Standard delivery
£8 ex VAT · free over £200UK 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.
MERSEN FUSE US221 without prebreaking US221SP
Mersen J1028959 UltraSafe US221 single-pole modular fuse holder for 22 × 58 mm cylindrical fuse-links, with a 125 A conventional thermal current rating, high AC and DC voltage capability, DIN rail mounting and IP20 protection.
£15.58
Why Choose the Mersen J1028959 UltraSafe™ US221 Fuse Holder?
The Mersen J1028959, also identified as the US221, is a compact and dependable single-pole cylindrical fuse holder designed for industrial power distribution, machinery and electrical control applications. Part of the established Mersen UltraSafe™ US22 range, it accepts standard 22 × 58 mm cylindrical fuse-links and provides secure, finger-safe circuit protection.
This version is supplied without pre-breaking or auxiliary fuse-status indication, making it a straightforward solution for installations where remote monitoring is not required. Its pressure-plate terminals provide secure conductor connections, while the modular DIN rail format enables quick integration into control panels, switchboards and machine enclosures.
Designed for demanding AC and DC systems, the US221 fuse holder has a conventional thermal current rating of 125 A. The UltraSafe design supports ratings up to 800 V AC and 1000 V DC under UL specifications, while IEC applications are rated up to 690 V AC or DC.
Key Advantages
- Designed for standard 22 × 58 mm cylindrical fuse-links.
- Single-pole configuration for individual circuit protection.
- 125 A conventional thermal current rating.
- Suitable for high-voltage AC and DC electrical systems.
- Finger-safe IP20 construction, including during fuse replacement.
- Pressure-plate terminals provide secure conductor connections.
- Compact DIN rail mounting helps conserve panel space.
Key Features
- Mersen UltraSafe™ US22 series.
- Catalogue designation: US221.
- Manufacturer part number: J1028959.
- Single-pole modular fuse-holder design.
- Compatible with 22 × 58 mm cylindrical fuse-links.
- 125 A conventional free-air thermal current.
- Rated up to 800 V AC and 1000 V DC under UL specifications.
- Rated up to 690 V AC or DC under IEC specifications.
- Non-indicating version without pre-breaking.
- Pressure-plate terminal connection.
- DIN rail mounting for modular electrical panels.
- IP20 finger-safe housing.
- Optional accessories available for multi-pole assembly and remote indication.
Reliable Protection for Industrial AC and DC Circuits
The Mersen J1028959 provides a secure mounting and connection point for 22 × 58 mm cylindrical fuse-links. When fitted with an appropriately selected fuse, it helps protect industrial equipment against damaging overload and short-circuit currents.
Its high AC and DC voltage capability makes it suitable for power distribution, motor control, conversion equipment and renewable energy systems. The enclosed IP20 design also helps reduce accidental contact with live components during operation and routine fuse replacement.
Typical Applications
- Industrial control panels and switchboards.
- Variable speed drives and motor-control systems.
- Industrial machinery and OEM equipment.
- Power conversion and inverter systems.
- Battery and DC distribution circuits.
- Renewable energy installations.
- Commercial and industrial power distribution.
- Electrical automation equipment.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | None | |
|---|---|---|
| Poles | 1-pole | |
| Device Type | Fuse base / holder | |
| Fuse Type | Cylindrical | |
| Fuse Size | 22x58 mm | |
| Voltage | 800 V | |
| Manufacturer | Mersen | |
| Series | UltraSafe™ US22 | |
| Catalogue number | US221 | |
| Manufacturer part number | J1028959 | |
| Product type | Modular cylindrical fuse holder | |
| Fuse size | 22 × 58 mm | |
| Number of poles | 1 | |
| Conventional thermal current | 125 A | |
| Rated voltage AC, UL | Up to 800 V | |
| Rated voltage DC, UL | Up to 1000 V | |
| Rated voltage AC, IEC | Up to 690 V | |
| Rated voltage DC, IEC | Up to 690 V | |
| Frequency | 50 / 60 Hz | |
| Indication | Without pre-breaking or electrical indication | |
| Connection type | Pressure plate | |
| Fuse installation | Clip-in | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| Electrical supply type | AC / DC | |
| EAN | 3605340533071 |
Frequently Asked Questions
What fuse size does the Mersen J1028959 accept?
The J1028959 is designed for standard 22 × 58 mm cylindrical fuse-links.
How many poles does the Mersen US221 have?
The US221 has a single-pole configuration for protecting one electrical conductor.
Does the J1028959 include a blown-fuse indicator?
No. This version is supplied without pre-breaking or an integrated electrical blown-fuse indication system.
What are the current and voltage ratings?
The holder has a conventional thermal current rating of 125 A. It supports ratings up to 800 V AC and 1000 V DC under UL specifications and up to 690 V AC or DC under IEC specifications.
How is the Mersen J1028959 installed?
The fuse holder mounts onto a standard DIN rail inside an electrical control panel, switchboard or industrial equipment enclosure.
Trusted by Industrial Electrical Professionals
Mersen UltraSafe™ fuse holders are widely specified by panel builders, machine manufacturers and electrical engineers for reliable circuit protection, finger-safe operation and dependable performance in industrial AC and DC systems.
