Wiring Diagrams
PowerPacT B Circuit Breaker Wiring Diagrams
PowerPacT B DC Systems
Selection of a dc circuit breaker is based on the type of dc system, the rated voltage, and the maximum short-circuit current at the point of installation.
DC Systems
|
Distribution |
Faults |
Fault Comments |
Worst Case |
|---|---|---|---|
|
Ungrounded Source |
Fault B |
Isc maximum Both polarities (positive and negative) are involved in the fault. |
Simultaneous faults at A and D or C and E Either polarity may be involved at voltage V. |
|
Fault A or C |
No consequences. |
||
|
Faults A and D or Faults C and E |
Isc max Either polarity may be involved at voltage V. |
||
|
Grounded Middle Point |
Fault B |
Isc maximum Both polarities (positive and negative) are involved in the fault. |
Fault B Each polarity may be involved at voltage V/2. |
|
Fault A or C |
Isc < Isc maximum at V/2 The negative or positive polarity is involved. |
||
|
Grounded Negative |
Fault A |
Isc maximum Positive polarity is involved in the fault. |
Fault A All poles taking part in breaking must be placed in series on the positive polarity. If the negative polarity is grounded, an additional pole must be provided to be used for isolation of the negative pole but not for breaking. |
|
Fault B |
Isc maximum Both polarities (positive and negative) are involved in the fault. |
PowerPacT B DC Wiring Diagrams
|
Grounded Negative |
Grounded Middle Point |
Ungrounded Source |
||
|---|---|---|---|---|
|
Type |
|
|
||
|
125 Vdc |
250 Vdc |
≤ 250 Vdc |
≤ 250 Vdc |
|
|
1P |
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|
2P |
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|
3P |
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|
4P |
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Grounded B-Phase Systems (Corner-Grounded Delta)
Three-Phase 240 Vac Corner-Grounded Delta System.
2P Frame
|
BD |
BG |
BJ |
|
|---|---|---|---|
|
Ampere rating (A) |
15–125 |
||
|
Voltage rating (Vac) |
240 |
||
|
UL Interrupting rating (kA) |
18 |
35 |
65 |
PowerPacT B Electrical Accessory Wiring Diagrams
Indication Contacts
Indication Contacts
|
OF |
Device ON/OFF indication contacts |
|
SD |
Trip indication contact |
Color Code for Auxiliary Wiring
|
RD: YE: BK: GN: PU: GY: |
Red Yellow Black Green Purple Grey |
Remote Operation (MN/MX Voltage Release)
Remote Operation
|
MN or MX |
Undervoltage Release
Shunt trip Release |
Color code for auxiliary wiring
|
OR: BL: WH: |
Orange Blue White |