GEC ALSTHOM MVAJ13D1GB0780A | Low-Burden Tripping Relay, Discontinued Spare
GEC ALSTHOM MVAJ13D1GB0780A | Low-Burden Tripping Relay, Discontinued Spare - Image 2
GEC ALSTHOM MVAJ13D1GB0780A | Low-Burden Tripping Relay, Discontinued Spare - Image 3

GEC ALSTHOM MVAJ13D1GB0780A | Low-Burden Tripping Relay, Discontinued Spare

  • Model: MVAJ13D1GB0780A
  • Brand: GEC ALSTHOM / ALSTHOM
  • Series: MVAJ low-burden tripping relay family
  • Core Function: Auxiliary tripping relay for protection and control circuits
  • Type: Low-burden tripping relay module
  • Key Specs: Low-burden coil design; relay output for trip/auxiliary signaling; panel or DIN-mount variants depending on version
Category:

Description

Key Technical Specifications

Parameter Value
Product Model MVAJ13D1GB0780A
Manufacturer GEC ALSTHOM / ALSTHOM
Product Type Low-burden tripping relay
Series Family MVAJ tripping relay series
Primary Application Protection relay output, trip signaling, auxiliary control
Coil Voltage Not universally published for this suffix; verify on nameplate
Contact Configuration Typically relay output; exact form depends on version
Contact Rating Not confirmed for this exact suffix; check OEM label
Mounting Panel or DIN-rail style depending on variant
Supply Type AC or DC coil possible; must confirm per unit
Condition New surplus / Refurbished tested / Used
Warranty 12 months

 

Product Introduction

GEC ALSTHOM MVAJ13D1GB0780A is a low-burden tripping relay used in legacy protection and control panels. It sits downstream of protection relays and converts a protection command into a reliable trip or auxiliary switching signal.Its main value is compatibility with older switchgear, generator protection, transformer protection, and feeder relay panels. The “low-burden” designation means the coil draws less current from the protection relay output, which helps avoid loading issues on older CT/VT or auxiliary circuits. Exact coil voltage, contact rating, and mounting style must be confirmed from the physical nameplate before installation.

Installation & Configuration Guide

Preparation (10 min)

  • Photograph the original relay nameplate, terminal labels, and wiring.
  • Confirm coil voltage, contact arrangement, and mounting type.
  • Verify system control voltage is within ±10% of the relay rating.
  • Prepare insulated tools, terminal labels, and ESD-safe handling.

Removal (5–10 min)

  • De-energize the control circuit where possible.
  • Mark each wire before removal.
  • Remove terminal screws or plug connector carefully.
  • Do not force the relay if it is panel-locked or socket-mounted.

Installation (10 min)

  • Confirm the new unit matches the original mounting footprint.
  • Install the relay and verify mechanical retention.
  • Reconnect terminals using the marked wiring list.
  • Double-check polarity if the coil is DC.

Power-On & Test (10 min)

  • Measure coil supply voltage before energizing.
  • Apply control voltage and observe relay operation.
  • Verify contact closure/opening with a multimeter.
  • Confirm trip signaling reaches the downstream breaker or auxiliary circuit.
  • Record coil voltage, contact response, and nameplate data.

 

Troubleshooting Quick Reference

Symptom Likely Cause First Check
Relay does not pick up Wrong coil voltage Compare nameplate vs. measured supply
Weak or inconsistent operation Low control voltage Measure voltage at relay terminals under load
Contacts do not switch Wiring error Verify COM/NO/NC against original labels
Relay chatters AC ripple or loose terminal Tighten terminals; check DC supply ripple
Overheating coil Continuous overvoltage Measure sustained coil voltage
Intermittent trip signal Oxidized contacts or loose wiring Inspect terminals; perform contact continuity test

Dimensions, Mounting & Wiring Notes

  • Dimensions: Not standardized across all MVAJ suffixes; measure H × W × D from the original unit.
  • Mounting: May be panel-mounted, socket-mounted, or DIN-rail compatible depending on version.
  • Terminal Notes: Label every wire before removal. Some versions use screw terminals; others use plug-in bases.
  • Wiring Caution: Do not assume coil polarity or contact mapping. Verify against the original relay and OEM documentation.

 

FAQ

Is MVAJ13D1GB0780A still available new?
Not as regular OEM stock. Units are typically new surplus, refurbished tested, or used. Condition is confirmed per batch.Can I replace it with any MVAJ relay?
No. The suffix matters. Coil voltage, contact form, mounting, and terminal layout may differ. Always match the nameplate.What systems use this relay?
It commonly appears in legacy protection panels, switchgear trip circuits, generator/transformer protection schemes, and auxiliary control circuits.I only have the part number — is that enough to order?
Not reliably. Send a nameplate photo, terminal photo, coil voltage, and mounting style before purchase.Do you test it before shipping?
Yes. Each unit undergoes visual inspection, nameplate verification, coil energization, contact continuity check, and terminal confirmation. Function is verified under test conditions.What is the lead time?
If in stock, shipment can usually be arranged within 1–3 business days. Non-stock items require separate confirmation.Is there a modern replacement?
Possible, but only after reviewing coil voltage, contact rating, burden, mounting, and panel wiring. A direct drop-in replacement is not guaranteed.

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