Masterpact MTZ Device Installation

Masterpact MTZ devices can be supplied either from the top or from the bottom without degrading performance, in order to facilitate connection when installed in electrical equipment.

Mounting the Circuit Breaker

The weight of the device must be distributed uniformly over a rigid mounting surface such as rails or a base plate.

This mounting plane must be perfectly flat (tolerance on support flatness: 2 mm [0.08 in.]).

This eliminates any risk of deformation which could interfere with correct operation of the circuit breaker.

Masterpact MTZ devices can also be mounted on a vertical plane using special brackets.

Mounting on Rails

Mounting with Vertical Brackets

Masterpact MTZ Position in Electrical Equipment

Only one position is authorized.

Electrical Equipment Partitions for Masterpact MTZ Devices

Sufficient openings must be provided in partitions to maintain good air circulation around the circuit breaker. Any partition between upstream and downstream connections of the device must be made of non-magnetic material.

For high currents, 2500 A and above, the metal supports or barriers in the immediate vicinity of a conductor must be made of non-magnetic material [1].

Metal barriers [2] through which a conductor passes must not form a magnetic loop.

[1] Non-magnetic material

[2] Metal barriers

Masterpact MTZ Electrical Equipment Busbars

Creating a magnetic loop around a conductor, (via the busbar support for example), must be strictly avoided.

To avoid this:

  • Either the busbar supports (A) and/or their mounting screws (B) must be made of non-magnetic materials.

  • Maintain minimum distances for control wires (C) and busbar (D).

A) Busbar supports

B) Busbar support screws

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