MERSEN FUSE US222I US222I

Q: What fuse size does the US222I accept?

It accepts standard 22 × 58 mm cylindrical fuse links with ratings up to 125 A.

Q: What voltage ratings does the fuse holder support?

The US222I is rated up to 690 V AC under IEC standards and 800 V AC or 1000 V DC under UL standards.

Mersen L331164 US222I UltraSafe two-pole modular fuse holder for 22 x 58 mm cylindrical fuse links with visual blown-fuse indicator, rated 125 A and IP20 finger-safe protection.

SKU: L331164Alt SKU: US222IMPN: L331164

List Price £75.32 ex VAT

Your Price (ex VAT)

£75.32

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.

Quantity:

SUBTOTAL (EX VAT) £75.32

Trade pricing is personalised to your account

Manufacturer Lead Time

£75.32

Why Choose the Mersen L331164 US222I UltraSafe Fuse Holder?

The Mersen L331164, catalogue reference US222I, is a high-performance two-pole modular fuse holder designed for 22 × 58 mm cylindrical fuse links. Part of the proven Mersen UltraSafe™ US22 series, it delivers dependable overcurrent protection for industrial control panels, switchboards, machinery and power distribution systems whilst incorporating an integrated visual blown-fuse indicator.

The US222I features IP20 finger-safe protection, including during fuse replacement, helping improve operator safety and minimise accidental contact with live components. Its compact DIN rail mounted design, pressure-plate terminals and lockable modular construction make it ideal for OEM machinery, panel builders and industrial electrical installations.

Suitable for fuse links rated up to 125 A, the L331164 carries IEC ratings up to 690 V AC together with UL ratings of 800 V AC and 1000 V DC. The integrated visual fuse indicator allows maintenance engineers to quickly identify an operated fuse, reducing troubleshooting time and equipment downtime.

Key Advantages

Two-pole UltraSafe™ modular fuse holder.
Designed for 22 × 58 mm cylindrical fuse links.
125 A rated current.
Integrated visual blown-fuse indicator.
IP20 finger-safe protection, including during fuse replacement.
DIN rail mounting for fast installation.
Pressure-plate terminals provide secure conductor connections.
Suitable for demanding industrial AC and DC applications.

Key Features

Mersen UltraSafe™ US22 series.
Catalogue number: US222I.
Manufacturer item number: L331164.
Two-pole configuration.
Accepts 22 × 58 mm cylindrical fuse links.
125 A rated current.
690 V AC IEC rating.
800 V AC / 1000 V DC UL ratings.
Integrated visual blown-fuse indicator.
Pressure-plate terminals.
DIN rail mounting.
IP20 finger-safe enclosure.

Reliable Circuit Protection with Visual Fuse Indication

The Mersen L331164 provides dependable protection for industrial circuits using 22 × 58 mm cylindrical fuse links. Its two-pole configuration is ideal for protecting two conductors or phases within one compact modular assembly, helping optimise control panel layouts whilst maintaining excellent accessibility for maintenance personnel.

The integrated visual blown-fuse indicator enables rapid identification of an operated fuse without removing the fuse holder or carrying out extensive testing. Combined with its finger-safe design and robust construction, the US222I is an excellent choice for industrial automation, OEM machinery and electrical distribution systems.

Typical Applications

Industrial control panels.
Motor protection circuits.
Transformer protection.
Machine building.
OEM automation systems.
Electrical switchboards.
Low voltage power distribution.

Technical Specifications

Manufacturer	Mersen
Series	UltraSafe™ US22
Model	US222I
Item number	L331164
Product type	Modular cylindrical fuse holder
Number of poles	2
Fuse size	22 × 58 mm
Rated current	125 A
Rated voltage (IEC)	690 V AC
Rated voltage (UL)	800 V AC / 1000 V DC
Frequency	50 / 60 Hz
Short-circuit current rating	100 kA
Protection rating	IP20
Mounting type	DIN rail
Terminal type	Pressure plate
Indication	Visual blown-fuse indicator
Body material	Flame-retardant thermoplastic
Dimensions (H × W × D)	approx. 126.5 × 70 × 96.5 mm
Weight	approx. 0.325 kg
Compliance	IEC, UL, CSA, RoHS and UKCA
HS Code	85361090
Country of Manufacture	Tunisia
Poles	2-pole
Device Type	Fuse base / holder
Fuse Type	Cylindrical
Fuse Size	22x58 mm
Current	125 A
Voltage	690 V

Frequently Asked Questions

What is the Mersen L331164 used for?

The L331164 is a two-pole modular fuse holder designed for 22 × 58 mm cylindrical fuse links used in industrial electrical protection applications.

What fuse size does the US222I accept?

It accepts standard 22 × 58 mm cylindrical fuse links with ratings up to 125 A.

Does the L331164 include a blown-fuse indicator?

Yes. The US222I incorporates an integrated visual blown-fuse indicator for rapid local identification of an operated fuse.

What voltage ratings does the fuse holder support?

The US222I is rated up to 690 V AC under IEC standards and 800 V AC or 1000 V DC under UL standards.

How is the Mersen L331164 installed?

The fuse holder mounts onto a standard DIN rail and uses pressure-plate terminals to provide secure electrical conductor connections.

Trusted by Industrial Panel Builders Worldwide

Mersen UltraSafe™ fuse holders are trusted by electrical engineers, OEM manufacturers and panel builders for dependable overcurrent protection, finger-safe operation and fast maintenance in industrial electrical systems.

Manufacturer	Mersen
Series	UltraSafe™ US22
Model	US222I
Item number	L331164
Product type	Modular cylindrical fuse holder
Number of poles	2
Fuse size	22 × 58 mm
Rated current	125 A
Rated voltage (IEC)	690 V AC
Rated voltage (UL)	800 V AC / 1000 V DC
Frequency	50 / 60 Hz
Short-circuit current rating	100 kA
Protection rating	IP20
Mounting type	DIN rail
Terminal type	Pressure plate
Indication	Visual blown-fuse indicator
Body material	Flame-retardant thermoplastic
Dimensions (H × W × D)	approx. 126.5 × 70 × 96.5 mm
Weight	approx. 0.325 kg
Compliance	IEC, UL, CSA, RoHS and UKCA
HS Code	85361090
Country of Manufacture	Tunisia
Poles	2-pole
Device Type	Fuse base / holder
Fuse Type	Cylindrical
Fuse Size	22x58 mm
Current	125 A
Voltage	690 V

UK delivery

Delivery options

Free UK delivery on orders over £200 ex VAT. Order in-stock items before 2pm Monday to Friday for next-day delivery.

This product Lead time on request

Please contact us for a delivery time before you order

Standard delivery

£8 ex VAT · free over £200

UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.

Heavier items may be charged at a weight-based or pallet rate, shown at checkout.

Collect from our showroom

Mon–Fri, 8am–5pm

Order and pay online, then collect from our showroom.

Please allow 15–30 minutes after ordering for us to prepare your order.

Northern Ireland, ROI & export

Priced at checkout

We deliver to Northern Ireland, the Republic of Ireland and overseas.

Delivery is calculated at checkout based on your destination.

Orders with mixed availability

Shipped complete

If part of your order is on a lead time, we hold it and send everything together.

Need the in-stock items sooner? Ask us and we can split the delivery.

Business customer returns

Returns & order support

Need to return an item? Find the guidance for your order below, then contact our team before sending anything back.

Stocked items

Request within 30 days

Changed your mind or ordered the wrong item? Request a return within 30 days of receipt. There is no restocking charge.

Items must be unused, in resalable condition and in their original packaging, and returns need our approval first. Return carriage is at your cost, and the original delivery charge is not refunded.

Faulty or damaged items

Tell us as soon as possible

Faulty, damaged on delivery or the wrong product supplied? Contact our team as soon as possible with the details.

We will review the issue and arrange an appropriate resolution under our terms and conditions and your statutory rights.

Made-to-order items

Manufacturer approval needed

Manufactured, configured and special-order products can only be returned with the manufacturer’s approval. Any handling charge is agreed with you when you request the return.

This does not affect claims for faulty goods or items that do not meet the agreed specification.

LED Controls showroom with electrical products on display

Let’s get your return sorted.

Send your order number, product details and reason for return. For faults or delivery damage, include photographs if available. We will confirm the next steps.

Email returns team 01706 242050

The 30-day return request period applies to change-of-mind returns for stocked items. It does not limit your statutory rights for faulty or non-conforming goods.

● 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?

What are your delivery times and costs?

What about warranties, returns and faulty items?

● 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…

by admin | Aug 11, 2026 | News

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

by admin | Jan 17, 2026 | Product Spotlight

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