Ground fault circuit interrupter with reverse wiring protection
A circuit interrupter comprises a pair of fixed contact strips, a pair of movable contact strips, a reset component, a movable component, and a tripping component that contains a reset contact. Each of the fixed contact strips has a fixed contact. Each of the movable contact strips has a fixed end and a movable end which has a movable contact arranged for contacting one of the corresponding fixed contacts. The movable component is disposed to sustain the movable ends of the movable contact strips and is capable of either being latched with or released from the reset component to move between a first position where the movable contacts are separated from the fixed contacts and the movable contact strips are separated from the reset contact, a second position where either the movable contact strip contacts the reset contact and the movable contacts are separated from the fixed contacts, and a third position where the movable contacts make contact with the respective fixed contacts and the movable contact strips are separated from the reset contact. The tripping component is capable of latching the reset component with the movable component for the movable component to move to the third position upon detection of a reset request and releasing the reset component from the movable component for movable component to move to the first position upon detection of a fault condition.
1. A circuit interrupter comprising:
a pair of fixed contact strips, each of the fixed contact strips having a fixed contact;
a pair of movable contact strips, each of the movable contact strips having a fixed end and a movable end, each of the movable ends having a movable contact arranged for contacting one of the corresponding fixed contacts;
a reset component;
a tripping component comprising a reset contact;
a movable component disposed to sustain the movable ends of the movable contact strips, the movable component capable of either being latched with or released from the reset component to move between a first position where the movable contacts are separated from the fixed contacts and the movable contact strips are separated from the reset contact, a second position where one movable contact strip contacts the reset contact and the movable contacts are separated from the fixed contacts, and a third position where the movable contacts make contact with the corresponding fixed contacts and the movable contact strips are separated from the reset contact;
wherein the tripping component capable of latching the reset component with the movable component for the movable component to move to the third position upon detection of a reset request and capable of releasing the reset component from the movable component for the movable component to move to the first position upon detection of a fault condition.
2. The circuit interrupter of claim 1 , wherein
the fixed contacts have a flat contact surface and the movable contacts have a protruding contact surface.
3. The circuit interrupter of claim 2 , wherein
the fixed contacts and the movable contacts comprise silver.
4. The circuit interrupter of claim 1 , wherein
the reset component comprises a reset button, a reset shaft attached to the reset button, and a reset spring surrounding an upper portion of the reset shaft.
5. The circuit interrupter of claim 4 , wherein
the movable component comprises a movable assembly and a latching plate capable of being latched with the reset shaft and holding the movable assembly to move between different positions.
6. The circuit interrupter of claim 5 , wherein
the movable assembly comprises a sustaining portion extended under the movable ends of the movable contact strips, a cavity to accommodate a lower portion of the reset shaft, a middle spring disposed in the cavity and surrounding the lower portion of the reset shaft, at least one latching slot for the latching plate to insert, a reverse shaft attached to a lower plate of the movable assembly, and a reverse spring surrounding the reverse shaft.
7. The circuit interrupter of claim 5 , wherein
the tripping component further comprises a trip shaft capable of being clasped with the latching plate, a trip spring surrounding the trip shaft, an electromagnetic unit capable of moving the trip shaft, and a control circuit to activate the electromagnetic unit upon detecting a predetermined condition.
8. The circuit interrupter of claim 1 , further comprising:
a strap for mounting the circuit interrupter and for providing a grounding connection; and
a housing to accommodate the movable strips, the fixed strips, the reset component, the movable component, and the tripping component.