ABB MCRC-0-31-AT-WL mini contactor relay

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Product Overview

The ABB MCRC-0-31-AT-WL is a mini contactor relay in ABB’s M series, featuring a DC-operated coil and a contact configuration of 3 NO + 1 NC (three normally open plus one normally closed contacts). The “WL” suffix indicates that the coil is designed with extended operating limits, meaning it can reliably operate under a wider range of supply voltage fluctuations (±30 %) around its nominal control voltage. According to ABB documentation, the nominal coil voltage is 125 V DC with ±30 % tolerance.Ita Sacchi+2ABB搜索+2

This type of mini contactor relay is intended for control or switching of small control signals, logic circuits, auxiliary control, interlocking, etc., combining compactness with dependable performance.

Key Technical Specifications

Below is a summary of the typical or reference specifications drawn from ABB’s datasheets and manuals (for this model or closely related models):

Advantages & Key Features

1. Compact Size / Space Efficiency
   The miniature form factor allows side-by-side installation in control panels, saving DIN rail or panel space.ABB Library+2Ita Sacchi+2

2. Extended Coil Operating Range (WL version)
   The “WL” variant can tolerate coil supply voltage deviations (±30 %) while maintaining reliable operation. This enhances resilience against voltage fluctuations.Ita Sacchi+2ABB搜索+2

3. Flexible Contact Combination
   The 3 NO + 1 NC layout offers versatile switching logic, suitable for different control and feedback circuits.

4. Reliability and Robust Design
   As part of ABB’s M series, the design incorporates insulation safety, noise resistance, and durability for industrial contexts.ABB Library+2RS Components+2

5. Modular / Accessory-friendly System
   Compatible with auxiliary contact blocks, timers, interlock accessories, and can be arranged in various combinations.ABB Library+1

6. Flexible Mounting & Easy Maintenance
   Supports DIN-rail or wall mounting. Standard screw terminals make wiring and replacement straightforward.Ita Sacchi+1

Typical Application Fields

This kind of mini contactor relay (like MCRC-0-31-AT-WL) is typically used in:

• Industrial automation control systems for signal control / switching

• Low-power control circuits (PLC outputs, logic control)

• Building automation, electrical distribution, and control panels

• Elevators, HVAC systems, lighting control systems

• Monitoring, alarm, security system switching functions

• DCS / PLC control cabinets as auxiliary relay elements

• Signal isolation / switching between control subsystems

Usage Precautions & Recommendations

1. Adhere to the Specified Coil Voltage Range (±30 %)
   Even for the WL version, there is a limit to allowable deviation. Long-term operation outside this range may degrade coil life or cause erratic behavior.

2. Correct Wiring & Terminal Use
   Follow terminal labeling and wiring instructions. Tighten even unused terminal screws to maintain mechanical stability and avoid accidental contact.

3. Suppress Voltage Spikes / Electromagnetic Interference (EMI)
   For DC coils, consider using suppression devices (diodes, RC snubbers) to mitigate back-EMF or transient disturbances.

4. Ambient Conditions & Environment
   Ensure the device operates in an environment with acceptable temperature, humidity, dust control, and minimal corrosive atmosphere.

5. Periodic Testing & Inspection
   In long-term installations, perform periodic energizing tests, check contact resistance, and inspect for signs of contact wear or carbonization.

6. Have Backup Units Available
   In critical-control systems, keep spare relay modules for rapid field replacement to reduce downtime.

7. Ensure Compatibility with Peripheral Components
   If used with auxiliary contact blocks, thermal relays, timers, or other control modules, confirm compatibility in terms of voltage, current, mechanical mounting, and wiring layout.

The structure and details of the product：

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