0614IB1701

Masterpact MTZ2/MTZ3 Locking Actions

Locking the Masterpact MTZ2/MTZ3 Pushbuttons

Installing the optional pushbutton locking cover on the Masterpact MTZ2/MTZ3 device prevents access to the closing and opening pushbuttons:

  • Together or separately.

  • By using a padlock (shackle diameter 5–8 mm).

  • By using a wire seal.

  • By using screws.

Masterpact MTZ2/MTZ3 VBP Pushbutton Locking Accessory

The optional pushbutton locking accessory is a transparent cover, mounted on the front cover of the device, which covers the closing and opening pushbuttons.

For information on the accessory installation, consult instruction sheet NVE16147 on the Schneider Electric website.

Locking the Masterpact MTZ2/MTZ3 Pushbuttons

Step

Action

1

Close the transparent covers of the locking accessory.

NOTE: One or both transparent covers of the locking accessory can be closed and locked.

2

Lock the transparent covers in place by using a padlock, lead seal, or screws.

Padlock

Lead Seal

Screws

 

Padlocking the Masterpact MTZ2/MTZ3 Device Open

Masterpact MTZ2/MTZ3 VCPO OFF-Position Locking Accessory

The optional off-position locking accessory can be mounted on the front face of the device.

For information on the accessory installation, consult instruction sheet NVE16146, available at the Schneider Electric website.

Locking the Masterpact MTZ2/MTZ3 Device Open with VCPO

Step

Action

1

Press and hold down the opening pushbutton.

2

With the opening button pressed, pull out the tab of the off-position locking accessory.

3

Insert the padlock in the tab and close the padlock.

Release the opening pushbutton.

Unlocking the Masterpact MTZ2/MTZ3 Device Locked with VCPO

Step

Action

1

Remove the padlock.

2

The tab of the OFF-position locking accessory retracts.

3

Press the closing pushbutton to close the device.

Keylocking the Masterpact MTZ2/MTZ3 Device Open

Optional keylocks can be used:

  • To lock one Masterpact MTZ2/MTZ3 in the open position. When locked the device cannot be closed either locally with the closing pushbutton or remotely.

  • To interlock several Masterpact MTZ2/MTZ3 devices locked with the same key.

To use keylocks to lock the device in the open position, an optional OFF-position locking accessory is necessary.

The keylocks can be used in addition to padlocks.

Masterpact MTZ2/MTZ3 VSPO OFF-Position Locking Accessory

The OFF-position locking accessory is an optional accessory that can be mounted on the front of the device.

The OFF-position locking accessory can be fitted with either:

  • One keylock.

  • Two keylocks with identical keys or different keys.

The following types of keylocks can be fitted:

Ronis keylock

Profalux keylock

Castell keylock

Kirk keylock

For information on the accessory installation, consult instruction sheet NVE16146, available at the Schneider Electric website.

Locking the Masterpact MTZ2/MTZ3 Device Open with VSPO

For devices equipped with two keylocks, locking with one key is sufficient to lock the device in the open position.

Step

Action

1

Press and hold the opening pushbutton.

2

With the opening pushbutton pressed, turn the key counterclockwise to lock the device.

3

Remove the key and release the opening pushbutton.

4

Check that the device is locked in the open position and cannot be closed either locally with the closing pushbutton or remotely.

Unlocking the Masterpact MTZ2/MTZ3 Locked Open with VSPO

For devices equipped with two keylocks, locking with one key is sufficient to lock the device in the open position.

Step

Action

1

Put the key in the keylock.

2

Turn the key clockwise to unlock the device.

3

Press the closing pushbutton to close the device.

NOTE: The key remains captive in the keylock.

Locking the Masterpact Cradle in the Disconnected Position

The cradle can be locked in the disconnected position. When the cradle is locked in the disconnected position, the racking handle cannot be inserted.

The cradle can be locked in the disconnected position:

  • By up to three padlocks with shackle diameter 5–8 mm (3/16–5/16 in.).

  • By optional keylocks.

Keylocks can be used in addition to padlocks.

Cradle locking by padlock is always possible and does not require any accessory.

Locking a Masterpact MTZ2/MTZ3 Cradle in with VSPO

A cradle locking by keylock accessory can be fitted with either:

  • One keylock.

  • Two keylocks with identical keys or different keys.

The following types of keylocks can be fitted:

Ronis keylock

Profalux keylock

Castell keylock

Kirk keylock

For information on the accessory installation, consult instruction sheet NVE16142, available at the Schneider Electric website.

Locking a Masterpact MTZ2/MTZ3 Cradle with Padlocks

Step

Action

1

Check that the cradle indicator is in the disconnected position.

2

Pull out the padlocking tab.

3

Insert the padlock in the tab and close the padlock.

4

Press and hold down the opening pushbutton, then check that the racking handle cannot be inserted into the racking handle socket.

Unlocking a Padlocked Masterpact MTZ2/MTZ3 Cradle

Step

Action

1

Remove the padlock.

The tab retracts.

2

Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket.

Locking a Masterpact MTZ2/MTZ3 Cradle with Keylocks

For a cradle equipped with two keylocks, locking with one key is sufficient to lock the cradle in the disconnected position.

Step

Action

1

Check that the cradle indicator is in the disconnected position.

2

Turn the key counterclockwise to lock the cradle.

3

Remove the key.

4

Press and hold down the opening pushbutton, then check that the racking handle cannot be inserted into the racking handle socket.

Unlocking a Keylocked Masterpact MTZ2/MTZ3 Cradle

For a cradle equipped with two keylocks, both keys must be inserted in the keylocks to unlock the cradle.

Step

Action

1

Put the key in the lock.

2

Turn the key clockwise to unlock the cradle

NOTE: The key remains captive in the keylock.

3

Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket.

Locking the Masterpact MTZ2/MTZ3 Cradle in Any Position

The cradle can be locked in any position (connected, test, or disconnected position).

This locking function requires a mechanical adaptation of the cradle, explained in the following procedure.

When the cradle is locked, the racking handle cannot be inserted in the racking handle socket.

The cradle can be locked in any position:

  • By up to three padlocks with shackle diameter 5–8 mm (3/16–5/16 in.) as standard.

  • By one or two optional keylocks.

Keylocks can be used in addition to padlocks.

Converting the Masterpact MTZ2/MTZ3 Cradle for Keylocking

DANGER
HAZARD OF DEVICE FALLING
  • Be sure that lifting equipment has lifting capacity for the device being lifted.
  • Follow manufacturer’s instructions for use of lifting equipment.
  • Wear hard hat, safety shoes, and heavy gloves.
Failure to follow these instructions will result in death or serious injury.
NOTICE
HAZARD OF EQUIPMENT DAMAGE
The cradle must be securely fastened when installing or removing the device.
Failure to follow these instructions can result in equipment damage.

Step

Action

1

Make sure that cradle indicator is in the disconnected position

2

Remove the device from the cradle (see Removing Masterpact MTZ2/MTZ3 Device from the Cradle).

3

Insert the racking handle into the racking handle socket.

4

Rotate the latch to the front. The cradle can now be locked in any position.

NOTE: To return the cradle to locking only in the disconnected position, rotate the latch to its original position at the rear.

Latch position for locking in disconnected position.

Latch position for locking in any position.

Locking the Masterpact MTZ2/MTZ3 Safety Shutters

The shutters automatically block access to the main disconnects when the circuit breaker is in the disconnected, test, or fully withdrawn position.

The shutter lock is used to prevent connection of the circuit breaker or to lock the shutters in the closed position.

  • The safety shutters can be locked by a padlock on the front of the cradle .

  • The shutter can be locked with one padlock with maximum shackle diameter 5–8 mm (3/16–5/16 in.).

Not available on cradles with ArcBlok technology.

Locking the Mastepact MTZ Shutters with Shutter Position Indication and Locking Accessory

Step

Action

1

Pull out the padlock tab

2

Insert the padlock in the padlock tab and close padlock.

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