Call Us Today 01706 242050
MERSEN FUSE IEC UL508 Switch 80A 3p DM M803DM

MERSEN FUSE IEC UL508 Switch 80A 3p DM M803DM

Mersen M803DM UL508 non-fused door mounted disconnect switch with an 80 A current rating, 600 V AC rating and three-pole configuration for industrial electrical isolation.

SKU: M803DMMPN: M803DM
Price
List Price £103.08 ex VAT
Your Price (ex VAT)
£103.08
Manufacturer Lead Time Please contact us for a delivery time before you order
Get the best trade prices Trade exclusive

Create a trade account to unlock exclusive pricing, special offers and more.

Sign up for a trade account Quick & easy setup
SUBTOTAL (EX VAT) £103.08
Trade pricing is personalised to your account

Manufacturer Lead Time

£103.08

Why Choose the Mersen M803DM UL508 Non-Fused Door Mounted Disconnect Switch?

The Mersen M803DM is a compact UL508 non-fused disconnect switch engineered to provide safe electrical isolation and dependable load switching in industrial control panels and OEM machinery. Featuring an 80 A current rating, three-pole configuration and a door-mounted (DM) design, it enables convenient front-of-panel operation whilst keeping the switch body safely enclosed within the electrical cabinet.

As part of Mersen's proven M-Series disconnect switch range, the M803DM combines a compact footprint with industrial-grade durability. Designed for applications up to 600 V AC, it is suitable as a motor disconnect and offers reliable performance in demanding industrial environments.

Its door-mounted configuration eliminates the need for a separate operating shaft, simplifying installation while providing safe external operation. The M803DM is ideal for panel builders, machinery manufacturers and maintenance engineers requiring reliable circuit isolation.

Key Advantages

  • Compact 80 A UL508 non-fused disconnect switch.
  • Door-mounted (DM) configuration for convenient front operation.
  • Three-pole design for three-phase electrical systems.
  • Suitable for use as a motor disconnect switch.
  • Reliable switching up to 600 V AC.
  • Industrial-grade construction for long service life.

Key Features

  • Mersen M-Series disconnect switch.
  • 80 A rated operational current.
  • 600 V AC rated voltage.
  • Three-pole configuration.
  • Door-mounted (DM) version.
  • UL508 listed and IEC 60947-3 compliant.
  • Suitable for motor disconnect and electrical isolation.
  • Compact design with double-break silver-plated contacts.

Safe Door Mounted Isolation for Industrial Equipment

The Mersen M803DM provides reliable manual isolation of electrical circuits while allowing safe external operation through the enclosure door. Its compact design helps maximise panel space without compromising switching performance.

Designed for OEM machinery, industrial automation systems and electrical distribution equipment, the M803DM offers dependable long-term operation with straightforward installation and maintenance.

Typical Applications

  • Industrial control panels.
  • OEM machinery.
  • Motor control centres.
  • Electrical switchboards.
  • Manufacturing equipment.
  • Commercial and industrial power distribution.

Technical Specifications

Current 80 A
Phase Three Phase
Manufacturer Mersen
Series M-Series Disconnect Switches
Model M803DM
Product type UL508 Non-Fused Disconnect Switch
Rated operational current 80 A
Rated voltage 600 V AC
Number of poles 3
Configuration Door mounted (DM)
Standards UL508, IEC 60947-3
Application Motor disconnect and electrical isolation
Poles 3-pole
Device Type Fuse link
Voltage 600 V

Frequently Asked Questions

What is the Mersen M803DM used for?

The M803DM is a door-mounted non-fused disconnect switch used to safely isolate electrical circuits and disconnect motors or industrial equipment for servicing.

What is the current rating of the M803DM?

The M803DM has a rated operational current of 80 A.

What does the DM designation mean?

The DM version is supplied as a door-mounted disconnect switch, allowing the operating handle to be mounted directly on the enclosure door.

What voltage is the switch rated for?

The switch is suitable for applications up to 600 V AC.

Is the M803DM suitable as a motor disconnect?

Yes. The M803DM is designed for use as a motor disconnect switch in accordance with its UL508 approval.

Trusted by Electrical Professionals Worldwide

Mersen M-Series disconnect switches are trusted by panel builders, OEM manufacturers and industrial electricians for dependable electrical isolation, compact installation and reliable long-term switching performance.

● Service Agreements

Credit Accounts

Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.

 Priority sourcing and supply support

 Flexible payment terms for qualifying organisations

 Support for engineering, maintenance, and operations

500 +

Stock lines ready to ship

1,000 +

Same day dispatches

3500 +

Customers supported

28 

Trusted Manfacturers

● frequently asked questions

Common questions about our products and support

 

At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.

What product ranges do you supply

We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products. 

Can you help specify the correct part?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

Do you have stock for urgent orders?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What are your delivery times and costs?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What about warranties, returns and faulty items?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

● latest blog

Discover  our latest insights and
expert advice

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

by | Aug 11, 2026 |

LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.

LED Controls: Danfoss Drives Authorised Partner

LED Controls: Danfoss Drives Authorised Partner

by | Jan 17, 2026 |

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...

LED Controls: Your Complete Control Panel Solution

LED Controls: Your Complete Control Panel Solution

by | Jan 17, 2026 |

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...