Masterpact MTZ1 Fixed and Drawout Devices

The diagram is shown with circuits de-energized, all devices open, connected and charged and relays in normal position.


Control Unit

Indication Contacts

NOTE: It is possible to add a second MX/MX diag&com or a MN/MN diag voltage release. The second MX diag&com voltage release can only be installed after the delivery of the circuit breaker. This is an after-sales adaptation.

Remote Operation*

NOTE: Maximum length of the two wires between A2–A3,/C20C3/C12/C13: 5 m (16 ft.).
For the maximum length of the wiring between the AC/DC power supply and the voltage release terminals A1–A3/C1–C3/C11–C13/D1–D2: see Shunt Close (XF), Shunt Trip (MX), and Undervoltage Release (MN) with Basic Coils.

Terminal Block Marking

Indication Contacts Terminal Bock


Control Unit Terminal Block

OF4 / OF3 / OF2 / OF1 : Open/closed indication contacts OF


Com :

ULP Communication

Cradle Contacts Terminal Block


UC1 :

Z1-Z4 Zone Selective Interlocking
M1 = MDGF module input

CD2 / CD1:

Disconnected position contacts


UC2 :

T1, T2 = Neutral External Sensors
M2, M3 = MDGF Module Input

CE3 /CE2 / CE1:

Connected position contacts


UC3 :

Voltage Connector (must be connected to the neutral with a 3P circuit breaker)


Test position contacts


UC4 :
M2C :

External Voltage Connector (PTE option)

2 Programmable Contacts (external relay) ext. 24 Vdc power supply required is not installed.


Remote Operation Terminal Block


Res: remote reset

Overcurrent Trip Indication Contact

Remote Reset



Overcurrent Trip Indication Contact (supplied as standard)


MN /MN diag:

Undervoltage Release Standard or Diagnostic


MX/MX diag&com:

Shunt Trip Standard or Diagnostic & Communicating


2nd MX/MX diag&com:

Shunt Trip Standard or Diagnostic


XF/XF diag&com:

Shunt Close Standard or Diagnostic & Communicating



Ready-to-Close Contact



Spring Charging Motor

NOTE: When communicating MX diag&com or XF diag&com accessories are used, the third wire (C3,A3, C13) must be connected even if the communication module is not installed.
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