Fixed Circuit Breakers
Introduction
The diagrams are shown with circuits de-energized, all devices open, connected, and charged, and relays in normal position.
Terminals
shown in red 
must be connected by the customer.
Remote Operation with Motor Mechanism
|
Symbol |
Description |
|---|---|
|
MN |
Undervoltage trip release |
|
MX |
Shunt trip release |
|
A4 |
Opening order |
|
A2 |
Closing order |
|
B4, A1 |
Motor mechanism power supply |
|
L1 |
Manual position (manu) |
|
B2 |
SDE interlocking (mandatory for correct operation) |
|
BPO |
Opening push button |
|
BPF |
Closing push button |
Remote Operation with Communicating Motor Mechanism
|
Symbol |
Description |
|---|---|
|
MN |
Undervoltage trip release |
|
MX |
Shunt trip release |
|
B4, A1 |
Motor mechanism power supply |
|
BSCM |
Breaker status control module |
Indication Contacts
|
Symbol |
Description |
|---|---|
|
OF2/OF1 |
Device ON/OFF indication contacts |
|
OF4/OF3 |
Device ON/OFF indication contacts (NSX400-630 DC) |
|
SDE |
Electrical-fault indication contact |
|
SD |
Trip-indication contact |
|
CAF2/CAF1 |
Early-make contact (rotary handle only) |
|
CAO1 |
Early-break contact (rotary handle only) |
|
Color Code for Auxiliary Wiring |
Description |
|---|---|
|
RD |
Red |
|
WH |
White |
|
YE |
Yellow |
|
VT |
Violet |
|
GY |
Gray |