Mersen RFS Series Class H Fast...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$119.54
Mersen RFS Series Class H Fast-Acting Fuse, 600VAC

Mersen RFS Series Class H Fast-Acting Fuse, 600VAC

(No reviews yet) Write a Review

Model: RFS15

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

$119.54
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 RFS Series Class H Fast-Acting Fuse, 600VAC

The Mersen RFS Series is a general purpose Class H renewable fuse line built for fast-acting protection on 600VAC AC systems where available short-circuit currents do not exceed 10,000 amperes. This family is available with a choice of terminal connection style — Blade or Ferrule — so electrical professionals can match the fuse to the mounting configuration of their existing fuse holders and disconnects. Each fuse in the RFS Series uses a clip mount design with brass connection/terminal material and an FWGE body/insulating material, and is rated for standard 50/60 Hz AC service. Because these are renewable fuses, blown elements can be restored using RLS series die-cut zinc replacement links, available from 3 to 600 amperes across 30 ratings, extending the service life of the fuse body without requiring full replacement. The RFS Series covers a range of ampere ratings within the Class H category for panelboards, disconnects, and general circuit protection where code-compliant, renewable overcurrent protection is required.

Key Features

  • Speed/Characteristic: Fast-Acting response for Class H general purpose protection.
  • Rated Voltage AC (UL): 600V for line and equipment-level protection.
  • Fuse Class: Class H, suitable where available short-circuit currents do not exceed 10,000 amperes.
  • Connection Style Options: Available in Blade or Ferrule terminal configurations to fit different fuse holder styles.
  • Terminal Material: Brass connection/terminal construction for a reliable clip-mount contact surface.
  • Mounting: Clip mount design compatible with standard fuse holders.
  • Body/Insulating Material: FWGE construction for the fuse housing.
  • Frequency: Rated for 50/60 Hz AC systems.
  • Renewable Design: Restorable using RLS series die-cut zinc replacement links, 3 to 600 amperes in 30 ratings.

Certifications & Compliance

  • Rated Voltage AC UL: 600V

Technical Specifications

  • Mounting: Clip
  • Connection/Terminal Material: Brass
  • Type of Connection: Blade or Ferrule (select at checkout)
  • Frequency (Hz): 50/60 Hz
  • Speed/Characteristic: Fast-Acting
  • Rated voltage AC UL: 600V
  • AC or DC: AC
  • Fuse Class: Class H
  • Body/Insulating Material: FWGE

Typical Applications

  • General Purpose Overcurrent Protection
  • Panelboard and Load Center Circuits
  • Disconnect Switch Fuse Protection
  • Commercial and Industrial AC Systems
  • Renewable Fuse Holder Retrofits

Why Mersen?

Mersen RFS Series fuses combine a Class H fast-acting design with a renewable construction, so brass terminal connections and an FWGE body support dependable performance across 600VAC AC applications rated up to 10,000 amperes of available short-circuit current. Offering both Blade and Ferrule connection styles lets you standardize on one trusted fuse family across multiple holder types. The ability to restore the fuse using RLS series replacement links gives electrical professionals a code-compliant, cost-effective way to maintain protection over the life of the installation. Choose Mersen RFS Series fuses for reliable, general purpose overcurrent protection built to professional electrical standards.

"

Manufacturer Resources

Mersen Product Catalog

Product Specs

Mounting Method:
Clip
Connection/Terminal Material:
Brass
Frequency (Hz):
50/60 Hz
Speed/Characteristic:
Fast-Acting
Rated voltage AC UL:
600 V
AC or DC:
AC
Fuse Class:
Class H
Body/Insulating Material:
FWGE
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fast-Acting Fuse
Voltage Rating:
600V
Product Material:
Brass
Series:
RFS
Product Subgroup:
Fuses

Mersen RFS15 – Frequently Asked Questions

1) Can I use a Mersen RFS Class H fuse on a panel with high available fault current?
No. Class H fuses, including the Mersen RFS Series, are rated only where available short-circuit current does not exceed 10,000 amperes. If your utility or transformer calculation puts available fault current above that, a Class H renewable fuse is the wrong choice and you need a current-limiting class instead, such as a Class CC fuse like the Littelfuse CCMR Series. Check the available fault current at the panel before you commit to Class H.
2) Do I order the Blade or the Ferrule version of the Mersen RFS fuse?
That depends on your existing holder or disconnect. The RFS Series comes in two terminal styles: Blade (knife-blade) and Ferrule (cylindrical end caps). Smaller ampere ratings in Class H are ferrule style and larger ratings go to blade, so match the fuse to the clips already in the switch. RFS15 is the ferrule part and RFS100 is the blade part. Both are clip mount with brass terminals.
3) What does it mean that the Mersen RFS fuse is renewable, and what do I buy to restore it?
The RFS body is reusable. When the element opens you replace the link rather than scrapping the fuse. Mersen RLS series die-cut zinc replacement links fit the RFS, and they run from 3 to 600 amperes across 30 ratings. For MRO stock that means one set of fuse bodies in the switch and a drawer of links, instead of a full fuse for every amp rating.
4) Will a Mersen RFS fuse protect a motor circuit with inrush?
Probably not well. The RFS Series is a fast-acting characteristic, so it clears quickly and will tend to open on motor starting inrush. For motor and transformer loads you want a time-delay fuse, such as the Littelfuse CCMR Series Class CC time-delay. Use the RFS for general purpose branch and feeder protection, disconnect switches, and panelboard circuits.
5) Is there a time-delay alternative if the Mersen RFS keeps opening on motor inrush?
The Mersen RFS Series is a fast-acting characteristic, which clears quickly and is not intended to ride through motor starting current. A time-delay option in the same voltage family is the Littelfuse CCMR040, a Class CC time-delay fuse rated 40A. It requires a Class CC holder rather than the RFS Series clip-mount Blade or Ferrule arrangement, so confirm your fuse block before switching.
6) What is the difference between the Mersen RFS fuse and a Littelfuse BLF midget fuse?
Both are fast-acting designs, but they are not interchangeable. The Mersen RFS Series is a Class H fuse rated 600VAC with brass terminals and an FWGE body, available in Blade or Ferrule connection. The Littelfuse BLF Series is a midget fast-acting fuse rated 250V in a laminated tube body, a physically smaller format intended for midget-size clips. Match the holder size and the voltage rating of the circuit before substituting either way.
7) Is the Mersen RFS fuse rated for 240V as well as 600V systems?
The RFS Series carries a 600VAC UL rating, and a fuse may be applied at any system voltage at or below its rating. So it works on 600V, 480V, 240V, and 208V AC systems at 50 or 60 Hz. It is an AC-only fuse, so do not apply it on a DC circuit.
8) Can I use a Mersen RFS to replace a glass tube or midget fuse?
No, those are different form factors and ratings. Glass tube fuses like the Littelfuse AGA and AGU series, and midget fuses like the Littelfuse BLF Series (250V), sit in their own holders and will not interchange with a Class H clip-mount RFS body. Replace like for like: an RFS goes into Class H fuse clips in a disconnect or panelboard.
9) Can I standardize one fuse family across different holder types in my building?
That is the practical case for the RFS Series. The same Class H fast-acting family is offered in both Blade and Ferrule terminal styles, so a property or facilities group can spec one Mersen line across disconnects and panelboards with different clip configurations, and keep a single set of RLS links on the shelf to restore them.
10) My metering compartment needs a small 600V control fuse - is the Mersen RFS the right part?
For metering circuits, the Square D PowerLogic Energy Meter Fuse Pack supplies a set of three 0.5A 600V fuses sized for meter inputs. The Mersen RFS Series is a Class H fast-acting fuse rated 600VAC intended for general purpose overcurrent protection in panelboards and disconnect switches, with Blade or Ferrule clip-mount terminals, so it serves the feeder or branch side rather than a meter input tap.
11) What is the RFS fuse body made of, and does it hold up in a hot industrial enclosure?
The housing uses an FWGE body and insulating material with brass connection terminals. Brass clip contact surfaces are the standard for Class H fuse clips and hold contact pressure in disconnect switches and panelboards. Nothing in the Mersen data assigns a temperature derating to the RFS, so size it by the ampere rating of the circuit.
How fast can I get the Mersen RFS15 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 RFS15 come with a warranty?
Absolutely. The Mersen RFS15 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 RFS15?
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 RFS15 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.
!