0614IB1701

Masterpact MTZ2/MTZ3 Interlocking Actions

An interlocking action is an automatic locking operation provided by interlocking accessories added to the Masterpact MTZ2/MTZ3 device or cradle.

A number of optional interlocking accessories are available for the Masterpact MTZ2/MTZ3 device and cradle. For a complete listing of available interlocks, refer to catalog 0614CT1701, Masterpact MTZ Power Circuit Breakers and Switches, available on the Scheider Electric website.

For detailed installation instructions on field-installable interlocks, refer to the installation instructions shipped with these accessories.

Masterpact MTZ2/MTZ3 Cradle Rejection Feature

The cradle rejection feature allows the installation of a Masterpact MTZ2/MTZ3 device only in a cradle with compatible characteristics.

Cradle rejection pins offer over 100 different combinations that can be selected so that a device can only be mounted on a cradle with the matching combination.

Masterpact MTZ2/MTZ3 Cradle Rejection

The use of cradle rejection pins is optional. One cradle rejection accessory is required for each device.

For information on the accessory installation, consult instruction sheet HRB28360 on the Schneider Electric website.

Masterpact MTZ2/MTZ3 Cradle Rejection Pin Locations

The following illustration shows the pin location on the cradle and device, respectively.

The pin combination selected on the cradle must correspond to the pin combination selected on the device (see following table). For example, the combination ABCD on the cradle corresponds to the combination 567 on the device.

Pins on the cradle are labeled A, B, C, D, E, F, G.

Pins on the device are labeled 1, 2, 3, 4, 5, 6, 7.

Masterpact MTZ2/MTZ3 Cradle Rejection Recommended Pin Combinations

The following are the recommended pin combinations:

Pins on Cradle

Pins on Device

Pins on Cradle

Pins on Device

ABCD

567

BCDE

167

ABCE

467

BCDF

157

ABCF

457

BCDG

156

ABCG

456

BCEF

147

ABDE

367

BCEG

146

ABDF

357

BCFG

145

ABDG

356

BDEF

137

ABEF

347

BDE

136

ABEG

346

BDFG

135

ABFG

345

BEFG

134

ACDE

267

CDEF

127

ACDF

257

CDEG

126

ACDG

256

CDFG

125

ACEF

247

CEFG

124

ACEG

246

DEFG

123

ACFG

245

   

ADEF

237

   

ADEG

236

   

ADFG

235

   

AEFG

234

   

Masterpact MTZ2/MTZ3 VPEC Door Interlock

With the door interlock:

  • The equipment door is locked and cannot be opened when the drawout device is in the connected or test position.

  • The equipment door can be opened when the drawout device is in the disconnected position.

  • The equipment door can be closed with the drawout device in any position.

VPEC Door Interlock Accessory

The VPEC door interlock accessory is an optional accessory that is mounted on the left or right side of the cradle. One door interlock is necessary for one cradle

For information on the accessory installation, consult instruction sheet NVE35493 on the Schneider Electric website.

Using VPEC Accessory to Lock the Equipment Door

Step

Action

1

Close the equipment door.

2

Put the device into the test or connected position (see Masterpact MTZ2/MTZ3 Connection).

3

Check that the equipment door is locked.

Unlocking Equipment Door Locked with VPEC Accessory

Step

Action

1

Put the device into the disconnected position (see Masterpact MTZ2/MTZ3 Disconnection).

2

Check that the equipment door is unlocked.

Masterpact MTZ2/MTZ3 VPOC Open-Door Racking Interlock

With the racking interlock installed, a drawout Masterpact MTZ2/MTZ3 device cannot be racked in or out when the equipment door is open because the racking handle cannot be inserted.

VPOC Open-Door Racking Interlock

The optional VPOC racking interlock can be installed on the right side of the cradle.

For information on the accessory installation, consult instruction sheet NVE35494 on the Schneider Electric website.

Activating the VPOC Racking Interlock

Step

Action

1

Insert the racking interlock.

2

Press and hold down the opening pushbutton, then check that the racking handle cannot be inserted into the racking handle socket when the equipment door is open.

3

Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket when the equipment door is closed.

Deactivating the VPOC Racking Interlock

Step

Action

1

Pull out the racking interlock.

2

Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket when the equipment door is open or closed.

Masterpact MTZ2/MTZ3 IPA Cable-Type Door Interlock

The IPA cable-type door interlock is an optional accessory. When installed, the door cannot be opened when the device is closed and the device cannot be closed when the door is open.

The cable-type door interlock is mounted on the right-hand side of the device.

When the interlock is installed, the mechanical interlock for transfer switches cannot be implemented.

For information on the accessory installation, consult instruction sheet NVE35495 on the Schneider Electric website.

Mechanically Interlocking Masterpact MTZ Transfer Switches

The mechanical interlocking between Masterpact MTZ transfer switches prevents the interlocked devices from closing at the same time. The following interlocking functions are available:

  • Interlocking between two devices

  • Interlocking between three devices:

    • Three incomers

    • Two incomers and one coupling

    • Two incomers and one replacement

Mechanical Interlocking Between Two Masterpact MTZ Devices

Two devices can be mechanically interlocked by cables or by rods so that both devices cannot be closed at the same time.

QR

QN

 

0

0

1

0

0

1

   

For information on the accessory installation, consult the instruction sheet on Schneider Electric website:

Mechanical Interlocking Between Three Main Masterpact MTZ Device

Mechanical interlocking is between three main devices connected to different power sources.

Only one of the three devices can be in the closed position at a time. The other two devices are held in the locked open position.

QS1

QS2

QS3

0

0

0

1

0

0

0

1

0

0

0

1

     

For information on the accessory installation, consult instruction sheet NVE35498 on the Schneider Electric website.

Mechanical Interlocking Between Two Main and One Tie Masterpact MTZ Devices

Mechanical interlocking is between two main devices connected to different power sources and one tie device.

Two of the three devices can be in the closed position at any time.

QS1

QC

QS2

 

0

0

0

 

1

0

1

 

1

1

0

 

0

1

1

 

1

0

0

*

0

0

1

*
       

For information on the accessory installation, consult instruction sheet NVE35500 on the Schneider Electric website.

Mechanical Interlocking Between Two Main and One Replacement Masterpact MTZ Devices

Mechanical interlocking is between two main devices connected to the same power source and a third device connected to a generator power source.

The generator device is locked open when either or both of the main devices are closed.

QN1

QN2

QR

0

0

0

1

0

0

0

1

0

1

1

0

0

0

1

     

For information on the accessory installation, consult instruction sheet NVE35499 on the Schneider Electric website.

Masterpact MTZ DAE Automatic Spring-Discharge Interlock

The DAE automatic spring-discharge interlock releases the closing spring energy when a drawout Masterpact MTZ2/MTZ3 device is moved from the disconnected position to the withdrawn position.

The DAE interlock is factory installed as a standard interlock mounted inside the device.

Masterpact MTZ2/MTZ3 IBPO Racking Interlock

The IBPO racking interlock is factory installed as a standard interlock mounted inside the device.

With the IBPO racking interlock installed, a drawout Masterpact MTZ2/MTZ3 device cannot be disconnected in the closed position.

Insertion of the racking handle for connection or disconnection of the drawout device is only possible when the opening pushbutton is pressed.

Inserting the Racking Handle with IBPO Racking Interlock Installed

Step

Action

1

Press and hold the opening pushbutton.

2

Insert the racking handle.

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