ABB 1SAH100533R9900 MCRK040ATD is a compact four-pole mini contactor relay with four normally open contacts, screw terminals and a 24 V DC, 2 W coil.
£51.59
The ABB 1SAH100533R9900, also designated MCRK040ATD, is a compact four-pole mini contactor relay designed for switching control signals and small loads in industrial machinery, automation equipment and building-control systems. Its space-efficient construction makes it well suited to control panels where dependable operation is required within a limited installation area.
This DC-operated contactor relay incorporates four normally open auxiliary contacts and screw terminals for straightforward panel wiring. The contact arrangement supports signal distribution, control sequencing and auxiliary-load switching across a broad range of low-voltage control applications.
The MCRK040ATD features a 24 V DC control coil with 2 W holding and pull-in consumption. It can switch AC-15 control loads up to 6 A at 240 V AC and is suitable for mounting on a DIN rail or directly onto a mounting surface.
A mini contactor relay uses an electromagnetic coil to change the state of its auxiliary contacts. Applying the rated 24 V DC control voltage energises the MCRK040ATD and closes its four normally open contacts, allowing multiple control signals or auxiliary loads to be switched simultaneously.
The four-contact arrangement supports signal distribution, control sequencing and electrical interlocking. Compact dimensions, screw terminals and flexible mounting make the relay suitable for densely populated control panels and machine-control assemblies.
| Manufacturer | ABB |
|---|---|
| Series | MCRK Mini Contactor Relays |
| Model | MCRK040ATD |
| Order code | 1SAH100533R9900 |
| Product type | Mini contactor relay |
| Number of poles | 4 |
| Auxiliary contacts | 4NO |
| Control voltage | 24 V DC |
| Coil consumption | 2 W holding and pull-in |
| Rated operational current, AC-15 at 240 V | 6 A |
| Rated operational current, AC-15 at 400 V | 4 A |
| Rated operational current, AC-15 at 500 V | 2.5 A |
| Rated operational current, AC-15 at 690 V | 1.5 A |
| Rated operational current, DC-13 at 24 V | 5 A |
| Conventional free-air thermal current | 10 A |
| Rated auxiliary-circuit operational voltage | 690 V AC / 440 V DC |
| Rated insulation voltage | 750 V |
| Rated impulse withstand voltage | 6 kV |
| Mechanical durability | 10,000,000 operating cycles |
| Terminal type | Screw terminals |
| Protection rating | IP20 at terminals |
| Mounting type | DIN rail or wall mounting |
| Dimensions (W × H × D) | 45 × 48 × 68 mm |
| Net weight | 0.235 kg |
| Operating temperature | -40 °C to +70 °C |
| Storage temperature | -55 °C to +80 °C |
| Maximum operating altitude | 3,000 m |
| Standards | IEC/EN 60947-1, IEC/EN 60947-5-1, UL 60947-1 and UL 60947-5-1 |
It switches control signals and small auxiliary loads in industrial machinery, automation systems and electrical control panels.
The relay has four normally open auxiliary contacts, providing a 4NO configuration.
The MCRK040ATD requires a 24 V DC control supply.
The coil has an average holding and pull-in consumption of 2 W.
The compact contactor relay can be mounted on a compatible DIN rail or directly onto a mounting surface and connected through screw terminals.
ABB mini contactor relays combine compact construction, flexible mounting and dependable switching to support industrial machinery, automation systems and building-control applications.{ "@context": "https://schema.org/", "@type": "Product", "name": "ABB 1SAH100533R9900 MCRK040ATD Mini Contactor Relay 4NO 24 V DC", "sku": "1SAH100533R9900", "mpn": "MCRK040ATD", "brand": { "@type": "Brand", "name": "ABB" }, "category": "Mini Contactor Relays", "description": "ABB 1SAH100533R9900 MCRK040ATD is a compact four-pole mini contactor relay with four normally open contacts, screw terminals and a 24 V DC, 2 W coil.", "additionalProperty": [ { "@type": "PropertyValue", "name": "Auxiliary contacts", "value": "4NO" }, { "@type": "PropertyValue", "name": "Control voltage", "value": "24 V DC" }, { "@type": "PropertyValue", "name": "Coil consumption", "value": "2 W" }, { "@type": "PropertyValue", "name": "AC-15 rating at 240 V", "value": "6 A" }, { "@type": "PropertyValue", "name": "Protection rating", "value": "IP20 at terminals" } ] } { "@context": "https://schema.org", "@type": "FAQPage", "inLanguage": "en-GB", "mainEntity": [ { "@type": "Question", "name": "What is the ABB 1SAH100533R9900 used for?", "acceptedAnswer": { "@type": "Answer", "text": "It switches control signals and small auxiliary loads in industrial machinery, automation systems and electrical control panels." } }, { "@type": "Question", "name": "How many contacts does the MCRK040ATD have?", "acceptedAnswer": { "@type": "Answer", "text": "The relay has four normally open auxiliary contacts, providing a 4NO configuration." } }, { "@type": "Question", "name": "What control voltage does this contactor relay require?", "acceptedAnswer": { "@type": "Answer", "text": "The MCRK040ATD requires a 24 V DC control supply." } }, { "@type": "Question", "name": "What is the coil power consumption?", "acceptedAnswer": { "@type": "Answer", "text": "The coil has an average holding and pull-in consumption of 2 W." } }, { "@type": "Question", "name": "How is the ABB 1SAH100533R9900 installed?", "acceptedAnswer": { "@type": "Answer", "text": "The compact contactor relay can be mounted on a compatible DIN rail or directly onto a mounting surface and connected through screw terminals." } } ] }
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...