Jun172026
ALSTOM BGTR8HE 24491276A1004

ALSTOM BGTR8HE 24491276A1004 | Substation Protection System Rack Power Supply Module 24VDC Output DIN Rail Plug-In Unit – Field Service Notes

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Component Snapshot At-a-Glance Full Model: BGTR8HE 24491276A1004 Part Serial No: 24491276A1004 Alt. P/N: BGTR8HE 24491276A1005 (higher data storage variant); BGTR7HE (lower power compact version) Manufacturer: ALSTOM (later GE Grid Solutions, legacy power system protection platform) Product Series: BGTR series substation rack auxiliary power supply unit, matched to Midos draw-out relay cabinet backplane Hardware Type: Hot-swappable…

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Jun172026
MVAJ21T1GB0771B

ALSTOM MVAJ23T1GB0774B | Instant Cut-off High-Burden Trip Midos Relay T Anti-Capacitance Coil Long Remote Trip Circuits – Field Service Notes

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Component Snapshot At-a-Glance Model: MVAJ23T1GB0774B Alt. P/N: MVAJ23L1GB0774B (standard low-burden coil, no built-in RC surge suppression); MVAJ23B1GB0774B (standard high-burden coil, no transient immunity); MVAJ21 (integrated economiser resistance, not instant coil cut-off) Product Series: MVAJ Midos electromechanical high-security trip relay family, unified rack base footprint matching MCGG/MVAX/MVTT/MCTI protection relays Hardware Type: Full withdrawable plug-in attracted armature…

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Jun172026
MVAJ21T1GB0771B

ALSTOM MVAJ21T1GB0771B | Transient-Surge Economising Self-Reset Trip Midos Relay 110VDC Anti-Capacitance Long Cable Trip Circuits – Field Service Notes

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Component Snapshot At-a-Glance Model: MVAJ21T1GB0771B Alt. P/N: MVAJ21L1GB0771B (standard low-burden coil, no built-in surge suppression); MVAJ21B1GB0771B (medium-burden coil, high continuous DC draw); MVAJ53 (mechanical latch, no economiser circuit) Product Series: MVAJ Midos electromechanical trip/amplifier relay family, shared rack base footprint with MCGG/MVAX/MVTT/MCTI protection relays Hardware Type: Full withdrawable plug-in attracted armature trip relay, blue aluminum…

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Jun172026
MVAJ27T1FB0784D

ALSTOM MVAJ27T1FB0784D | Time Delayed Drop-off Mechanical Latching Midos Trip Relay Transient Suppression 110VDC Special Burden – Field Service Notes

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Component Snapshot At-a-Glance Model: MVAJ27T1FB0784D Alt. P/N: MVAJ27L1FB0784D (standard low-burden coil, no surge suppression); MVAJ27B1FB0784D (medium-burden coil); MVAJ53 (no internal drop-off delay) Product Series: MVAJ Midos electromechanical trip/lockout relay family, unified rack base footprint matching MCGG/MVAX/MVTT/MCTI protection relays Hardware Type: Full withdrawable plug-in latching trip relay, blue aluminum industrial Midos chassis, transparent front window with…

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Jun172026
MFAC34N1AA0001A

ALSTOM MFAC34N1AA0001A | Multi-Leg High Impedance Differential Midos Draw-out Relay Low-Burden 110VDC Busbar & Transformer Protection – Field Service Notes

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Component Snapshot At-a-Glance Model: MFAC34N1AA0001A Alt. P/N: MFAC34B1AA0001A (medium-burden coil variant, higher DC draw); MFAC14 (single-zone 2–4 leg compact differential); MCAG34 (circulating current balanced differential, different summation logic) Product Series: MFAC Midos static high impedance differential protection relay family, shared rack base footprint with MCGG/MVAJ/MCTI/MVTU relays Hardware Type: Full withdrawable plug-in static multi-infeed high impedance…

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Jun172026
MCTI40N1AB0751G

ALSTOM MCTI40N1AB0751G | 3-Phase Instantaneous Overcurrent Midos Draw-out Relay Low-Burden 110VDC Breaker Fail Protection – Field Service Notes

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Component Snapshot At-a-Glance Model: MCTI40N1AB0751G Alt. P/N: MCTI40F1AB0751F (medium-burden coil variant, higher DC draw); MCTI39 (2-phase only, missing C-phase monitoring); MCTI19 (single-phase compact unit) Product Series: MCTI Midos static instantaneous current detection relay family, unified rack base with MCGG/MVAJ/MVAX/MVTT protection relays Hardware Type: Full withdrawable plug-in static 3-phase instantaneous overcurrent relay, blue painted aluminum industrial…

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Jun172026
MVAJ21L1GB0771B

ALSTOM MVAJ21L1GB0771B | Economising Self-Reset Trip Midos Relay Low-Burden 110VDC Breaker Trip Logic – Field Service Notes

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Component Snapshot At-a-Glance Model: MVAJ21L1GB0771B Alt. P/N: MVAJ21B1GB0771B (medium-burden coil variant, higher continuous DC draw); MVAJ27 (fixed drop-off delay latch); MVAJ53 (mechanical hand-reset flag, no economiser circuit) Product Series: MVAJ Midos electromechanical trip relay family, unified rack base footprint with MCGG/MVAX/MVTT protection relays Hardware Type: Full withdrawable plug-in attracted armature trip relay, blue aluminum industrial…

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Jun172026
MCGG22L1CB0753E

ALSTOM MCGG22L1CB0753E | Single-Phase IDMT Overcurrent Midos Draw-out Relay Low-Burden 110VDC 1A CT – Field Service Notes

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Component Snapshot At-a-Glance Model: MCGG22L1CB0753E Alt. P/N: MCGG22B1CB0753E (medium-burden coil variant, higher DC draw); MCGG52 (2-phase + earth fault); MCGG62 (3-phase full set) Product Series: MCGG Midos static overcurrent protection relay family, shared rack base with MVAJ/MVAX/MVTT relays Hardware Type: Full withdrawable plug-in static single-phase overcurrent relay, blue aluminum industrial chassis, front DIP switch calibration…

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Jun172026
MBCI01N1AB0761B

ALSTOM MBCI01N1AB0761B | Symphony DCS Bus Communication Interface Module 24VDC Low-Burden Backplane Card – Field Service Notes

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Component Snapshot At-a-Glance Model: MBCI01N1AB0761B Alt. P/N: MBCI01B1AB0761B (medium-burden backplane power variant, higher rack draw); 3BE series (standalone discrete I/O, no backplane bus bridge) Product Series: ALSTOM Symphony Harmony / Symphony Plus DCS backplane communication interface family Hardware Type: Rack plug-in blue metal chassis bus bridge module, conformal coated PCB, front diagnostic LED bank, edge…

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Jun172026
MVAW11B1AB0513A

ALSTOM MVAW11B1AB0513A | Midos Draw-out Single-Phase Over/Undervoltage Static Protection Relay 110VDC Medium Burden – Field Service Notes

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Component Snapshot At-a-Glance Model: MVAW11B1AB0513A Alt. P/N: MVAW11L1AB0513A (low-burden coil variant, lower DC draw); MVUA11 (non-Midos panel mount voltage relay); MCGG series (current-only hardware, no AC voltage measurement logic) Product Series: MVAW Midos static voltage protection relay family, shared rack base footprint with MCGG/MVAJ/MVTT/MCTI relays Hardware Type: Full withdrawable plug-in static single-phase AC voltage relay,…

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