A ground fault accessory for a molded case circuit breaker is provided by converting a shunt trip accessory to automatically trip the breaker when a ground fault occurs. A printed circuit mounted in the housing with the shunt trip eliminates the need for a separate ground fault relay. The ...
1. A ground fault trip unit for a circuit breaker protecting an electrical system having a line conductor and a grounded neutral conductor comprising: sensing coil means through which said neutral conductor passes; neutral-to-ground fault detection means connected to said sensing coil means and ge...
The ground-fault interrupter, or GFI, is a fast-acting circuit breaker designed to shut off electric power in the event of a ground-fault. It works by comparing the amount of current going to and returning from equipment along the circuit conductors. If you are acquiring a GFI solution from...
Resonant grounding provides self-extinction of the fault arc in overhead lines for about 80 percent of temporary ground faults [1]. Considering that about 80 percent of ground faults are temporary, we conclude that more than 60 percent of overhead line ground faults clear without breaker ...
This device is designed to develop UL-943 compliant system like a GFCI receptacle or circuit-breaker. The self-test functionality ensures that the circuit is operating correctly prior to an actual fault event. A GFCI device relies on the imbalance of differential current through the transformer to...
Ground fault trip units for circuit breakers are tested by a passive test circuit which includes a test conductor passing through the current transformer sensing coil(s), and a test switch which selectively connects the test conductor in a loop which sim
In addition tothestandard setpointsetting,a prewarning alarm of either50%or 100%is avai lable.Thesetwo alarms control two SPDTcontactswhich al lowfor information trans-mission(such astoa PLC)orpower interruption(such asthrough a contactororshunt trip breaker). Sincethevalues are measured with ...
The purpose is to carry fault current back to the source, where that conductor is connected to the neutral so the current will cause a circuit breaker to trip. This is for personnel safety in the event that an electrical fault in a piece of equipment makes the metallic case "hot." What...
is insensitive to short term transients; wherein the speed of breaker action is proportional to the differential current; wherein the relay circuit is composed entirely of solid state elements; and wherein the circuit breaker will remain in its open position after activation until deliberately reset...
RV4141 Low Power Ground Fault Interrupter . Description. The is a low power controller for AC receptacle ground fault circuit interrupters. These devices detect hazardous current paths to ground and ground to neutral faults. The circuit interrupter then