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Current Interrupter - Any device that will open a circuit after sensing an abnormal high-circuit condition; a general name given to all types of fuses, reclosers and breakers.

Fuse Maximum Interrupting Current - That upper current level that a fuse can successfully clear with assured reliability; the maximum current at a specified maximum design voltage that a fuse if required to clear as specified by the manufacturer.

Fuse Minimum Interrupting Current - That lower limit of current that upon melting a fuse can be assured of successfully clearing; a term generally associated with back-up current-limiting fuses indication the lower limit of current that the fuse can clear upon melting.

Ground Fault Circuit Interrupter - A device whose function is to interrupt, within a predetermined time, the electrical circuit to the load when a current to ground exceeds some predetermined value that is less than that required to operate the overcurrent protective device of the supply circuit.

Class A Ground Fault Circuit Interrupter (GFCI) - A protective device that will interrupt the circuit to the load when the ground fault current is 6 mA or more but not when the ground fault current is 4 mA or less (there will be a less then 10% current limit variation when the ambient air temperature is less than –5 °C or more than 40 °C) in a time

• (a) not greater than that given by the equation T = (20 / I)^1.63, where
  T is in seconds; and
  I is the ground fault current in rms milliamperes for fault currents between 4 mA and 260 mA; and
• (b) not greater than 25 ms for ground fault currents over 260 mA.

In addition, a Class A GFCI is to be capable of interrupting the circuit to the load, in keeping with the above requirements if the identified circuit conductor (neutral) becomes inadvertently grounded between the interrupter and the load. The prime function of a Class A GFCI is to provide protection against hazardous electric shocks from leakage current flowing to ground from defective circuits or equipment. It does not provide protection against shock if a person makes contact with two of the circuit conductors on the load side of the GFCI.

Class A GFCIs are marked “GROUND FAULT CIRCUIT INTERRUPTER CLASS A” or with an  abbreviated form such as “GFCI CL A”, “GFCI A”, or “CL A” where the area available for marking makes the complete text impracticable.

Interrupter - An element designed to interrupt specific currents under specified conditions.

Interrupter Switch - An air switch, equipped with an interrupter, for making and/or breaking specified currents.
NOTE: The nature of the current made or broken, and/or both, may be indicated by suitable prefix; that is, load interrupter switch, fault interrupter switch, capacitor current interrupter switch, etc.

Portable Ground Fault Circuit Interrupter - A ground fault circuit interrupter which is either of the direct plug-in type or specifically designed to receive current by means of a flexible cord or cable and an attachment plug and which incorporates one or more receptacles for the connection of equipment which is provided with a flexible cord or cable and an attachment plug.

Zero Awaiting Interrupters - Any device that requires alternating current passing through a zero reference to interrupt a circuit; a general name given to expulsion type fuses (cutout, fuse links, Bay-O-Net links, cartridge fuses).

Zero Forcing Action Interrupters - A device that does not require the current to pass through a zero reference to interrupt a circuit; any device that inserts a large resistance into the circuit causing a phase angle shift to near unity and the forcing of the system current to zero; a general name given to current-limiting type fuses.