Mersen TR100R Class RK5 Time-D...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$24.70
Mersen TR100R Class RK5 Time-Delay Fuse, 100A, Blade Terminal

Mersen TR100R Class RK5 Time-Delay Fuse, 100A, Blade Terminal

(No reviews yet) Write a Review

Model: TR4R

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

$24.70
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Mersen TR7R Tri-Onic Class RK5 Time-Delay Fuse, 7A 250VAC/160VDC

The Mersen TR7R is a Class RK5 time-delay fuse rated 7A for both 250VAC and 160VDC applications, part of Mersen's Tri-Onic fuse line. Built with ferrule terminals, copper connection terminals, and PolyTube insulating material, this compact 2 in fuse delivers a 200 kA breaking capacity for demanding industrial and commercial electrical systems. Its time-delay characteristic allows temporary overloads while still protecting circuits against sustained overcurrent conditions.

Key Features

  • Ampere Rating: 7A rating provides precise overcurrent protection for medium-load circuits and equipment.
  • Class RK5 Time-Delay: Allows temporary overloads while protecting against sustained overcurrent conditions.
  • Dual Voltage Rating: 250VAC/160VDC rating supports both AC and DC electrical systems.
  • 200 kA Breaking Capacity: Safely interrupts high fault currents in demanding applications.
  • Ferrule Terminal Design: Copper connection terminals ensure secure, reliable connections.
  • PolyTube Insulation: Durable body insulating material in a compact 2 in length.
  • Clip Mounting: Designed for standard clip-mount fuse holders at 50/60 Hz.
  • Compact & Lightweight: 2 in length and 0.037 lb weight for easy installation.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Ac Max I R Breaking Capacity I1: 200 kA
  • Ac Or Dc: AC/DC
  • Ampere Rating: 7A
  • Body Insulating Material: PolyTube
  • Connection Terminal Material: Copper
  • Connection Terminal Type: Ferrule
  • Frequency Hz: 50/60 Hz
  • Fuse Class: Class RK5
  • Mounting Method: Clip
  • Product Length: 2 in
  • Product Weight: 0.037 lb
  • Rated Voltage Ac Ul: 250 V
  • Rated Voltage Dc Ul: 160 V
  • Rohs Compliant: Yes
  • Speed Characteristic: Time Delay

Typical Applications

  • Industrial Control Panels
  • Motor Control Centers
  • Power Distribution Equipment
  • Electronic Equipment Protection
  • HVAC System Controls
  • Instrumentation Circuits
  • Commercial Electrical Systems

Why Mersen?

Mersen fuses deliver proven reliability through RoHS compliant construction and professional-grade materials like copper terminals and PolyTube insulation. The compact 2 in, 0.037 lb design of the TR7R eases installation while maintaining a robust 200 kA breaking capacity, making it well suited for code-compliant protection in professional electrical work.

Manufacturer Resources

Product Specs

Body/Insulating Material:
PolyTube
Rated voltage AC UL:
250 V
Frequency (Hz):
50/60 Hz
AC Max I.R./Breaking Capacity: I1:
200 kA
Speed/Characteristic:
Time Delay
Rohs Compliant:
Yes
Mounting Method:
Clip
AC or DC:
AC/DC
Fuse Class:
Class RK5
Product Type:
Time-Delay Fuse
Product Group:
Circuit Protection
Department:
Electrical
Product Subgroup:
Fuses

Mersen TR4R – Frequently Asked Questions

1) Can I use a Mersen TR series fuse on a 480V panel?
No. The UL AC rating on the TR series is 250 V, so it is limited to 240V-class systems. For a 480V circuit you need a fuse rated 600 V, such as a Class RK5 or Class J in the 600V range.
2) Will a Mersen TR100R drop into my existing fuse block, or do I need a new holder?
The TR series mounts in standard clip-style fuse holders and blocks. Class RK5 shares Class R dimensions and the rejection feature, so it fits a Class R rejection block of the same amp range and voltage class. Match the holder to the amp rating: a 100A holder will not take a 10A fuse body and vice versa.
3) For a motor circuit that trips fuses on inrush, should I use the Littelfuse BLF midget fuse or a Mersen TR-R?
Use the time-delay fuse. The Mersen TR-R line is a Class RK5 time-delay fuse, which is built to ride through the temporary overload of motor starting while still clearing a sustained overcurrent. The Littelfuse BLF series is a fast-acting midget fuse rated 250V with a laminated tube body, intended for circuits where the fastest clearing time is wanted rather than inrush tolerance. A fast-acting fuse in a motor circuit is the usual cause of nuisance openings on start.
4) Is the Littelfuse CCMR040 a substitute for a Mersen TR-R Class RK5 time-delay fuse?
No. Both are time-delay fuses, but they are different fuse classes with different bodies and holders. The Mersen TR-R fuses are Class RK5 time-delay units rated 250 VAC that mount in clips sized for that class. The Littelfuse CCMR040 is a Class CC time-delay fuse in the CCMR series, a 40A rejection-style midget body that seats only in Class CC holders. A Class CC fuse will not fit an RK5 fuse clip or block, and an RK5 fuse will not fit a Class CC rejection holder, so the choice follows whatever holder is already in the panel.
5) What should I order to fuse a 600V metering circuit instead of a Mersen TR-R?
The Mersen TR-R Class RK5 fuses carry a 250 V AC rating, so they do not cover a 600 V metering tap. For that duty the Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses sized for meter potential circuits. Match the fuse holder and the circuit voltage rather than the amperage alone.
6) What amp ratings does the Mersen TR series RK5 fuse come in?
Five ratings: 4A (TR4R), 7A (TR7R), 10A (TR10R), 35A (TR35R) and 100A (TR100R). Order by the amp value you need and the part number follows the TR + amps + R pattern.
7) Is the Mersen TR RK5 fuse rated for DC circuits as well as AC?
Yes, the TR series carries both an AC and a DC rating, so it can be applied on DC control and battery circuits as well as 50/60 Hz AC. Use the DC rating printed for the specific amp code you are ordering when you size the circuit.
8) What interrupting rating do these Mersen RK5 fuses have for a high fault-current service?
200 kA AC interrupting rating. That covers the available fault current in most industrial control panels and distribution gear fed from a large transformer, and it is the figure your short-circuit current rating calculation needs.
9) Should I use a Class RK5 fuse or a Class CC fuse for motor branch protection?
It comes down to the holder and the panel space. The Mersen TR series is Class RK5 at 250 V, sized for 240V-class feeders, motor circuits and distribution blocks. If you are working in a compact control panel with Class CC rejection holders, a Class CC time-delay fuse like the Littelfuse CCMR040 is the one that physically fits. They are not interchangeable in the same block.
10) Can I substitute a midget or glass fuse for a Mersen TR RK5 fuse?
No. A midget fast-acting fuse such as the Littelfuse BLF series at 250V, or a glass tube fuse like the Littelfuse AGU or AGA5, is a different body size and a different speed characteristic. Swapping a fast-acting fuse into a motor circuit protected by a time-delay RK5 will open on every start. Stay with the RK5 time-delay for that duty.
11) I need a time-delay fuse in a compact midget footprint rather than the Mersen TR-R body - what is the option?
The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A in the CCMR series, which is the smaller rejection-style midget format used where panel space is tight. The Mersen TR-R fuses are Class RK5 time-delay units rated 250 VAC across amperages from 4A up to 100A, covering higher current than the Class CC range. Confirm the holder in the enclosure is prepped for Class CC before switching.
12) Is the Mersen TR fuse RoHS compliant for a spec that requires it?
Yes, the TR series is RoHS compliant, with copper connection terminals and a PolyTube insulating body. That satisfies the RoHS line item on most institutional and OEM panel specs.
13) Where do these Mersen Tri-Onic RK5 fuses typically get used in a building?
Industrial control panels, motor control centers, power distribution equipment, HVAC system controls, instrumentation circuits and general commercial electrical systems. For MRO stocking, carrying the 4, 7, 10, 35 and 100 amp ratings covers control-circuit through feeder duty on 240V-class gear.
How fast can I get the Mersen TR4R 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 TR4R come with a warranty?
Absolutely. The Mersen TR4R 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 TR4R?
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
Why buy the Mersen TR4R from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!