VD4-12 Spring-operated circuit breaker control, signal circuit (Module operating mechanism)

SFA: switch na maaaring palitan
SFB: button na maaaring palitan
BB: thermal relay
BT: pagsukat ng temperatura
MS: motor para sa imbakan ng enerhiya
QF: dc air circuit breaker
QC: ground switch
WCC: Wire Connection Center
V: rectifier bridge
Ang loob ng frame ay nahahati sa loob ng circuit breaker car