A high voltage firing unit, comprising: a high voltage converter configured to generate a high voltage output signal from a lower voltage input signal, the lower voltage input signal being a first electronic safe arm, ESA, power signal from an external ordnance controller; a capacitive discharge unit operably coupled with the high voltage converter, the capacitive discharge unit configured to store energy from the high voltage output signal across an energy storage device, and to discharge energy from the energy storage device in response to a fire control signal; a control and monitoring unit operably coupled with the high voltage converter and the capacitive discharge unit, the control and monitoring unit configured to communicate with the external ordnance controller and control internal operations of the high voltage firing unit; and a plurality of safety switches (144, 146, 148) coupled in a path to the capacitive discharge unit on a lower voltage side of the high voltage converter that is electrically isolated from the capacitive discharge unit, wherein the plurality of safety switches (144, 146, 148) prevents charging of the energy storage device if any one of the plurality of safety switches (144, 146, 148) is disabled during a safe mode, wherein a first safety switch of the plurality of safety switches (144, 146, 148) is controllable by the control and monitoring unit to enable and disable the lower voltage input signal in the path to the capacitive discharge unit, and a second safety switch of the plurality of safety switches (144, 146, 148) is controllable by a second ESA power signal from the external ordnance controller. a high voltage converter configured to generate a high voltage output signal from a lower voltage input signal, the lower voltage input signal being a first electronic safe arm, ESA, power signal from an external ordnance controller; a capacitive discharge unit operably coupled with the high voltage converter, the capacitive discharge unit configured to store energy from the high voltage output signal across an energy storage device, and to discharge energy from the energy storage device in response to a fire control signal; a control and monitoring unit operably coupled with the high voltage converter and the capacitive discharge unit, the control and monitoring unit configured to communicate with the external ordnance controller and control internal operations of the high voltage firing unit; and a plurality of safety switches (144, 146, 148) coupled in a path to the capacitive discharge unit on a lower voltage side of the high voltage converter that is electrically isolated from the capacitive discharge unit, wherein the plurality of safety switches (144, 146, 148) prevents charging of the energy storage device if any one of the plurality of safety switches (144, 146, 148) is disabled during a safe mode, wherein a first safety switch of the plurality of safety switches (144, 146, 148) is controllable by the control and monitoring unit to enable and disable the lower voltage input signal in the path to the capacitive discharge unit, and a second safety switch of the plurality of safety switches (144, 146, 148) is controllable by a second ESA power signal from the external ordnance controller.