Product Description
Model: MMLG01B1AA0001C Manufacturer: Alstom (Former GEC Alsthom, protection product line now under Schneider Electric) Description: Multi-finger Test Block
MMLG01B1AA0001C is a protection relay test module of Alstom MML series, used together with MMLB test plug. It is installed inside relay panel and serves as interface for secondary CT / VT circuits. During relay maintenance & commissioning, technicians can isolate relay from primary circuit, short CT circuits and inject secondary test signals without removing hardwiring. It eliminates high voltage risk caused by CT open circuit and ensures operator safety. This legacy power protection spare part is obsolete. Available stock includes new surplus, used tested and refurbished units.
Technical Specifications
- Model: MMLG01B1AA0001C
- Type: Multi-finger Test Block
- Independent Circuits: 14 circuits (28 terminals)
- Continuous Current Rating: 20A for CT/VT secondary circuit
- Voltage Rating: 300V AC/DC
- Matching Accessory: MMLB Test Plug
- Mounting: M-series modular mounting, installed adjacent to protection relay
- Circuit: CT current transformer & VT voltage transformer secondary circuit
- Spare Status: Obsolete
- Environment: Indoor protection panel
Application
- Secondary test interface matched with Alstom protection relays in power substation & power plant relay panels;
- Periodic commissioning and troubleshooting of protection relays, isolate relay and inject test signals safely;
- Short CT circuit safely to prevent dangerous high voltage from CT open circuit during maintenance;
- Spare replacement and retrofit for legacy protection systems of power grid, thermal & hydro power plants;
- Cooperate with MMLB test plug for fast switching and testing of protection circuits.
Related MML Series Models
- MMLG01B1AA0001C: Standard 14-circuit test block
- MMLB: Matching MML Test Plug
- MMLG02: Multi-circuit test terminal block of MML series
- MMLG03: Extended test block
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