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Help CenterALSTOM VAJX11BP5243BA – High‑speed Auxiliary/Trip Relay for Protection Panels
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Warranty: 365 days
Lead time: 1 week if in stock; no more than 1 month at the latest
Payment: 50% advance payment, full payment prior to delivery
Express delivery: FedEx, UPS, DHL
High-speed trip duty – Designed for protection schemes where milliseconds matter; typically used to operate breaker trip coils or seal-in circuits.
Heavy make/break capability – Handles inductive loads reliably, which you’ll notice reduces nuisance contact wear in many cases.
Dry contact outputs – Clean changeover contacts suitable for low-level signalling and higher duty trip circuits.
Proven VAJ platform – A long-standing ALSTOM design still favored for retrofit projects where compatibility and predictable performance are key.
Panel/draw-out mounting – Typically supplied in a flush-mount/draw-out case with screw terminals for straightforward panel integration and service.
Coil options for DC control – Commonly 110 V DC in utility panels; other coils exist across the VAJ family, so we confirm against the relay label before shipping.
| Brand / Model | ALSTOM VAJX11BP5243BA (VAJ series auxiliary/tripping relay) |
| HS Code | 8536.49 (Relays, for voltage > 60 V) |
| Power Requirements | DC coil, typically 110 V DC across VAJ builds; confirm coil voltage from product label |
| Signal I/O Types | Coil input; dry contact outputs (changeover contacts common to VAJ series) |
| Communication Interfaces | None (discrete relay) |
| Installation Method | Panel/flush mounting in draw-out case; screw terminals for wiring |
| Operating Temperature | Typically −10 to +55 °C for VAJ family relays |
| Dimensions & Weight | Approx. 170 × 110 × 160 mm; ~2–3 kg (varies by exact variant) |
You’ll typically see the VAJ series in transmission and distribution substations, power plant switchboards, industrial MCCs, and OEM protection panels. Common tasks include trip coil actuation from protective relays, breaker fail and seal-in logic, interlocking, DC control signal duplication, and alarm fan-out. One thing I appreciate is how consistently it behaves with inductive loads in breaker trip circuits—saves time during FAT/SAT.
Reliability in protection duty – Built for frequent operations and high inrush, which seems to reduce post-commissioning tweaks.
Compatibility – Good drop-in fit for ALSTOM/AREVA legacy panels; simplifies retrofit timelines.
Lifecycle cost – Durable contacts and straightforward spare parts mean fewer outages and lower maintenance in many cases.
Support – We verify coil voltage and contact configuration against the tag before shipment to avoid site mismatches.
Mounting – Install in a clean, ventilated control cabinet; allow adequate depth for the draw-out case and front wiring access.
Wiring – Use appropriately rated DC control wiring (commonly 1.5–2.5 mm²). Observe coil voltage/polarity for DC. Add a diode or RC snubber across the coil to reduce contact arcing.
Safety – Isolate the DC control supply before service. Verify trip circuits are de-energized and tagged out.
Routine checks – Test pickup/dropout annually, inspect terminals for tightness, clean dust from the case/contacts, and measure contact resistance if switching critical trip duty.
Spares – Keep at least one identical relay on hand per panel section. From customer feedback, a spare reduces outage restoration by 30–60 minutes during fault investigations.
Manufactured under ISO 9001 quality systems (typical for ALSTOM grid products).
CE conformity typically applicable for panel components; RoHS conformity where required by region.
One-year warranty provided by us (365 days).
Quick note from a recent retrofit: a utility client replacing mixed auxiliary relays reported the VAJ unit latched and reset consistently during trip circuit supervision tests—no bounce or nuisance alarms—so the commissioning team finished early. That kind of predictable behavior is why this model remains a safe choice for protection panels.
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