Initiator unit

A method of shunting an electronic initiator unit for the electrical firing of a charge in an energetic device, comprising:

• providing an actuation module comprising electrically in series a first conductor, an electronic actuator configured to initiate a charge of energetic material located in its vicinity on passage of an electric current, and a second conductor;
• providing an engagement module including a first electrical connector conductively connected to the first conductor and defining a first connector contact portion spaced remotely from the first conductor and a second electrical connector conductively connected to the second conductor and defining a second connector contact portion spaced remotely from the second conductor;
• providing a shunt module including a first shunt connector defining a first shunt contact portion, a second shunt connector defining a second shunt contact portion, and a conductive connection between the first and second shunt connector spaced remotely from the shunt contact portions;
• wherein the engagement module and the shunt module are co-operably configured so as to be engageable together such as to effect when so engaged an electrical connection between the first connector contact portion and the first shunt contact portion and between the second connector contact portion and the second shunt contact portion;
• engaging the engagement module and the shunt module together to effect a shunt connection.