The grease to use is 87636

About the detailed maintenance request and process ,you can check below maintenance guide to determine the maintenance level and check the detailed procedure in maintenance procedure

NT/NW maintenance guide

LVPED508016EN–03

Masterpact NT and NW Maintenance guide | Schneider Electric (se.com)

NT/NW maintenance procedure

HRB16483EN-02

MasterPact NT/NW - Basic and Standard End-User Maintenance Procedures | Schneider Electric

HRB16483EN-02

MTZ maintenance guide

DOCA0099EN-04

Masterpact MTZ IEC Circuit Breakers and Switch-Disconnectors - Maintenance Guide | Schneider Electric (se.com)

MTZ maintenance procedure

DOCA0103EN-06

Pact Series (schneider-electric.com)

Released for: Schneider Electric UK