Jun172026
MFAC14K1AA0001A

ALSTHOM MFAC14K1AA0001A | High Impedance Differential Midos Draw-out Busbar Transformer Protection Relay – Field Service Notes

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Component Snapshot At-a-Glance Model: MFAC14K1AA0001A Alt. P/N: MFAC14B1AA0001A (medium-burden coil variant, higher DC draw); MCAG14 (alternate high impedance frame, different CT burden handling); MCGG series (overcurrent only, no differential zone comparison) Product Series: MFAC Midos static high impedance differential protection relay family, shared rack base with MCGG/MVAJ/MVTT relays Hardware Type: Full withdrawable plug-in static high…

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Jun172026
MCGG62N1CB0753F

ALSTHOM MCGG62N1CB0753F | 3-Phase IDMT Overcurrent Midos Draw-out Relay Instantaneous High-Set MV Feeder Protection – Field Service Notes

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Component Snapshot At-a-Glance Model: MCGG62N1CB0753F Alt. P/N: MCGG62B1CB0753F (medium-burden coil variant, higher DC draw); MCGG52 (2-phase + earth fault, missing third phase measurement); MCGG82 (3-phase + residual earth fault) Product Series: MCGG Midos static numerical overcurrent relay family, unified rack base footprint matching MVAJ/MVAX/MCTI relays Hardware Type: Full withdrawable plug-in static 3-phase overcurrent protection relay,…

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Jun172026
MAVS01L1AB0751D

ALSTHOM MAVS01L1AB0751D | Variable Speed Auxiliary Midos Draw-out Relay Turbine Motor Frequency Speed Monitoring – Field Service Notes

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Component Snapshot At-a-Glance Model: MAVS01L1AB0751D Alt. P/N: MAVS01H1AB0751E (high-burden coil variant, higher DC draw); MCHN series (undercurrent only, no frequency speed measurement) Product Series: MAVS Midos static speed/frequency monitoring relay family, shared rack base with MCGG/MVAJ/MVTT protection relays Hardware Type: Full withdrawable plug-in static frequency/speed detection relay, blue painted aluminum industrial chassis, transparent front adjustment…

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Jun172026
MVAJ53H1LB0856A

ALSTHOM MCTI40F1AB0751F | 3-Phase Instantaneous Overcurrent Midos Draw-out Relay Breaker Fail Protection – Field Service Notes

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Component Snapshot At-a-Glance Model: MCTI40F1AB0751F Alt. P/N: MCTI40N1AB0751G (low-burden coil variant, different DC draw); MCTI39 (2-phase only, no full 3-phase monitoring); MCTI19 (single-phase compact unit) Product Series: MCTI Midos instantaneous current detection relay family, shared rack base with MCGG/MVAJ/MVAX protection relays Hardware Type: Full withdrawable plug-in static 3-phase instantaneous overcurrent relay, blue painted aluminum industrial…

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Jun172026
VAJX11BP5243BA

ALSTHOM VAJX11BP5243BA | Compact Self-Reset Auxiliary Plug-In Relay 110VDC Protection Panel Interlock – Field Service Notes

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Component Snapshot At-a-Glance Model: VAJX11BP5243BA Alt. P/N: VAJX11DP5243BA (low-burden coil variant, different DC draw); VAJX13 (mechanical hand-reset latch version); MVAJ series (Midos draw-out rack form factor, incompatible base) Product Series: VAJX compact plug-in auxiliary relay family, standard panel flush mount, separate from Midos draw-out relay lineup Hardware Type: Fixed panel mount attracted armature electromechanical auxiliary…

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Jun172026
MVAJ53H1LB0856A

ALSTHOM MVAJ53H1LB0856A | High-Burden Hand-Reset Midos Draw-out Trip Relay 110VDC Breaker Lockout – Field Service Notes

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Component Snapshot At-a-Glance Model: MVAJ53H1LB0856A Alt. P/N: MVAJ53D1LB0856A (low-burden coil variant, different DC draw); MVAA14 (electrical reset no mechanical flag); MVAJ23 (smaller contact stack, narrower rack footprint) Product Series: MVAJ Midos draw-out tripping relay family, shared rack base with MCGG/MVAX/MVTT protection relays Hardware Type: Full withdrawable plug-in hinged armature trip relay, yellow aluminum industrial chassis,…

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Jun172026
MVTT14B1BA0773C

ALSTHOM MVTT14B1BA0773C | Thermal Overload Midos Draw-out Protection Relay Motor Winding Temperature Trip – Field Service Notes

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Component Snapshot At-a-Glance Model: MVTT14B1BA0773C Alt. P/N: MVTT14D1BA0773C (low-burden DC coil variant, different current draw); MCGG series (overcurrent only, no RTD thermal measurement) Product Series: MVTT Midos static thermal protection relay family, unified rack base with MCGG/MVAJ/MVAX relays Hardware Type: Full withdrawable plug-in static RTD temperature relay, yellow aluminum chassis, front rotary temperature adjustment dial…

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Jun172026
3BE101

ALSTHOM 3BE101 | 24VDC Digital I/O Rack Mount Control Module ALSPA DCS Power Plant Refinery – Field Service Notes

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Component Snapshot At-a-Glance Model: 3BE101 Alt. P/N: No direct factory cross-reference; ALSPA series 3BE099 / 3BE102 are expanded I/O variants with different channel counts Product Series: ALSPA GEC ALSTHOM legacy distributed DCS control system Hardware Type: Rack/DIN rail plug-in digital I/O module, conformal coated PCB, metal front mounting bracket Key Feature: 16 isolated digital inputs…

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Jun172026
MVAA14B1AA0785C

ALSTHOM MVAA14B1AA0785C | Electrical Reset Auxiliary Midos Draw-out Relay 110/125VDC Medium Burden – Field Service Notes

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Component Snapshot At-a-Glance Model: MVAA14B1AA0785C Alt. P/N: MVAA14D1AA0785C (low-burden coil variant, different DC draw); MVAA11 (self-reset no latch); MVAA13 (hand-reset mechanical latch) Product Series: MVAA Midos auxiliary relay family, shared rack base footprint with MCGG/MVAJ/MVAX protection relays Hardware Type: Full withdrawable plug-in electromechanical auxiliary relay, yellow aluminum industrial chassis, transparent front inspection cover Key Feature:…

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Jun172026
MVUA11B1BD0784B

ALSTHOM MVUA11B1BD0784B | Single-Phase AC Undervoltage Midos Draw-out Protection Relay Substation Motor Load – Field Service Notes

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Component Snapshot At-a-Glance Model: MVUA11B1BD0784B Alt. P/N: MVUA11D1BD0784B (low-burden coil variant, different DC winding draw); MVAX series (DC trip supervision, incompatible AC measurement logic) Product Series: MVUA Midos draw-out AC voltage protection relay family, shared rack base footprint with MCGG/MVAJ relay lineup Hardware Type: Full withdrawable plug-in static single-phase AC undervoltage relay, yellow aluminum industrial…

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