Drawout Circuit Breaker
Definition
A drawout circuit breaker is composed of the moving part (also called the circuit breaker) and the fixed part (or chassis).
Drawout Circuit Breaker Moving Part Description
The following image shows the standard version of the moving part of a drawout circuit breaker (no optional accessories).
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A Carrying grip B Arc chute C Product identification label, with manufacturing date D Blue fault-trip reset button E Opening pushbutton F Closing pushbutton G Disconnectable contact block cover H Front cover I Spring charging handle J VBP pushbutton locking cover (optional) K Rating plate L Spring charged and ready-to-close indicator M Main-contact position indicator N Window to consult the (optional) CDM mechanical operation counter O Control unit P Control unit transparent cover |
Drawout Circuit Breaker Accessories Description
The following image shows the accessories available for the moving part of a drawout circuit breaker.
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A VDC mismatch protection B Disconnectable contact block C Four OF indication contacts (delivered as standard) D MCH gear motor E CDM mechanical operation counter Z1, Z2 See following images |
The following images zoom in on the accessories for the moving part of a drawout circuit breaker.
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F Standard SDE1 fault-trip indication contact G Optional SDE2 fault-trip indication contact or RES electrical remote reset H Microswitch |
I MN undervoltage release or MX2 opening voltage release J XF closing voltage release K MX1 opening voltage release L PF ready-to-close contact M VSPO OFF-position locking by keylocks N VCPO OFF-position locking by padlocks |
Chassis Description
The following image shows the standard version of the chassis (no optional accessories).
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A Carrying grip B Terminal blocks for standard accessories C Terminal block identification plate D Chassis locking by padlocks E Moving part position indicator F Racking handle socket G Position release button |
H Racking handle storage space I Racking handle J Drawout grip K Extension rail L Top safety shutter M Bottom safety shutter |
Chassis Accessories Description
The following image shows the accessories available for the chassis.
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A VDC mismatch protection B Drawout device position contacts C Terminal blocks for optional accessories D VSPD chassis locking by keylocks |
E VPOC open-door racking interlock F Circuit breaker auxiliary terminal shield G VPEC door interlock |
Chassis Terminal Block Description
Terminal block supplied as standard on the
chassis
Optional terminal block on the chassis
Assignment of Chassis Terminal Blocks
 DANGER |
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HAZARD OF ELECTROCUTION FOR VOLTAGES ABOVE 480 VAC
If a voltage greater than 480 Vac is connected to a terminal,
it is forbidden to connect adjacent terminals to a 24 Vdc SELV (Safety
Extra Low Voltage) power supply in order to observe the insulation
distances. For example, if you connect a 690 Vac supply to the UC4
terminal block, you must not connect a 24 Vdc SELV supply to the SDE2
terminal block.
Failure to follow these instructions will result in death or serious injury.
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The following table describes the assignment and the availability of the terminal blocks for drawout circuit breakers:
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Standard terminal blocks are delivered on the chassis, even if the associated accessories are not installed in the circuit breaker.
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Optional terminal blocks are delivered on the chassis only if the associated optional accessories are installed in the circuit breaker.
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Block |
Marking |
Description |
Availability |
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A |
CE2-CE3 |
2 CE connected position contacts |
Optional |
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B |
COM |
Terminal block for the external power supply of the MicroLogic Active control unit |
Standard |
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UC1 |
Zone selective interlocking (ZSI) or MDGF module input |
Standard |
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UC2 |
Neutral external sensor or MDGF module input |
Standard |
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SDE2/RES |
SDE2: additional fault-trip indication contact or RES: electrical remote reset |
Optional |
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M2C/UC4/ESM |
M2C: not applicable, or UC4: external voltage connector, or ESM: not applicable |
Optional |
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UC3 |
External voltage connector |
Standard on 3P circuit breakers Optional on 4P circuit breakers |
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SDE1 |
SDE1 fault-trip indication contact |
Standard |
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MN/MX2 |
MN undervoltage release or MX2 opening voltage release |
Standard |
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MX1 |
MX1 opening voltage release |
Standard |
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XF |
XF closing voltage release |
Standard |
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PF |
PF ready-to-close contact |
Standard |
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MCH |
MCH gear motor |
Standard |
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OF1-OF4 |
4 OF indication contacts |
Standard |
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C |
CD1-CD2 |
2 CD disconnected position contacts |
Optional |
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CE1 |
1 CE connected position contact |
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CT1 |
1 CT test position contact |