Call Us Today
01706 242050
Trade Portal
MERSEN FUSE MV2 400A/185mm 3P3 1.250.064 1.250.064

MERSEN FUSE MV2 400A/185mm 3P3 1.250.064 1.250.064

The MULTIVERT® Size 2 400A NH fuse-switch disconnector delivers robust and reliable protection in demanding industrial environments, supporting 1×3-pole switching for safe isolation and circuit protection. Designed for seamless integration into 185mm bus bar systems, this unit utilises high-strength M12 screw terminals ensuring secure, low-resistance connections.

SKU: M1023212Alt SKU: 1.250.064MPN: M1023212
Price
List Price £497.75 ex VAT
Your Price (ex VAT)
£497.75
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) £497.75
Trade pricing is personalised to your account

Manufacturer Lead Time

£497.75

Why Choose the Mersen M1023212 MULTIVERT Fuse-Switch Disconnector?

The Mersen M1023212 is a high-performance NH vertical fuse-switch disconnector engineered for safe switching, isolation and fuse protection within industrial low-voltage power distribution systems. As part of the Mersen MULTIVERT® 400A series, it provides dependable protection for demanding electrical installations while supporting efficient maintenance and reliable system operation.

This model features an integrated calibrated current transformer (CT) rated at 400/5 A, Class 0.5, factory fitted in pole 1 for single-phase current measurement. Designed for direct installation onto 185 mm busbar systems, it combines compact construction with robust switching performance for modern switchboards and distribution panels.

Rated at 400 A and suitable for systems up to 690 V AC, the M1023212 accepts NH size 2 fuse-links manufactured to IEC and EN standards. The unit is supplied with three M12 bolt cable terminals, providing secure conductor connections for industrial and commercial power distribution applications.

Key Advantages

  • Combines switching, isolation and fuse protection in a single compact unit.
  • 400 A rated current for demanding industrial distribution systems.
  • Integrated 400/5 A Class 0.5 current transformer for accurate single-pole measurement.
  • Suitable for systems operating up to 690 V AC.
  • Direct installation onto 185 mm busbar systems.
  • Three-pole simultaneous switching for safe isolation.
  • Compatible with standard NH size 2 fuse-links.
  • Robust MULTIVERT modular construction simplifies installation and servicing.

Key Features

  • Mersen MULTIVERT® 400A series.
  • NH size 2 vertical fuse-switch disconnector.
  • 400 A rated current.
  • 690 V AC rated operational voltage.
  • Three-pole switching configuration.
  • Integrated 400/5 A, 3.75 VA, Class 0.5 calibrated current transformer.
  • Current transformer factory fitted in pole 1.
  • Direct mounting on 185 mm busbar systems.
  • Three M12 bolt cable terminals.
  • Designed for NH size 2 fuse-links.

Reliable Protection with Integrated Current Measurement

The Mersen M1023212 combines the protective performance of an NH fuse-switch disconnector with an integrated calibrated current transformer, allowing accurate current monitoring without requiring additional external measuring equipment. This makes it particularly suitable for installations where both protection and energy measurement are required.

Its MULTIVERT design enables quick installation onto standard 185 mm busbar systems while maintaining high levels of operator safety during installation and maintenance. The modular construction also simplifies future expansion and servicing of industrial switchboards.

Typical Applications

  • Industrial switchboards.
  • Power distribution cabinets.
  • Transformer substations.
  • Motor control centres.
  • Electrical infrastructure projects.
  • Commercial and industrial distribution systems.
  • OEM switchboard manufacturing.
  • Energy monitoring and power distribution installations.

Technical Specifications

Current 400 A
Phase Three Phase
Item number M1023212
Catalogue No 1.250.064
Description NH fuse-switch disconnector MULTIVERT® Size 2 400A 1x3-Pole switching Bus bar system 185mm Screw M12 ct1P c.
EAN/UPC Code 9008567008287
Frequency (Hz) 50 ... 60 Hz
Rated voltage AC IEC 690 V
Ampere Rating 400 A
Utilization Category AC 23 B @ Ue = AC 400 V; Ie = 400 A AC 22 B @ Ue = AC 500 V; Ie = 400 A AC 21 B @ Ue = AC 690 V; Ie = 400 A
Switchability 1x3-pole switching
RoHS Compliant Yes
AC or DC AC
Short Circuit Current Rating (SCCR) 120kA@Ue = AC 400 V; Ie = 400 A / 120kA@Ue = AC 500 V; Ie = 400 A / 120kA@Ue = AC 690 V; Ie = 315 A / 100kA@Ue = AC 690 V; Ie = 400 A
Fuse Size 2
Design Details MULTIVERT® 1.250.000 with integrated C.T. 400/5A, 3,75 VA, class 0,5; calibrated, for single pole measurement (ready fitted in pole 1)
Number of Poles 3-Pole
Degree of Pollution 3
Rated Impulse Withstand Voltage 12 kV
Rated Insulation Voltage 1000 V
Rated SC Withstand 8 kA / 1 s
Max Power dissipation of Fuse Links Pn 34 W
Max Power dissipation of Solid Links Pn 9 W
Power Dissipation by Ith without Fuse-Links 61 W
Power Dissipation by Ith without Solid Links 151 W
Rated short circuit making capacity with solid links Icm 16 kA
Installation Mounting Bus bar system 185 mm
Product Width 98 mm
Product Length 190 mm
Product Height 685 mm
Sell Pack Quantity 1 EA
Sell Pack Weight 4.9 kg
Sell Pack Width 100 mm
Sell Pack Length 688 mm
Sell Pack Height 195 mm
Product group IEC Fuse Switch Disconnectors
Conventional Free Air thermal Current With Fuse-Links Ith 400 A
Product Weight 4.9 kg
Conventional Free Air thermal Current - Solid Links 630 A
Poles 3-pole
Device Type Fuse switch disconnector
Voltage 690 V

Frequently Asked Questions

What is the Mersen M1023212 used for?

The M1023212 provides switching, isolation and fused protection for three-phase low-voltage electrical distribution systems while also offering integrated current measurement.

What current transformer is fitted?

The unit includes a factory-fitted 400/5 A, 3.75 VA, Class 0.5 calibrated current transformer installed in pole 1 for single-pole measurement.

Which fuse-links are compatible?

The fuse-switch disconnector accepts standard NH size 2 fuse-links manufactured in accordance with IEC/EN 60269-2.

What is the rated current?

The M1023212 has a continuous rated current of 400 A.

What busbar spacing is required?

This MULTIVERT model is designed for direct installation onto standard 185 mm busbar systems.

Trusted for Industrial Power Distribution

Mersen MULTIVERT fuse-switch disconnectors are trusted worldwide by panel builders, electrical contractors and industrial engineers for delivering safe circuit isolation, dependable fuse protection and reliable long-term operation in demanding power distribution systems.

● 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...