Mersen UltraSafe Fuse Holder, ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$103.14
Mersen UltraSafe Fuse Holder, 800VAC/1000VDC, IP20

Mersen UltraSafe Fuse Holder, 800VAC/1000VDC, IP20

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Model: E331158

In Stock (leaves warehouse same day if ordered before 3pm ET)

$103.14
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Mersen UltraSafe™ 3-Pole Fuse Holder, 800VAC/1000VDC, IP20

The Mersen UltraSafe™ Fuse Holder is a finger-safe, IEC IP20-rated modular fuse-holder built for 22x58 fuses in a 3-pole configuration. Rated 800VAC (UL) / 1000VDC (UL) and 690V AC/DC (IEC), with a maximum fuse rating of 125A, this holder combines tough thermoplastic construction with tin-plated copper clip terminals for reliable, code-compliant fuse protection in industrial control and power distribution panels.

Key Features

  • Fuse Size: Accepts standard 22x58 fuses for precise, compatible fuse installation.
  • 3-Pole Design: Triple-pole configuration simplifies multi-phase circuit protection; multi-pole units can be field-assembled with a pin-ties assembly kit.
  • Durable Construction: Body/insulating material is Polyamide thermoplastic for toughness and durability, with tin-plated copper clip terminals.
  • Clip-In Fuse Installation: Clip connection/terminal type allows fast, finger-safe fuse changes without tools.
  • Electrical Ratings: Rated 800V AC (UL) / 1000V DC (UL), 690V AC/DC (IEC), with a max fuse rating of 125A and Ith of 125A at 50...60 Hz.
  • Short Circuit Current Rating: 100 kA SCCR delivers robust protection against fault conditions.
  • Insulation & Impulse Withstand: Rated insulation voltage of 750V with an 8 kV rated impulse withstand voltage for added dielectric margin.
  • Finger-Safe IP20 Protection: IP20 grade of protection under IEC standards keeps live parts finger-safe, even during fuse changes.
  • DIN Rail Mounting: Installs on DIN rail per EN 60715 for fast, standardized panel mounting; accepts optional microswitches for remote blown-fuse indication.
  • Wiring Range: Accommodates 1/0 - #14 AWG conductors, and torque rating is 35.403 lb-in.

Certifications & Compliance

  • ROHS Compliant
  • UL and IEC rated versions available

Technical Specifications

  • Connection/Terminal Type: Clip
  • Connection/Terminal Material: Tin-Plated Copper
  • Torque Rating: 35.403 lb-in
  • Ampere Rating: 125 A
  • ROHS Compliant: Yes
  • Frequency (Hz): 50 ... 60 Hz
  • Rated voltage DC IEC: 690 V
  • Rated voltage AC UL: 800 V
  • Number of Poles: 3-Pole
  • Conventional Free Air thermal Current With Fuse-Links Ith: 125 A
  • Wiring range: 1/0 - #14
  • Rated Insulation Voltage: 750 V
  • AC or DC: AC/DC
  • Short Circuit Current Rating (SCCR): 100 kA
  • Installation Mounting: DIN rail acc. EN 60715
  • Max Fuse Rating: 125 A
  • Fuse Installation Method: Clip-in
  • Rated voltage DC UL: 1000 V
  • Rated voltage AC IEC: 690 V
  • Design Details: triple pole
  • Fuse Size: 22x58
  • Rated Impulse Withstand Voltage: 8 kV
  • Body/Insulating Material: Polyamide

Typical Applications

  • Industrial Control Panels and Switchgear
  • Motor Control Centers and Power Distribution Boards
  • DIN Rail-Mounted Circuit Protection Assemblies
  • Commercial and Industrial Electrical Installations Requiring Finger-Safe Fuse Access
  • Multi-Pole Fuse Protection for AC/DC Circuits

Why Mersen?

Mersen's UltraSafe™ fuse-holders pair tough Polyamide thermoplastic construction with tin-plated copper clip terminals to deliver dependable, code-compliant fuse protection. With an IP20 finger-safe design, 100 kA SCCR, and DIN rail mounting per EN 60715, this 3-pole holder is engineered for reliable performance in demanding industrial power and control applications.

Manufacturer Resources

Product Specs

Product Type:
Fuse Holder
Product Group:
Circuit Protection
Department:
Electrical
list_batch:
MERSEN-20260825
Product Subgroup:
Fuse Holders & Blocks
Product Height:
5.02 in
Torque Rating:
35.403 lb-in
Ampere Rating:
125 A
Max Fuse Rating:
125 A
Product Length:
3.01 in
Installation Mounting:
DIN rail acc. EN 60715
ROHS Compliant:
Yes
Fuse Installation Method:
Clip-in

Mersen E331158 – Frequently Asked Questions

1) What fuse size does the Mersen UltraSafe fuse holder take?
It accepts 22x58 fuses only, clipped in by hand with no tools. Max fuse rating is 125 A, so size your fuse-links at or below that. A 10x38 or 14x51 class fuse will not seat in these clips.
2) Can I get the Mersen UltraSafe 22x58 holder in 1-pole or 2-pole instead of 3-pole?
Yes. Three pole counts are offered: 1-pole (E331158), 2-pole (K331163) and 3-pole (R331169). Pick by circuit: single pole for DC or single-phase legs, two pole for DC positive/negative or split-phase, three pole for three-phase feeders and motor circuits.
3) What voltage can I run through this Mersen 22x58 fuse holder on a DC solar or battery circuit?
UL ratings are 1000 V DC and 800 V AC. Under IEC the holder is rated 690 V AC/DC. That 1000 VDC UL figure is what makes it usable on PV string and battery combiner work.
4) What short circuit current rating does the Mersen UltraSafe holder carry for my panel SCCR calculation?
100 kA SCCR. It also lists a rated insulation voltage of 750 V and an 8 kV rated impulse withstand, with conventional free air thermal current (Ith) of 125 A at 50 to 60 Hz.
5) Is the Mersen UltraSafe fuse holder suitable for a wet or outdoor location?
The Mersen UltraSafe holder carries an IEC IP20 grade of protection, which is a finger-safe rating against contact with live parts, not a rating against water ingress, so it belongs inside an enclosure. For a run that must be sealed against moisture, the Littelfuse WPB1 is an in-line watertight fuse holder intended for that condition. Choose the UltraSafe holder when the fuse sits on a DIN rail inside a control panel per EN 60715.
6) Can a Littelfuse WPB1 in-line fuse holder be used in place of the Mersen UltraSafe 22x58 fuse holder in a control panel?
No, they solve different problems. The Mersen UltraSafe holder is a DIN rail mounted modular holder per EN 60715 that accepts 22x58 fuses, is rated 800VAC/1000VDC UL with a 125A max fuse rating, 100 kA SCCR, and an IP20 finger-safe body. The Littelfuse WPB1 is an in-line watertight fuse holder, meaning it is spliced into a wiring run rather than mounted on rail inside an enclosure. If the fuse protection lives on a panel rail with wire terminated at the holder, the UltraSafe holder is the correct form factor; the WPB1 suits a sealed in-line application outside a panel.
7) Is this Mersen holder finger-safe for fuse changes in a live panel?
It carries an IEC IP20 grade of protection, which keeps live parts shielded from finger contact, including during a fuse change. IP20 is ingress protection against solid objects only, not water, so it is a panel-interior device.
8) Can I get blown-fuse indication back to the PLC from this holder?
Yes, the UltraSafe holder accepts optional microswitches for remote blown-fuse indication. The microswitch is a separate order item.
9) Can I gang single-pole units together to make a multi-pole assembly?
Yes. Multi-pole units can be field-assembled from singles using a pin-ties assembly kit. If you want it factory-configured instead, order the 2-pole K331163 or 3-pole R331169 directly.
10) Can I use this Mersen holder for a 125 V 15 A branch plug fuse application?
No. This is a 22x58 industrial holder rated to 800 VAC/1000 VDC and 125 A, for DIN rail panel work. For a low-voltage plug fuse at a box cover, the Littelfuse LSRY Series plug fuse box cover unit, 125 V 15 A, is the correct device.
11) We have a Littelfuse LSRY plug fuse box cover unit on an old panel - is the Mersen UltraSafe holder the modern replacement?
They are not interchangeable parts. The Littelfuse LSRY is a plug fuse box cover unit, built around screw-in plug fuses at 125V 15A. The Mersen UltraSafe holder is a 22x58 cylindrical fuse holder rated 800VAC/1000VDC UL with a 125A max fuse rating, clip-in fuse installation, and DIN rail mounting per EN 60715. Moving from the LSRY to the UltraSafe holder means changing the fuse type, the mounting method, and the voltage class of the assembly, so it is a panel redesign rather than a drop-in swap.
12) If I only need to protect a single circuit, do I have to buy the 3-pole Mersen UltraSafe holder?
No. The Mersen UltraSafe 22x58 holder is offered in 1-pole (E331158), 2-pole (K331163), and 3-pole (R331169) configurations, all sharing the 800VAC/1000VDC UL rating, 125A max fuse rating, and DIN rail mounting. A single-phase or DC circuit needing one fuse takes the 1-pole E331158; multi-pole units can also be field-assembled using a pin-ties assembly kit if the pole count changes later.
13) What is the body material on this Mersen fuse holder and will it stand up to panel heat?
The body and insulating material is polyamide thermoplastic, with tin-plated copper clips carrying the current. It is also RoHS compliant.
How fast can I get the Mersen E331158 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Mersen E331158 come with a warranty?
Absolutely. The Mersen E331158 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Mersen E331158?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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