Apparatus for discharging a high-voltage bus

A power inverter electrically connected to a high-voltage DC power source via a high-voltage bus, the power inverter comprising:

• a multi-phase inverter circuit electrically connected to positive and negative conductors of the high-voltage bus;
• a bi-stable switch electrically connected in series with a discharge resistor between the positive and negative conductors of the high-voltage bus;
• a capacitor electrically connected between the positive and negative conductors of the high-voltage bus;
• first and second trigger circuits in communication with a gate of the bi-stable switch;
• first and second contactors being controllable to electrically connect a respective one of the positive and negative conductors of the high-voltage bus to the high-voltage DC power source, wherein the first and second contactors are in communication with a respective one of the first and second trigger circuits;
• wherein the bi-stable switch is controllable to provide a low-impedance electric current flow path through the discharge resistor between the positive and negative conductors of the high-voltage bus in response to an activation signal that is communicated from one of the first and second contactors to the bi-stable switch via one of the first and second trigger circuits.