Instruction manual

KRB-5377
25
Fig. 19-2 Breaker circuits 2
Table 10-2 Terminal functions and circuit symbols 2
Symbol Meaning Symbol Meaning
S
1
- S
4
Current sensors *6 LRC Latch release coil
CT
1
- CT
3
Power supply CT *7 SHT Shunt trip device
MHT Magnet hold trigger UVT Undervoltage trip device
M Spring charging motor Main/control circuit contact
Ry Control relay Hand connector
SW1 Spring charged “OFF” switch User wiring
SW2 Control relay a contact Relay or LED
*1 For 4-pole ACBs.
*2 For 4-pole ACBs equipped with N-phase protection and/or ground fault trip functions.
*3 Used for 3-pole ACBs with ground fault trip functions to be installed in a 3-phase, 4-wire circuit.
*4 Do not connect the ON switch with auxiliary switch b-contact in series. Doing so may cause pumping.
*5 To be stated when ordering
*6 Conversion ratio: CT rated primary current I
CT
(A)/150 mV
*7 Provide power to the overcurrent trip device when control power is lost.