Mersen UltraSafe™ Fuse Holder,...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$373.01
Mersen UltraSafe™ Fuse Holder, 3-Pole, 800VAC/1000VDC, 22x58 Fuse, Visual Indicator

Mersen UltraSafe™ Fuse Holder, 3-Pole, 800VAC/1000VDC, 22x58 Fuse, Visual Indicator

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Model: S331170

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

$373.01
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Mersen UltraSafe™ Fuse Holder, 3-Pole, 800VAC/1000VDC, 22x58 Fuse, Visual Indicator

The Mersen UltraSafe™ fuse holder is a modular, finger-safe fuse-holding solution built for professional panel building and industrial control applications. This 3-pole unit accepts 22x58 size fuses and is rated 800VAC (UL) / 1000VDC (UL), with a 125A ampere rating and a 100kA short circuit current rating (SCCR), delivering reliable overcurrent protection on DIN rail-mounted equipment. Constructed of tough thermoplastic/thermoset material, the holder is finger-safe to an IP20 grade of protection under IEC standards, and includes a visual blown-fuse indicator for fast troubleshooting.

Key Features

  • 3-Pole Configuration: Triple-pole design (Number of Poles: 3-Pole) for multi-conductor circuits, field-assemblable to 1, 2, 3, or 4 poles with a pin-ties assembly kit.
  • Fuse Compatibility: Sized for 22x58 fuses with a Max Fuse Rating of 125 A and clip-in fuse installation.
  • Voltage Rating: Rated voltage AC UL 800 V / DC UL 1000 V (AC IEC 690 V / DC IEC 690 V), with a Rated Insulation Voltage of 750 V and Rated Impulse Withstand Voltage of 8 kV for AC/DC applications.
  • Ampere Rating: 125 A Ampere Rating with a Conventional Free Air Thermal Current With Fuse-Links (Ith) of 125 A and a Short Circuit Current Rating (SCCR) of 100 kA.
  • Visual Blown-Fuse Indicator: Built-in visual indication system for quick identification of a blown fuse; microswitches for remote indication can also be supplied or ordered separately.
  • Terminal Connections: Clip connection/terminal type with Tin-Plated Copper terminal material, Wiring range of 1/0 - #14, and a Torque Rating of 35.403 lb-in.
  • Durable Construction: Body/Insulating Material is Polyamide, built from tough and durable thermoplastic or thermoset material for long service life.
  • Mounting: DIN rail mounting per EN 60715, with a Frequency rating of 50...60 Hz.

Certifications & Compliance

  • ROHS Compliant
  • Finger-safe to IP20 grade of protection under IEC standards
  • Rated Voltage AC UL 800 V / DC UL 1000 V; AC IEC 690 V / DC IEC 690 V

Technical Specifications

  • Indication System: Yes
  • ROHS Compliant: Yes

Typical Applications

  • Industrial Control Panels and Motor Control Centers
  • DIN Rail Panel Wiring and OEM Panel Building
  • Short-Circuit and Overcurrent Protection Circuits
  • AC/DC Power Distribution Requiring 800VAC/1000VDC Fuse Protection
  • Applications Requiring Remote Blown-Fuse Indication via Microswitch

Why Mersen?

Mersen's UltraSafe™ range combines finger-safe IP20 modular design with tough thermoplastic/thermoset construction, tin-plated copper terminals, and a 100 kA short circuit current rating for demanding electrical environments. With ROHS-compliant materials, DIN rail mounting, and integrated visual fuse indication, this 3-pole fuse holder supports safe, code-conscious fuse changing and reliable, long-term performance in professional electrical installations.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Connection Terminal Type:
Clip
Indication System Type:
Visual Indicator
Connection/Terminal Material:
Tin-Plated Copper
Torque Rating:
35.403 lb-in
Indication System:
Yes
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
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fuse Holder
Product Subgroup:
Fuse Holders & Blocks

Mersen S331170 – Frequently Asked Questions

1) What size fuse does the Mersen UltraSafe S331170 fuse holder take?
It takes 22x58 mm cylindrical fuse links, up to 125 A, installed by clipping in rather than screwing down. If your panel drawing calls for 10x38 or 14x51 links, this is the wrong body size and the fuse will not seat.
2) Can I use this Mersen fuse holder on a 1000V DC solar or battery circuit?
Yes. The UltraSafe 3-pole holder is rated 1000 V DC under UL and 800 V AC under UL, so it covers 1000 VDC work. To IEC it is 690 V on both AC and DC. Insulation voltage is 750 V and impulse withstand is 8 kV, and it is rated for AC/DC service at 50 to 60 Hz.
3) What wire sizes will the terminals accept, and what torque do I tighten them to?
The wiring range is 1/0 through #14, on tin-plated copper clip terminals. Torque spec is 35.403 lb-in. Keep a torque screwdriver on it, since loose terminals on a 125 A feeder are where the heat comes from.
4) Will a 125A Mersen UltraSafe holder work in a panel that needs 100kA SCCR?
Yes. The holder carries a 100 kA short circuit current rating and a 125 A ampere rating, with a conventional free air thermal current with fuse-links (Ith) of 125 A. That makes it usable where an industrial control panel label has to show 100 kA available fault current.
5) Can a Littelfuse WPB1 in-line fuse holder be used in place of the Mersen S331170 in a DIN rail control panel?
No. The Mersen S331170 is a 3-pole DIN rail fuse holder that mounts per EN 60715 and takes 22x58 clip-in fuses at up to 125 A, with an 800 VAC UL / 1000 VDC UL rating. The Littelfuse WPB1 Series is an in-line watertight fuse holder, meaning it is spliced into a cable run rather than mounted on rail inside an enclosure. For panel building where the fuse block must sit on rail beside other modular devices, the S331170 is the correct form factor; the WPB1 suits a protected in-line tap on a wiring harness or exposed cable.
6) How does this fuse holder mount in a control panel?
It snaps onto DIN rail per EN 60715, so no panel drilling. The body is polyamide and the unit is finger-safe to IP20, which lets an electrician change fuses with the enclosure open without exposed live metal.
7) I need 1, 2 or 4 poles instead of 3. Do I have to buy a different part?
The S331170 is a triple-pole unit, but UltraSafe modules are field-assemblable into 1, 2, 3 or 4 pole groups using a pin-ties assembly kit. For a 4-pole feeder you gang modules; the pin-ties kit is ordered separately.
8) How do I tell which fuse has blown without pulling each one?
A visual blown-fuse indicator is built into the holder, so you read it off the front of the module. If you need the fault reported back to a PLC or alarm, microswitches for remote indication can be supplied or ordered separately rather than built in as standard.
9) Is a watertight in-line fuse holder an alternative to this DIN rail unit?
Different jobs. The Mersen UltraSafe S331170 is a DIN rail panel component for 22x58 fuses at 125 A and 800 VAC / 1000 VDC. For a spliced-in automotive or wet-location run there is the Littelfuse WPB1 Series in-line watertight fuse holder, which is wired into a cable rather than mounted on rail. Do not substitute it into a 125 A industrial control panel.
10) What should be used instead of the Mersen S331170 for a residential plug fuse panel?
The Mersen S331170 is built for industrial control panels: 22x58 cylindrical fuses, 125 A, 800 VAC UL / 1000 VDC UL, DIN rail mounted. It does not accept screw-in plug fuses and is not a panel cover device. For a plug fuse box, the Littelfuse LSRY Series plug fuse box cover unit, rated 125 V 15 A, is the type of device that suits that opening.
11) For a 1000 VDC solar or battery circuit, is the Mersen S331170 or a Littelfuse in-line holder the right choice?
The Mersen S331170 carries a UL DC rating of 1000 V alongside 800 VAC UL, with a 100 kA short circuit current rating and tin-plated copper clip terminals taking 1/0 to #14 conductors, which is why it is specified on high-voltage DC distribution inside enclosures. The Littelfuse WPB1 Series is an in-line watertight holder intended for cable-mounted use rather than a rail-mounted high-DC-voltage fuse block, so for a 1000 VDC string circuit terminated in a panel the S331170 is the fit.
12) Is this fuse holder RoHS compliant for an OEM export panel?
Yes, the UltraSafe 3-pole holder is RoHS compliant, with a polyamide insulating body and tin-plated copper terminals.
13) Does any alternative give blown-fuse indication the way the Mersen S331170 does?
The S331170 includes a built-in visual blown-fuse indicator for troubleshooting without pulling the fuse. Among the comparable fuse holders, the Littelfuse WPB1 Series is an in-line watertight holder and the LSRY Series is a plug fuse box cover unit; neither is an indicating modular rail holder. If visual indication at the fuse position is the requirement, the S331170 with its visual indication system is the one that provides it.
How fast can I get the Mersen S331170 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 S331170 come with a warranty?
Absolutely. The Mersen S331170 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 S331170?
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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