Call Us Today
01706 242050
Trade Portal
MERSEN FUSE H 1209UP BCKUP T292-88/125 B1000133

MERSEN FUSE H 1209UP BCKUP T292-88/125 B1000133

Mersen B1000133 Limitor-PT high voltage DIN back-up fuse with controlled power dissipation, rated at 12 kV AC and 125 A for transformer protection.

SKU: B1000133Alt SKU: 45DB120V125PTMPN: B1000133
Price
List Price £185.56 ex VAT
Your Price (ex VAT) Save 34%
£123.37 34% OFF
You save £62.19 per unit
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) £123.37
Trade pricing is personalised to your account

Manufacturer Lead Time

£123.37

Why Choose the Mersen B1000133 High Voltage DIN Back-up Fuse?

The Mersen B1000133 is a high performance Limitor®-PT high voltage DIN back-up fuse-link with controlled power dissipation (CPD), designed to provide dependable transformer protection in medium voltage electrical distribution systems. Manufactured in accordance with IEC 60282-1, it delivers reliable interruption of high fault currents while maintaining excellent thermal performance during normal operation.

Constructed using pure silver fuse elements, silver-plated copper end caps and a durable ceramic body, the B1000133 is engineered for long service life in demanding industrial and utility applications. Its integrated 80 N striker and controlled power dissipation technology help improve transformer protection and system reliability.

With a 12 kV AC voltage rating, 125 A current rating and 88 mm diameter × 292 mm length construction, the Mersen B1000133 is ideally suited for protecting transformers, switchgear and other medium voltage equipment requiring dependable short-circuit protection.

Key Advantages

  • Designed for medium voltage transformer protection.
  • Controlled Power Dissipation (CPD) technology.
  • 12 kV AC rated voltage.
  • 125 A rated current.
  • Manufactured in accordance with IEC 60282-1.
  • Integrated 80 N striker for compatible switchgear.
  • Pure silver fuse elements for consistent electrical performance.
  • Robust ceramic construction for demanding industrial environments.

Key Features

  • Manufacturer: Mersen.
  • Series: Limitor®-PT.
  • Part number: B1000133.
  • Catalogue number: 45DB120V125PT.
  • Rated voltage: 12 kV AC.
  • Rated current: 125 A.
  • Fuse dimensions: 88 mm diameter × 292 mm length.
  • Controlled Power Dissipation design.
  • Standard 80 N striker.
  • High strength ceramic body with silver-plated copper contacts.

Reliable Protection for Medium Voltage Systems

Mersen Limitor®-PT fuse-links are engineered to provide dependable transformer protection while offering controlled heat dissipation during continuous operation. This helps improve equipment longevity and enhances the reliability of medium voltage electrical distribution networks.

Designed for installation in modern switchgear and transformer assemblies, the B1000133 combines premium materials with proven Mersen engineering to deliver consistent protection in industrial, utility and OEM applications.

Typical Applications

  • Medium voltage transformers.
  • Electrical substations.
  • High voltage switchgear.
  • Industrial power distribution.
  • Utility infrastructure.
  • OEM electrical equipment.

Technical Specifications

Manufacturer Mersen
Series Limitor®-PT
Model B1000133
Catalogue number 45DB120V125PT
Product type High voltage DIN back-up fuse
Application Transformer protection
Rated voltage 12 kV AC
Rated current 125 A
Standard IEC 60282-1
Fuse size 88 mm × 292 mm
Body material Ceramic
Fuse element Pure silver
Terminal material Silver-plated copper
Striker Standard 80 N
Technology Controlled Power Dissipation (CPD)
HS Code 85351000
Device Type Fuse link
Fuse Type High voltage
Current 125 A
Voltage 12000 V

Frequently Asked Questions

What is the Mersen B1000133 used for?

The B1000133 is a high voltage DIN back-up fuse designed to protect transformers and medium voltage equipment against short-circuit faults.

What is Controlled Power Dissipation?

Controlled Power Dissipation technology helps optimise thermal performance during normal operation while maintaining dependable fault protection.

What are the electrical ratings?

This fuse is rated for 12 kV AC operation with a 125 A current rating.

Does the fuse include a striker?

Yes. The B1000133 incorporates a standard 80 N striker for operation with compatible switchgear.

Which standard does this fuse comply with?

The fuse is manufactured in accordance with IEC 60282-1 for high voltage back-up fuse-links.

Trusted for High Voltage Protection

Mersen Limitor®-PT high voltage fuse-links are trusted worldwide by utilities, switchgear manufacturers and industrial engineers for dependable transformer protection and reliable medium voltage network 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...