Abstract: An electrical circuit interrupter for connection between two conductors has a first fixed contact electrically directly connected to one of the conductors, a second fixed contact adjacent the first fixed contact, a movable contact electrically directly connected to the other of the conductors, and a positive-temperature-coefficient resistor connected between the first and second fixed contacts. The movable contact is displaceable between a first closed position engaging only the first fixed contact, a second position engaging only the second contact, and an open position engaging neither of the fixed contacts, so that in the first position current can flow between the conductors without passing through the resistor, in the second position current flows through the resistor and current flow is limited thereby, and in the open position current cannot flow between the conductors.