TM 5-3895-374-24-1RATINGS1.The type GC-100 Ground Fault Protection System is suitable for use on equipment connected to a source having200,000 RMS amperes or less available ground fault current.2.The GC 100 relay contacts (internally connected to terminals 12 and 19) are rated as follows:Voltage:120 VacCurrent:Inrush 50 amperes, Continuous 10 amperesBreak 10 amperes3.Normal transient voltage surges are suppressed to a level that will not cause the GFR to nuisance trip. Underextreme transient conditions, additional protection may be necessary. Contact your local Square D office forassistance if repeated outage caused by transient line voltage surges is experienced.4.The GC-100 relay has the following power requirements:Voltage:120 VacPower:Standby3 watts TypicalAfter Trip12 watts TypicalNote, however, that the switch or circuit breaker trip coil requires additional power from the control supply. Thecontrol power transformer must have adequate size and regulation characteristics to trip the disconnect when theline voltage drops to 55% of its normal value.5.Restraint interlocking between relays:A.Each Ground Fault Relay Restraint Output can drive up to eight restraint unit loads.B.Total restraint unit loads may be calculated by adding the number of Restraint To Time Delay Inputs plustwice the number of Lockout Restraint Inputs which the Restraint Output must drive.i.e., Restraint To Time Delay Input=1 unit loadLockout Restraint Input=2 unit loadsC.Each GFR Restraint To Time Delay and Lockout Restraint Input can receive signals from up to twentyRestraint Output sources provided that no more than six of the sources can be energized simultaneously.CAUTION INSTRUCTION AND NOTES1.Do not ground terminal 15 or connect it to any terminal other than a number 16 or 17 terminal.2.Note that terminals 18 and 19 are permanently internally connected.3.All Ground Fault Relays using restraint interconnections must have a common ground connected to terminal 18 or19.4.Once the GFR has tripped for any reason, it must be reset before the protected circuit breaker or switch can beturned "on" and remain closed.5.During installation, inspection or replacement, jumper from terminal X1, X3 to terminal X2, X4 on the Sensor toprevent possible high voltage outputs. The jumper must be removed when all wiring is complete.MAINTENANCEThe Ground Fault Relay needs little maintenance due to its solid state control and sensing circuitry. The output relaymounted on the top endwall should be inspected periodically along with the terminal connections for corrosion, pitting andtightness. If the Ground Fault Relay fails to operate properly or is subjected to physical or electrical damage, it should bereplaced.(page 3-96)
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