ALSTOM MVAJ23B1AB0757B – Heavy?Duty Auxiliary/Tripping Relay for Protection Panels

• Warranty: 365 days

• Lead time: 1 week if in stock; no more than one month at the latest

• Payment: 50% advance payment; full payment before delivery

• Express options: FedEx, UPS, DHL

• Packaging: anti?static, shock?absorbing export packing; relay shipped with protective case cover

• Heavy?duty attracted armature – Designed for trip/interlock duty in protection systems with fast pickup and robust mechanics.

• Multiple changeover contacts – Typically provides several volt?free C/O contacts for parallel signaling and control.

• Draw?out case – You might notice the Midos?pattern draw?out style that simplifies testing and replacement without disturbing panel wiring.

• Coil voltage flexibility – Common coils are 110/125 Vdc or 220/250 Vdc; matching the installed scheme is straightforward.

• Clear indication – Many MVAJ variants include mechanical flags for quick trip status at the panel (hand reset or self reset depending on code).

• IEC protection practice – Built for utility environments, typically aligned with IEC 60255 performance expectations.

Note: The exact coil voltage, contact arrangement, and reset/flag options are defined by the full code “MVAJ23B1AB0757B”. If you share a photo of the nameplate, we can confirm specifics before shipping.

• Medium and high?voltage switchgear protection panels (breaker trip/interlock)

• Substation control and automation cubicles for signaling and scheme logic

• Generator and transformer protection schemes (auxiliary trip, lockout assistance)

• Retrofit of legacy ALSTOM/AREVA/GE protection panels needing form?fit?function compatibility

• Reliability in trip duty: MVAJ units are known for consistent pick?up and strong contact pressure, even after years in service.

• Compatibility: Draw?out case and terminal pattern match existing protection panels in many cases, minimizing wiring changes.

• Procurement efficiency: Faster commissioning compared with re?engineering logic around a different relay family.

• Support and spares: We help confirm coil voltage, contact mapping, and any suppression accessories to avoid site delays.

One thing I appreciate is how maintenance techs can test these in a cradle without disturbing panel wiring. A utility customer told us they swapped in a like?for?like MVAJ in under 15 minutes during a planned outage—no terminal rework, just verify coil voltage and go.

• Panel/cabinet: Mount in a clean, ventilated protection cabinet; allow front clearance for draw?out handling.

• Wiring: Use ferruled conductors; confirm coil voltage on the nameplate before energizing; observe polarity for any DC suppression modules.

• Trip circuit health: Keep total loop resistance within scheme limits; apply surge suppression across inductive loads to protect contacts.

• Routine checks: Function test at intervals (often 6–12 months), verify contact resistance, clean dust, and check flag/reset operation.

• Spare strategy: Keep at least one spare relay with the same coil and contact configuration for critical feeders or transformers.

• Designed in line with utility protection practice and IEC 60255 performance concepts

• Typically CE?marked when supplied for the EU market

• RoHS applicability may vary with production batch; we can confirm upon request

• Supplied with a 365?day warranty

• Midos?style test block (e.g., ALSTOM/GE MMLG) for safe secondary testing

• Arc?suppression components (RC snubbers or diodes) for inductive loads across contacts

• Replacement terminal labels, case gaskets, and draw?out cradle hardware

If you can share the exact scheme requirement (coil voltage, number of C/O contacts, reset/flag preference), we’ll match it against MVAJ23B1AB0757B and ship the correct unit with test data.