Reverse wiring protection device for ground fault circuit interrupter
The present invention relates to a reverse wiring protection device for ground fault circuit interrupter that includes a tripper and control circuit. The tripper comprises: a pull rod with flat, a L-shaped latch, a balance frame coupled with the latch moving up and down with the pull rod, a trip coil, a plunger and a contact switch (K) which is capable of energizing and de-energizing the trip coil. The reset can't be depressed when an installer or user miswires the line and the load. GFCI can only be operating normally when it is installed properly
1. A reverse wiring protection device for GFCI receptacles, the device comprising: a pull rod, a latch, a balance frame, a trip coil, a contact switch (K) and a control circuit,
wherein said pull rod has a flat on one end and a reset button on the other end with first axis, said pull rod associated with a reset spring, said flat having a first surface (L) and a second surface (R), said pull rod to move along said first axis between a first position and a second position, said pull rod to activate said contact switch (K) in said first position, the first surface (L) of said flat to contact with said latch in said second position to enable said pull rod to lift said balance frame through said latch;
wherein said latch comprises a first part and a second part which are both in L-shaped 90 degrees, said balance frame to lift movable contacts against fixed contacts along said first axis;
wherein said trip actuator comprises said trip coil, a trip spring, and a plunger to move along first axis perpendicularly, one end of said plunger coupled with said second part of said latch to activate said latch to move along a second axis between a lock position and an unlock position, in the lock position, said second part of said latch being able to block said flat to pass, in the unlock position, said plunger being able to overcome the bias force from said trip spring to make said latch activated and release the flat;
said contact switch (K) to make said trip coil energized or de-energized;
said control circuit to maintain the energized time for said trip coil, when it is energized by said contact switch,
wherein said pull rod has a taper end on the end of flat to contact with said contact switch (K), the first part of said has a narrow slot, and the second part of said latch has a lock hole, of which one end is circular and the other end is rectilinear.
2. The reverse wiring protection device according to claim 1 , wherein the end of said plunger has an annular groove, the two sides of the slot of said latch are fastened into the annular groove of said plunger, so that the movement of said plunger can be transferred to said latch along the second axis direction, in this way, said pull rod could be locked and unlocked by said latch.
3. The reverse wiring protection device according to claim 1 , wherein said contact switch (K) closes when the second surface (R) of said flat is touching or to be touching said latch.
4. The reverse wiring protection device according to claim 3 , wherein said contact switch (K) is a micro-switch.
5. A reverse wiring protection device for GFCI receptacles, the device comprising: a pull rod, a latch, a balance frame, a trip coil, a contact switch (K) and a control circuit,
wherein said pull rod has a flat on one end and a reset button on the other end with first axis, said pull rod associated with a reset spring, said flat having a first surface (L) and a second surface (R), said pull rod to move along said first axis between a first position and a second position, said pull rod to activate said contact switch (K) in said first position, the first surface (L) of said flat to contact with said latch in said second position to enable said pull rod to lift said balance frame through said latch;
wherein said latch comprises a first part and a second part which are both in L-shaped 90 degrees, said balance frame to lift movable contacts against fixed contacts along said first axis;
wherein said trip actuator comprises said trip coil, a trip spring, and a plunger to move along first axis perpendicularly, one end of said plunger coupled with said second part of said latch to activate said latch to move along a second axis between a lock position and an unlock position, in the lock position, said second part of said latch being able to block said flat to pass, in the unlock position, said plunger being able to overcome the bias force from said trip spring to make said latch activated and release the flat;
said contact switch (K) to make said trip coil energized or de-energized;
said control circuit to maintain the energized time for said trip coil when it is energized by said contact switch,
wherein said control circuit includes a silicon controlled rectifier (SCR) and a charge circuit in the form of a resistor connected in parallel with a capacitor, said contact switch connected in series with the charge circuit, and the charge circuit connected in series with a gate pole of the SCR.
6. The reverse wiring protection device according to claim 5 , wherein said control circuit maintains about 20-40 mS for said trip coil.