ABB CR-M4LS – 4-pole relay socket for reliable DIN-rail and panel installations

From my experience, the ABB CR-M4LS is the go-to socket when you need a sturdy, straightforward base for 4-pole CR-M plug-in relays. It’s built for control panels that run every day without fuss—clean wiring, solid retention, and easy service. You might notice that it fits nicely in tight cabinets and keeps terminals accessible, which is a small thing but matters during commissioning.

Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: typically 1 week if in stock; no more than 1 month at the latest
• Payment terms: 50% advance; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Designed for ABB CR-M4 relays (4 C/O) – Ensures proper fit and contact alignment for 4-pole miniature plug-in relays.
• Screw-clamp terminals – Secure wire connection for control wiring; typically suitable for 0.5–2.5 mm² (AWG 20–14).
• DIN-rail and panel mounting – Snaps on 35 mm rail or fastens with screws, so it adapts to most panel layouts.
• Hold-down/retaining clip support – Keeps the relay seated under vibration; handy in machine cabinets.
• Marker and labeling space – Clear terminal identification makes maintenance faster in many cases.
• Finger-safe terminal design – Improves safety during live panel service (when following proper lockout procedures).
• Accessory-ready – Typically supports coil suppression modules (RC/diode/varistor) to protect upstream electronics.

Technical Specifications

Application Fields

The CR-M4LS is well-suited for control panels across machinery, OEM assemblies, HVAC equipment, small process skids, and utility support systems. One thing I appreciate is how it simplifies retrofits—if you’re standardizing on ABB CR-M relays, this socket keeps wiring consistent across machines and cabinets.

• Machine control cabinets and conveyor panels
• Pump stations and compact water treatment skids
• HVAC air-handling units and boiler control boards
• Packaging, printing, and light assembly lines
• General I/O interposing relay banks in PLC panels

Advantages & Value

• Reliability in daily operation – Stable retention and clear terminal layout reduce wiring faults, especially during quick changes.
• Compatibility – Purpose-built for ABB CR-M4 relays, which reduces part mix-ups and avoids awkward fit issues.
• Cost control – Reusable socket with easy relay swap helps minimize downtime and maintenance cost.
• Panel efficiency – DIN-rail snap-in saves build time; labeling space helps technicians trace I/O faster.
• Support and continuity – ABB’s long-running CR-M platform means replacements are typically easy to source.

Installation & Maintenance

• Mounting: Install on 35 mm DIN-rail or fasten to a flat panel. Keep adequate spacing for wire bend radius and heat dissipation.
• Wiring: Use ferrules where possible; tighten screws to the recommended torque (typically around 0.5–0.6 Nm).
• Environment: Enclose in a ventilated cabinet to IEC standards; avoid excessive vibration and moisture ingress.
• Protection modules: For DC coils, consider a diode or varistor; for AC coils, RC snubbers are common to reduce coil kickback.
• Routine checks: Re-torque terminals during scheduled maintenance, clean dust with a dry, anti-static brush, and inspect retaining clips.
• Replacement: If contacts show abnormal heating (discoloration on terminals), check load sizing and replace the mated relay promptly.

Quality & Certifications

The CR-M platform typically carries CE and cURus approvals, complies with RoHS/REACH, and is manufactured under ISO-certified quality systems. Warranty from us is 365 days, which in most cases covers normal industrial use as long as wiring and loads are within spec.