MERSEN FUSE SI PTF 20 SIPTF20

MERSEN FUSE SI PTF 20 SIPTF20

Mersen Q204944 MISIPTF20 SI PTF 20 open-type miniature fuse holder for replaceable cartridge fuses used in electrical, electronic and industrial equipment.

SKU: Q204944Alt SKU: SIPTF20MPN: Q204944
Price
List Price £0.75 ex VAT
Your Price (ex VAT)
£0.75
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.

SUBTOTAL (EX VAT) £0.75
Trade pricing is personalised to your account

Manufacturer Lead Time

Sold in packs of 10

£0.75

Why Choose the Mersen Q204944 SI PTF 20 Miniature Fuse Holder?

The Mersen Q204944, catalogue reference MISIPTF20, is a compact open-type miniature fuse holder designed to provide a secure mounting point for a replaceable cartridge fuse within electrical and electronic equipment. Also described as the SI PTF 20, it offers a practical circuit-protection solution for control assemblies, power supplies, instrumentation and OEM products.

The Q204944 enables a compatible fuse link to be incorporated directly into an equipment assembly, helping protect connected circuits against overloads and short circuits. Its open construction provides straightforward access to the installed fuse, supporting convenient inspection, testing and replacement during servicing.

Manufactured by Mersen for professional electrical applications, this miniature fuse holder is suitable for use inside protected equipment and enclosures. Its compact format makes it particularly useful where installation space is limited but accessible, replaceable fuse protection is required.

Key Advantages

  • Compact miniature fuse holder for equipment-level circuit protection.
  • Open construction provides convenient access to the installed fuse.
  • Supports straightforward fuse inspection and replacement.
  • Suitable for electrical, electronic and industrial control assemblies.
  • Space-efficient design for integration into compact equipment.
  • Manufactured by Mersen for dependable professional performance.

Key Features

  • Mersen miniature fuse holder range.
  • Catalogue reference: MISIPTF20.
  • Product designation: SI PTF 20.
  • Open-type fuse holder construction.
  • Designed for replaceable miniature cartridge fuse links.
  • Suitable for installation within protected electrical equipment.
  • Provides secure fuse retention and electrical contact.
  • Bulk-packaged component for OEM and maintenance requirements.

Accessible Fuse Protection for Electrical Equipment

The Mersen Q204944 provides a secure interface between a protected electrical circuit and a replaceable miniature fuse link. When the installed fuse operates because of an overload or short circuit, the open holder design allows maintenance personnel to inspect and replace it without changing the permanent equipment wiring.

Because the holder is open and does not prevent access to the fuse or electrical contacts, it should be fitted within appropriately enclosed equipment. This makes it suitable for manufacturers and panel builders requiring compact fuse protection inside assemblies that already provide the necessary protection against accidental contact.

Typical Applications

  • Industrial control equipment.
  • Electronic power supplies.
  • Instrumentation and measuring devices.
  • Automation control assemblies.
  • Electrical and electronic equipment.
  • OEM machinery and manufactured products.

Technical Specifications

Manufacturer Mersen
Model Q204944
Catalogue reference MISIPTF20
Product designation SI PTF 20
Product type Miniature fuse holder
Holder style Open type
Fuse format Replaceable miniature cartridge fuse
Number of poles 1
Installation environment Inside protected equipment or an enclosure
Application Equipment-level overcurrent protection
Packaging Bulk
Manufacturer standard pack quantity 10
Poles 1-pole
Device Type Fuse base / holder
Fuse Type Miniature

Frequently Asked Questions

What is the Mersen Q204944 used for?

The Mersen Q204944 holds a replaceable miniature cartridge fuse used to protect electrical and electronic equipment against overloads and short circuits.

What is the catalogue reference for the Q204944?

The Mersen catalogue reference is MISIPTF20, and the product is also designated SI PTF 20.

Is a fuse supplied with the Q204944?

The Q204944 is a fuse holder. A correctly rated compatible fuse link must be selected separately unless the supplier specifically states that one is included.

Is the Q204944 an enclosed fuse holder?

No. It is an open-type miniature fuse holder intended for installation inside suitably protected electrical or electronic equipment.

Who commonly uses the Mersen Q204944?

It is suitable for electronics designers, control engineers, maintenance technicians and OEM manufacturers requiring accessible, replaceable fuse protection.

Trusted by Equipment Manufacturers Worldwide

Mersen fuse holders are trusted by electronics designers, control engineers and OEM manufacturers for secure fuse installation, convenient maintenance and dependable equipment-level circuit protection.

● 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…

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

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

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...