GE RELAY – IC2820A102 GENERAL ELECTRIC AC LOW VOLTAGE RELAYS
GE GROUND-FAULT RELAY
The GE IC2820A102 is a fast-acting hand-reset relay designed to interrupt control power of a line contactor on sensing a ground current in the lines to an ac motor load or other ac equipment. If a ground fault can be removed within a few cycles of its initiation, damage to a motor or other ac equipment can be minimized. For example, on a large induction or synchronous motor when an insulation failure occurs to ground, the fault current will be removed before damage is done to the laminations, thus making it possible to repair the motor at a minimum of expense and downtime.
The GE relay is designed for use with a window-type current transformer where the three load leads (for a 3-phase system) are placed through the window. When a ground fault occurs, the vector sum of the currents in the load cables will not equal zero and this sum will cause a current in the secondary of the current transformer that will energize the relay coil. This current will actuate the relay to ‘‘TRIP’’, opening the normally closed contacts, and closing the normally open contacts shorting out the rectifier and coil. The trip lever holds the relay in this position until the lever is moved in a counterclockwise direction to the ‘‘RESET’’ position.
GE DIFFERENTIAL RELAY
The GE IC2820A102A differential relay detects any difference in current going in and out of each phase of a wye-connected motor. The current difference will trip the differential relay and shut down the motor by opening the motor-line contactor.
For more information on these relays, please click here, to view page 23 in section 5 of the GE Industrial Control Rainbow Catalog for application information, dimensions, outline drawings and how to order.