ABB 1SAH220457R9900 miniature contactor relay

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Product Overview

The ABB 1SAH220457R9900 corresponds to the MCRC031ATWL mini contactor relay. It is a 4-pole relay (4 contact poles) with screw terminal connections and a DC coil. It is designed for compact installations where reliable switching of control signals is required.Ita Sacchi+2ABB Group+2

This model features an extended operating limits coil (“WL”), which allows it to tolerate control voltage fluctuations (125 V DC ±30 %) more robustly.Ita Sacchi+2ABB Group+2 It supports both DIN-rail mounting and wall mounting options.Ita Sacchi+1

Technical Specifications

Advantages & Key Features

1. Compact Form Factor / Space-Saving Design
   Allows close, side-by-side mounting in cabinets, ideal for dense control panels.Ita Sacchi+2ABB Group+2

2. Extended Limit Coil (WL Version)
   Better tolerance to control voltage fluctuations, improving operational reliability under unstable supply conditions.Ita Sacchi+2ABB Group+2

3. Adequate Control Load Switching Capability
   Capable of switching up to 6 A / 240 V in AC-15 duty, making it suitable for more demanding control circuits.Ita Sacchi+1

4. Flexible Contact Configuration
   The 3 NO + 1 NC arrangement offers flexibility for control and feedback logic.

5. Standardized Mounting Options
   Compatible with DIN-rail or wall mounting to suit different installation environments.Ita Sacchi+1

6. Brand Reliability & Support
   As an ABB product, it benefits from ABB’s global support, documentation, and quality assurance.

Application Areas

The MCRC031ATWL (1SAH220457R9900) mini contactor relay is typically used in:

• Industrial automation for signal control and switching

• Control panels (PLC, DCS) as auxiliary or control relays

• Building automation and building control systems

• Lighting, ventilation, HVAC control systems

• Security, alarm, and monitoring systems

• Machine control systems for logic / signal circuits

• Electrical distribution / control cabinets for low-power control switching

Precautions & Recommendations

1. Maintain Coil Voltage Within Specified Range
   Although it tolerates ±30 %, prolonged operation outside safe boundaries may degrade coil life or impair switching performance.

2. Adhere to Terminal Markings & Wire Connections
   Ensure correct wiring of NO, NC, coil, and other terminals, and tighten connections properly.

3. Use Noise Suppression & Shielded Wiring
   Consider adding suppression devices (e.g. diodes, RC snubbers) and use shielded cables to reduce interference, particularly for DC coils.

4. Environmental Conditions
   Avoid exposure to excessive heat, humidity, dust, corrosive atmospheres. Ensure ventilation in control enclosures.

5. Periodic Inspection & Testing
   Perform regular energization tests, check contact resistance, and inspect contacts for signs of wear or oxidation.

6. Stock Spare Units
   For critical systems, have spare relays on hand to minimize downtime in case of failure.

7. Plan Layout & Mounting in Advance
   When designing control cabinets, reserve space for DIN-rail or wall mounting and plan wiring channels for easy access.

The structure and details of the product：

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