Instruction manual

KRB-5377
23
Fig. 17-2 Breaker circuits 2
Table 9-2 Terminal functions and circuit symbols 2
Symbol Meaning Symbol Meaning
S
1
- S
4
Current sensors *5 LRC Latch release coil
CT
1
- CT
3
Power supply CT *6 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: Conversion ratio: CT rated primary current I
CT
(A)/150 mV
*6: Provide power to the overcurrent trip device.
1 1 1
3rd character: Type of contact 1: Common, 2: b-contact, 4: a-contact
2nd character: Type of switch 1: Auxiliary switch, 2: Position switch (CONN.), 3: Position switch (TEST),
4: Position switch (ISOLATED), 5: Position switch (INSERTED)
1st character: Number of contact 1 - 0:Number of auxiliary and position switch
A – C: Number of auxiliary switch for microload
Fig. 18 Terminal number and function of auxiliary and position switches