Product Core Brief

• Model: MVAW11B1AB9007A
• Brand: ALSTOM / GE Vernova
• Series: ALSTOM MVAW11 Auxiliary/Tripping Relay Family
• Core Function: Electromechanical auxiliary/tripping relay used to interface protection outputs with breaker trip coils, interlock chains, alarm circuits, and DC control circuits.
• Product Type: Auxiliary Relay / Tripping Relay / Interposing Relay
• Key Specs: DC or AC coil options | Dry changeover contacts | Draw-out case | Mechanical flag/indicator | No communication interface
• Condition: New Original / New Surplus

Product Introduction

ALSTOM MVAW11B1AB9007A is a heavy-duty electromechanical auxiliary/tripping relay from the ALSTOM MVAW11 relay family, now referenced under GE Vernova. It is designed for protection and switchgear panels where a robust relay is required between protective devices and circuit breaker trip circuits, interlock chains, or auxiliary DC control circuits.

The relay is housed in a draw-out case with rear terminal connections, allowing the relay element to be withdrawn for testing or replacement without disturbing permanent panel wiring. It provides dry changeover contacts for tripping, alarm signaling, permissive control, and interlocking duties. A mechanical flag or indicator is commonly fitted to confirm operation during commissioning and post-fault inspection.

This unit is a pure electromechanical relay with no firmware, no configuration software, and no communication ports. Some third-party spare listings describe MVAW11B1AB9007A as a control module with 4–20 mA / 0–10 V analog outputs and RS485/RS232 communication; that description is inconsistent with the MVAW11 auxiliary relay family and should not be used as the sole basis for replacement. Always verify the installed nameplate, coil voltage, contact arrangement, and panel drawing before procurement.

Key Technical Specifications

Quality Control Process

• Visual and code check: Confirm MVAW11B1AB9007A labeling, case condition, terminals, flag/indicator, and front hardware.
• Coil verification: Confirm coil voltage (DC or AC) matches the installed nameplate and panel drawing before energizing.
• Contact operation check: Verify pickup, drop-off, contact bounce behavior, and changeover contact operation under rated coil voltage.
• Draw-out mechanism check: Confirm smooth insertion/withdrawal and correct rear terminal engagement.
• Final packing: Record test results, apply asset labels, and ship with terminal and case protection.

Replacement Pitfall Guide

❗ Confirm coil voltage from the nameplate. MVAW11 variants may use different DC or AC coil ratings; applying the wrong voltage can prevent operation or damage the coil.

❗ Verify contact arrangement and current rating. The number of changeover contacts and their making/breaking capacity must match the trip, interlock, and alarm circuits.

❗ Do not treat it as an analog signal module. MVAW11B1AB9007A is an electromechanical auxiliary relay and does not provide 4–20 mA, 0–10 V, RS485, or RS232 functions.

❗ Check draw-out case compatibility. The replacement must match the case footprint, terminal layout, and mounting cutout to avoid panel rewiring.

Keep these in mind and you’ll cut 90% of rework time.

Compatibility Matrix & Benchmarks

• Typical use: MV/HV substations, switchgear OEM and retrofit, feeder/transformer/generator protection panels, DC trip circuits, intertripping schemes, and auxiliary control panels.
• Key verification points: MVAW11B1AB9007A part number, coil voltage (DC/AC), contact configuration, draw-out case type, and panel wiring drawing.