Description of functions
SF2 circuit breakers
fixed version
GMH stored energy operating mechanism
Wiring diagram
028368
Operation of the electrical GMH stored energy mechanism
This gives the device an opening and closing speed that is independent of the
operator whether the order is electrical or manual.
The electrical control mechanism carries out reclosing cycles and is automatically
recharged by a geared motor each time after closing.
It consists of:
b the stored energy operating mechanism which stores in springs the energy
required to open and close the device
b a manual lever arming device for the springs
b an electrical arming device with a motor to automatically rearm the control
mechanism as soon as the circuit breaker is closed (optional)
b manual push-button controls on the front face of the circuit breaker (red and black)
b an electrical remote-closing device comprising a release and an anti-pumping relay.
b an electrical opening device comprising one or several releases of the following
type:
v shunt opening
v undervoltage
v Mitop, low energy release only used Sepam 100 LA protection relays
b an operation counter
b an open/closed position indicator with a mechanical indicator (black and white)
b an “armed” control mechanism status indicator with a mechanical indicator
and an electrical contact (optional)
b a block of 14 auxiliary contacts, available according to the wiring layout used
b a pressure switch contact activated by a drop in gas pressure (optional: single
or double threshold pressure switch)
DE57420EN
Wiring diagram (principle)
Close CB
Open CB
M
M3
YF +
anti-pumping
Motor
Shunt closing
release
+ anti-pumping
system
Remote control
28
YO1
“Control
mechanism
armed”
indicator contact
YO2
Shunt
opening
release
YM
Undervoltage
release
Mitop
Low energy
release
(Mitop)
Changeover
contact
Pressostat
NO
NC
contacts contacts