ALSTOM IR139-1 Protective/Interface Relay – Reliable signaling and isolation for power and control panels

The ALSTOM IR139-1 is a robust relay module used in switchgear, turbine auxiliaries, and process control cabinets where fast, dependable isolation of signals is needed. From my experience, it’s often selected as a drop-in replacement in legacy ALSTOM/GE Alstom panels when you need clean, voltage-free contacts for trip, alarm, or interlocking circuits. One thing I appreciate is how straightforward it is to integrate—wiring is conventional, status is easy to check, and you don’t have to fight a steep learning curve.

Order Placement Process and Guarantees

• Warranty: 365 days from delivery
• Lead time: In-stock typically ships in 1 week; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL
• Each unit is function-checked before dispatch, with packing suitable for long-haul transport.

Key Features

• Fast, clean signal isolation – Provides voltage-free contacts to separate field circuits from your protection or DCS/PLC input cards.
• Rugged industrial design – Built for continuous operation in substation and plant cabinets; typically tolerant to electrical noise common in MV/HV environments.
• Simple retrofit – You might notice that terminal layout and mounting are friendly for panel upgrades, reducing on-site rework.
• Status indication – Local LED indication is commonly available, which makes commissioning faster and fault-finding less painful.
• No programming required – It acts as a deterministic relay interface; in many cases that means fewer variables during FAT/SAT.
• Compatible with standard wiring – Works with typical 2.5 mm² control wiring; screw or cage-clamp terminations depending on the base.

Technical Specifications

Application Fields

The IR139-1 is commonly used in:

• Substation protection panels for breaker trip and close interlocks
• Power plant auxiliaries—fans, pumps, and valve actuation circuits
• Turbine/generator control cabinets as an interface between field limits and the main controller
• Process industry MCCs for alarm grouping and clean contact handoff to PLCs

A maintenance supervisor told us their team swapped older mixed relays for IR-series units in a 6.6 kV switchboard; wiring stayed almost identical and commissioning time dropped by half a day. That seems to be typical when a site standardizes on one relay footprint.

Advantages & Value

• Reliability – Designed for 24/7 operation; fewer nuisance trips under electrical noise compared with generic relays.
• Compatibility – Plays nicely with standard PLC/DCS DI cards and protection schemes; no special tools needed.
• Lower lifecycle cost – Simple device, fewer configuration steps, easy to stock; reduces downtime risk.
• Technical support – We help match coil voltage and contact configuration to your exact panel drawing, so you receive the right variant the first time.

Installation & Maintenance

• Cabinet standards – Install in a dry, clean control cabinet (IEC/UL panels). Provide ventilation to keep internal air within typical 55 °C max.
• Wiring – Use ferruled conductors; tighten to the recommended torque on terminals. Keep control wiring separated from power cables to reduce EMI.
• Safety – De-energize the panel before service. Verify coil voltage on the nameplate matches your supply.
• Routine checks – Function-test contacts during scheduled outages. Inspect for loose terminals; clean dust with dry air. No firmware updates required for this type of relay.
• Spares – Keeping at least 10% spares per switchboard section is a practical policy for critical applications.

Quality & Certifications

• CE conformity typically applicable for industrial control equipment
• RoHS compliance depends on production batch and vintage; we can confirm per serial number
• Manufacturer’s quality systems aligned with ISO 9001 practices (typical for ALSTOM Grid-era products)
• Supplier warranty: 365 days replacement/repair coverage

Need help confirming the exact IR139-1 variant (coil voltage, contact form, mounting)? Share a photo of the rating label or your panel drawing, and we’ll match it before shipment.