TM 1-1520-238-T-6 9–99 9–7. SYSTEM DESCRIPTION (cont) 9–7 (13) CPG Station DC Ground Circuit Protection System. The CPG station dc ground circuit protection system (fig. 9–92) saves weight by eliminating large portions of heavy wiring, reduces cost, maintains a constant load voltage due to parallel circuitry, and protects the hellfire mission equipment (HME). (a) Operation of the L OUTBD LCHR DC circuit breaker (CB25) in conjunction with a RCCB is the same for HME circuit breakers and associated RCCBs. Only the L OUTBD LCHR DC circuit breaker (CB25) and associated RCCB is explained. (b) When power is applied to the missile system, current flows from ground through L OUTBD LCHR DC circuit breaker (CB25) to the RCCB. Current flows from contact 3 of the RCCB through the coil to contact A1 energizing the RCCB. When the RCCB is energized, the dc bus is connected to the left outboard launcher dc load. When an overload condition occurs, the current through the L OUTBD LCHR DC circuit breaker increases (CB25), opening the L OUTBD LCHR DC circuit breaker (CB25). When the L OUTBD LCHR DC circuit breaker (CB25) is opened, the RCCB deenergizes, removing the left outboard launcher load from the dc bus. A1 A2 3 5A 28 VDC LOAD DC BUS RCCB MSL L INBD LCHR DC CB23 CB202 A1 A2 3 5A 28 VDC LOAD DC BUS MSL L OUTBD LCHR DC CB25 A1 A2 3 5A 28 VDC LOAD DC BUS MSL R OUTBD LCHR DC CB19 A1 A2 3 5A 28 VDC LOAD DC BUS MSL R INBD LCHR DC CB22 A1 A2 3 5A 28 VDC LOAD DC BUS RCCB RCCB RCCB MSL ARM CB27 CB201 CB203 CB204 RCCB CB3 M69-370 Figure 9–92. CPG Station DC Ground Circuit Protection System Interface Diagram