Power contact fault clearing device

A system, comprising:

• a first pair of terminals adapted to be connected across a first set of switchable contacts;
• a second pair of terminals adapted to be connected across a second set of switchable contacts;
• an arc suppressor adapted to be coupled to the second set of switchable contacts;
• a current sensor configured to measure a power load current associated with a power load coupled to the second set of switchable contacts;
• a voltage sensor configured to measure contact voltage across the second set of switchable contacts;
• and
• a controller circuit operatively coupled to the current sensor, the voltage sensor, and the first and second pairs of terminals, the controller circuit configured to:
• detect a fault condition based on one or both of the power load current and the contact voltage;
• and
• sequence deactivation of the first set of switchable contacts and the second set of switchable contacts based on the detected fault condition,
• wherein the fault condition is based on a charge amount associated with the power load current, and to detect the fault condition the controller circuit is configured to determine the charge amount is greater than a preconfigured charge, threshold level.

An electrical circuit, comprising:

• a first pair of terminals adapted to be connected across a first set of switchable contacts;
• a second pair of terminals adapted to be connected across a second set of switchable contacts, the second set of switchable contacts coupled to an arc suppressor;
• a current sensor adapted to be connected between a power load and the second set of switchable contacts, the current sensor configured to measure a power load current associated with the power load;
• a voltage sensor adapted to be connected between the second set of switchable contacts and determine voltage across the second set of switchable contacts;
• and
• a controller circuit operatively coupled to the current sensor and the first and second pairs of terminals, the controller circuit configured to:
• detect a fault condition based at least on the power load current;
• and
• sequence deactivation of the first set of switchable contacts and the second set of switchable contacts based on the detected fault condition,
• wherein during the deactivation, the second set of switchable contacts is deactivated prior to deactivation of the first set of switchable contacts.