GEC ALSTHOM VAJX11BP5243BA Trip Relay for Protection Panels
ALSTOM VAJX11BP5243BA Trip Relay for Protection Panels
The ALSTOM VAJ series has long been a go-to for robust tripping and auxiliary functions in protection schemes.
The model VAJX11BP5243BA fits that lineage: a fast, heavy-duty relay typically used to drive circuit breaker trip coils, seal-in logic, and interlock signals in substations and industrial switchgear.
From my experience, it drops right into legacy ALSTOM/AREVA panels and tends to play nicely with modern retrofit cabinets too, which keeps project risk low.
Key Features
VAJX11BP5243BA
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.
Technical Specifications
Brand / Model ALSTOM VAJX11BP5243BA (VAJ series auxiliary/tripping relay)
VAJX11BP5243BA
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)
Application Fields
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.