MasterPact MTZ Accessories: How to Replace MN/MX/XF Coils

MasterPact MTZ Accessories: How to Replace MN/MX/XF Coils

The MN (Undervoltage Release), MX (Shunt Trip), and XF (Closing Release) coils are key accessories for the remote control and protection functions of Schneider Electric’s MasterPact MTZ circuit breakers. Replacing these coils is a straightforward maintenance task that ensures continued reliable performance and system safety.

Preparation Before Replacement:

1. Power Off: Ensure the breaker is disconnected from all power sources and safely isolated.

2. Remove Front Cover: Use a screwdriver to remove the front panel of the breaker for access to the coil compartment.

3. Identify Coil Modules: Locate the MN, MX, or XF coil module inside the accessory compartment. Each coil is clearly labeled for easy identification.

Replacement Steps:

1. Disconnect Wiring: Carefully disconnect the wiring terminals from the existing coil module.

2. Unclip the Coil: Release the coil from its mounting clips or screws using a suitable tool.

3. Install New Coil: Position the new MN, MX, or XF coil into the same slot and secure it properly.

4. Reconnect Terminals: Match the terminal markings and reconnect the wiring as per the wiring diagram.

5. Verify Installation: Ensure all connections are tight and correctly positioned. Reattach the front cover.

Post-Replacement Check:

• Functional Test: Restore power and perform a functional test using a control signal to verify coil operation.

• Monitoring via EcoStruxure™: If applicable, use the EcoStruxure™ Power Commission software to validate the accessory status and confirm successful installation.

Replacing MN, MX, or XF coils helps maintain optimal breaker operation, especially in systems requiring frequent remote control or emergency tripping.