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                            • • • • • GE MMLB01 Multi-Finger Test Plug

                                      Overview

                                      MMLB01 is a multi-finger test plug from GE Vernova Midos series, matched with MMLG test blocks for power system protection secondary testing. It is misnamed as logic board; it is a dedicated test accessory rather than a control circuit boardGE Vernova. It safely isolates CT/PT circuits without disconnecting relay wiring during commissioning and fault inspection.

                                      Specifications

                                      • 28 test sockets compatible with 4mm shrouded retractable test probes
                                      • Comes with 6 shorting plug links for CT short-circuit protection
                                      • Finger-safe insulated housing to prevent electric shock hazards
                                      • Standard modular size matching MiCOM/Midos relay cabinet layout
                                      • Mechanical interlock design to avoid accidental live-line misoperation
                                      • Industrial plastic housing resistant to cabinet dust and mild corrosion

                                      Key Functions

                                      1. Insert into MMLG test block to open internal spring contacts and isolate protection circuits
                                      2. Enable secondary injection testing, signal monitoring and calibration of protective relays
                                      3. Provide CT shorting terminals to eliminate open-circuit high voltage risks during testing
                                      4. Keep original wiring intact, no cable removal required for routine maintenance
                                      5. Standardized test interface for consistent protection device troubleshooting workflow

                                      Compatible Equipment

                                      • GE MMLG01/MMLG02/MMLG03/MMLG04 test blocks
                                      • GE MiCOM, Midos series modular protection relays
                                      • Secondary injection test kits, multi-meter and signal analyzers

                                      Applications

                                      Power grid secondary protection systems:
                                      • Substation feeder, transformer and busbar protection panels
                                      • Power plant generator and auxiliary equipment relay cabinets
                                      • Industrial plant medium-voltage switchgear protection control cubicles

The structure and details of the product：