Drawout Circuit Breaker - MTZ2/MTZ3 with MicroLogic Active Control Unit IEC User Guide for AC applications

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).

A Carrying grip

B Arc chute

C Blue fault-trip reset button

D Product identification label, with manufacturing date

E Opening pushbutton

F Closing pushbutton

G Spring charging handle

H Terminal block connectors

I Front cover

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.

A VDC mismatch protection

B Terminal block connectors for optional accessories

C Terminal block connectors for standard accessories

D Optional block of four OF indication contacts or EF combined connected/closed contacts

E Four OF indication contacts (delivered as standard)

F KMT grounding kit

G MCH gear motor

H 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.

I Standard SDE1 fault-trip indication contact

J Optional SDE2 fault-trip indication contact or RES electrical remote reset

K Microswitch

L IBPO interlock between racking handle and opening pushbutton

M MN undervoltage release or MX2 opening voltage release

N MX1 opening voltage release

O PF ready-to-close contact

P XF closing voltage release

Q VCPO OFF-position locking by padlocks

R VSPO OFF-position locking by keylocks

Chassis Description

The following image shows the standard version of the chassis (no optional accessories).

A Carrying grip

B Terminal blocks supplied as standard

C Terminal block identification plate

D Top safety shutter

E Bottom safety shutter

F Rail release tab

G Drawout grip

H Extension rail

I Racking handle storage space

J Racking handle

K Moving part position indicator

L Racking handle socket

M Position release button

N Chassis locking by padlocks

O Latch for switching chassis locking from disconnected position to any position (connected, test, disconnected)

P Shutter locking block

Chassis Accessories Description

The following image shows the accessories available for the chassis.


A VDC mismatch protection B Drawout device position contacts C Optional terminal block D Circuit breaker auxiliary terminal shield E VPOC open-door racking interlock	F VIVC shutter position indication and locking G IBPO interlock between racking handle and opening pushbutton H VSPD chassis locking by keylocks I VPEC door interlock

Chassis Terminal Block Description

Terminal block supplied as standard on the chassis

Optional terminal block on the chassis

(1) Supplied as standard with chassis for MasterPacT MTZ2/MTZ3 circuit breakers only

(2) Supplied as standard with 3P chassis only

Assignment of Chassis Terminal Blocks

DANGER
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.

DANGER

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.

The following table describes the assignment and the availability of the terminal blocks for drawout circuit breakers:

Standard terminal blocks are delivered on the chassis, even if the associated accessories are not installed in the circuit breaker.
Optional terminal blocks are delivered on the chassis only if the associated optional accessories are installed in the circuit breaker.

Block	Marking	Description	Availability
A	CD1–CD3 CE4–CE6	3 CD disconnected position contacts or 3 CE connected position contacts	Optional
B	COM	ULP port module	Standard
	UC1	Zone selective interlocking (ZSI) or MDGF module input	Standard
	UC2	Neutral external sensor or MDGF module input	Standard
	SDE2/RES	SDE2: additional fault-trip indication contact or RES: electrical remote reset	Optional
	UC4	External voltage connector	Optional
	UC3	External voltage connector	Standard on 3P circuit breakers
	UC3	External voltage connector	Optional on 4P circuit breakers
	M2C/ESM	M2C or ESM: not applicable	Optional
	SDE1	SDE1 fault-trip indication contact	Standard
	CE1–CE3 CT4–CT6	3 CE connected position contacts or 3 CT test position contacts	Optional
C	MN/MX2	MN undervoltage release or MX2 opening voltage release	Standard
	MX1	MX1 opening voltage release	Standard
	XF	XF closing voltage release	Standard
	PF	PF ready-to-close contact	Standard
	MCH	MCH gear motor	Standard
D	OF11–OF24 EF11–EF24	8 OF indication contacts or 8 EF combined connected/closed position auxiliary contacts	Optional
	OF1–OF4	4 OF indication contacts	Standard
	CT1–CT3 CD4–CD6 CE7–CE9	3 CT test position contacts or 3 CD disconnected position contacts or 3 CE connected position contacts	Optional