicularly to the routing channels, d) a slot-shaped cutting contact protrudes into each of the routing channels, wherein the cutting contacts are connected to the internal wires, and in the second actuating stage the pressure plungers (10a, 10b, 10c, 10d) force the external wires into the cutting contacts in such manner that the cutting contacts strip the insulation from the external wires and create an electrical connection between said external wires and the internal wires, wherein a short-circuit bridge is arranged inside the plug base body, which bridge short-circuits the internal wires and/or the associated cutting contacts in the first actuating stage, and in the second actuating stage a short-circuit plunger arranged on the plug cover disconnects the short-circuit bridge from the internal wires and/or the associated cutting contacts and cancels the short-circuit, wherein the short-circuit bridge is spring-loaded or is a spring element which in the second actuating stage is pressed away from the electrical contact against its spring force by the short-circuit plunger.