Electrical Auxiliary Devices
Summary of Electrical Auxiliary Devices
The following table shows electrical auxiliary devices that can be added to circuit breakers. Electrical auxiliary devices can be installed on site. For more information, see LVPED221001EN, ComPacT NSX & NSXm Catalogue.
|
Electrical auxiliary device |
Use |
3P/4P circuit breaker |
3P/4P ELCB |
|---|---|---|---|
|
OF indication auxiliary (wired or wireless) |
View the on/off status of the circuit breaker remotely. |
✔ | ✔ |
|
SD indication auxiliary (wired or wireless) |
View the trip status of the circuit breaker remotely. |
✔ | ✔ |
|
MX shunt trip |
Send an electrical trip command remotely. |
✔ | ✔ |
|
MN undervoltage release |
Trip the circuit breaker when the control voltage drops below a tripping threshold. |
✔ | ✔ |
|
MN undervoltage release with time-delay unit |
Intended to avoid nuisance tripping in systems with frequent voltage dips lasting from 200 ms to 3 s. |
✔ | ✔ |
|
SDx module |
Provide alarm and fault differentiation for the ComPacT NSXm earth-leakage circuit breaker. |
– | ✔ |
Slots for Electrical Auxiliary Devices for Circuit Breaker
The following figures show the available slots for electrical auxiliary devices mounted in the circuit breaker case. One auxiliary can be installed in each slot. For more information, see LVPED221001EN, ComPacT NSX & NSXm Catalogue.
|
3P circuit breaker |
4P circuit breaker |
|---|---|
|
A MN undervoltage release or MX shunt trip B OF indication auxiliary (wired or wireless) C SD indication auxiliary (wired or wireless) |
|
Slots for Electrical Auxiliary Devices for Earth-Leakage Circuit Breaker
The following figures show the available slots for electrical auxiliary devices mounted in the case of the earth-leakage circuit breaker (ELCB). One auxiliary can be installed in each slot.
|
3P ELCB |
4P ELCB |
|---|---|
|
A MN undervoltage release or MX shunt trip B OF indication auxiliary (wired or wireless) C SD indication auxiliary (wired or wireless) |
|
The following figures show the available slots for electrical auxiliary devices mounted outside the earth-leakage circuit breaker (ELCB). Two SDx modules can be installed.
|
3P ELCB |
4P ELCB |
|---|---|
|
A SDx module (1 or 2 maximum) |
|
For more information, see LVPED221001EN, ComPacT NSX & NSXm Catalogue.
Operation of the Indication Contacts
The following figures show the position of the indication contacts for each position of the handle and main contacts.
|
Name |
Contact number |
Position of the handle and contacts |
||
|---|---|---|---|---|
|
Device status |
– |
OFF |
ON |
Tripped (by MN/MX, push-to-trip, or protection) |
|
Handle position |
– |
|||
|
Main contact position |
– |
Open |
Closed |
Open |
|
OF auxiliary contact position |
1-2 |
Closed |
Open |
Closed |
|
1-4 |
Open |
Closed |
Open |
|
|
SD auxiliary contact position |
1-2 |
Closed |
Closed |
Open |
|
1-4 |
Open |
Open |
Closed |
|
Operation of the Wireless Indication Auxiliaries
The wireless indication auxiliary provides the same information as a standard wired auxiliary contact in OF or SD positions. The information is sent remotely to a gateway or Panel Server.
During commissioning of the wireless indication auxiliary, the user defines the type of information sent: Open/Close or Trip.