Bussmann 12THMEJ100 Medium Vol...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3,503.81
Bussmann 12THMEJ100 Fuse-link, medium voltage, 100 A, AC 12 kV, 2.5", 64 x 442 mm, back-up, DIN, with striker

Bussmann 12THMEJ100 Medium Voltage Fuse-Link, 100A 12kV Back-Up, DIN, with Striker

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Model: 12THMEJ100
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Bussmann 12THMEJ100 Medium Voltage Fuse-Link, 100A 12kV Back-Up, DIN, with Striker

The Bussmann 12THMEJ100 is a medium voltage fuse-link engineered for dependable overcurrent protection in transformer applications. Rated 100 A at AC 12 kV, this back-up class fuse-link measures 2.5" (64 x 442 mm) and is manufactured to the DIN 43625 dimensional standard for straightforward replacement in DIN-style mounting systems. Equipped with a built-in striker for mechanical trip indication, it is rated for indoor or outdoor use and compliant with IEC 60282-1.

Key Features

  • Trade Size: 2.5" (64 x 442 mm) sized for DIN 43625 mounting hardware.
  • Amperage Rating: 100 A continuous rating for medium voltage protection.
  • Voltage Rating: AC 12 kV rating for medium voltage circuits.
  • Interrupt Rating: 63 kAIC interrupting rating for high fault-current conditions.
  • Class Back-Up: Back-up class fuse-link for coordination with primary protection.
  • With Striker: Integrated striker pin indicates a blown fuse and can trip auxiliary devices.
  • Installation Technique: Air installation technique for open-air switchgear and transformer compartments.
  • Rated Frequency: 50 Hz frequency rating for standard AC power systems.

Certifications & Compliance

  • IEC 60282-1 Compliant
  • DIN 43625 Compliant
  • DIN Standard

Technical Specifications

  • Application: transformer protection | indoor or outdoor use
  • Certifications: IEC60282-1
  • Class: Class back-up
  • Compliances: DIN 43625
  • Installation Technique: Air
  • Interrupt Rating: 63 kAIC
  • Product Height: 67 mm
  • Product Length Depth: 510 mm
  • Product Weight: 3519 g
  • Product Width: 67 mm
  • Rated Frequency Max: 50 Hz
  • Rated Frequency Min: 50 Hz
  • Release Characteristic: Other
  • Standard: DIN
  • Utilization Category: Other
  • Voltage Type: AC
  • With Striker: Yes

Typical Applications

  • Transformer Protection
  • Medium Voltage Switchgear
  • Indoor Electrical Distribution Systems
  • Outdoor Substation and Utility Installations
  • Back-Up Coordination with Primary Fuse Protection

Why Bussmann?

Bussmann is a recognized name in circuit protection, and the 12THMEJ100 reflects that reputation with DIN 43625 dimensional compliance and IEC 60282-1 performance standards. Its back-up class design and integrated striker deliver dependable, code-compliant protection for medium voltage transformer circuits in indoor or outdoor installations. Choose Bussmann for medium voltage fuse-links built for critical electrical infrastructure.

Manufacturer Resources

Product Specs

Amperage Rating:
100 A
Application:
transformer protection | indoor or outdoor use
Certifications:
IEC60282-1
Class:
Class back-up
Compliances:
DIN 43625
Fuse Indicator:
With Striker
Installation Technique:
Air
Interrupt Rating:
63 kAIC
Performance Cat According To Iec 60282 1:
Back-up
Product Height:
67 mm
Product Length Depth:
510 mm
Product Weight:
3519 g
Product Width:
67 mm
Rated Frequency Max:
50 Hz
Rated Frequency Min:
50 Hz
Release Characteristic:
Other
Standards:
DIN
Utilization Category:
Other
Voltage Type:
AC
With Striker:
Yes
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 12THMEJ100 – Frequently Asked Questions

1) Will a Bussmann 12THMEJ100 fuse-link fit DIN 43625 fuse holders in my ring main unit?
Yes. The 12THMEJ100 is built to the DIN 43625 dimensional standard, so it drops into DIN-style fuse carriers and switchgear holders sized to that standard. Body dimensions are 67 mm height, 67 mm width, and 510 mm overall length. Check the striker end orientation in your carrier, since this one carries a striker pin.
2) What does back-up class mean on a 12 kV fuse-link, and can I use it as the only protection on a transformer?
No, not on its own. The 12THMEJ100 is a back-up class fuse-link under IEC 60282-1, which means it only interrupts currents above a minimum breaking value. Low-level overloads have to be cleared by something else, normally the switch-fuse combination or the relay on the incomer. If you need a device that clears the full range from minimum melting current up to full fault level, you want a general purpose or full-range link instead, not a back-up one. On a standard transformer-protection installation, pairing it with a load-break switch that trips on the striker is the usual arrangement.
3) What does the striker on the Bussmann 12THMEJ100 actually do?
The striker is a spring-loaded pin that fires out of the fuse end when the element operates. Two jobs: it gives you a visible mechanical flag that the link has blown, and it mechanically trips the load-break switch it sits in, so a single blown phase opens all three poles instead of leaving the transformer single-phasing. If your switchgear has a striker trip bar, you need a striker link like this one; a plain link without the pin will not trip the switch.
4) Can this Bussmann medium voltage fuse be installed in an outdoor pad-mount or substation enclosure?
Indoor or outdoor use are both covered for the 12THMEJ100, provided it is in an enclosure. It is an air-installation link, meaning it is designed to operate in open air inside switchgear cubicles and transformer compartments, not immersed in oil or SF6. If your transformer uses oil-immersed fuse mountings, this is the wrong type of link for that position.
5) Can I use the 12THMEJ100 on a 60 Hz system?
This link is rated 50 Hz, minimum and maximum both. It is specified for 50 Hz networks, which is what the DIN 43625 format is generally deployed on. For a 60 Hz system, specify a link rated at that frequency rather than applying this one outside its stated rating.
6) Does the Bussmann 12THMEJ100 meet IEC 60282-1 for a spec that calls out that standard?
IEC 60282-1 compliant, and rated back-up under that standard's performance categories. It also meets DIN 43625 for dimensions, so it satisfies a spec written around DIN-format current-limiting fuse-links for medium voltage switchgear.
How fast can I get the Bussmann 12THMEJ100 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 Bussmann 12THMEJ100 come with a warranty?
Absolutely. The Bussmann 12THMEJ100 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 Bussmann 12THMEJ100?
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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