Mersen RF Series Class H 250VA...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$51.71
Mersen RF Series Class H 250VAC Fast-Acting Renewable Fuse, 10kA

Mersen RF Series Class H 250VAC Fast-Acting Renewable Fuse, 10kA

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Model: RF25

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

$51.71
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Mersen RF Series Class H Fast-Acting Renewable Fuse, 250VAC

The Mersen RF Series is a general-purpose Class H renewable fuse rated 250VAC and built for circuits where available short-circuit current does not exceed 10,000 amperes. With a Fast-Acting speed characteristic, brass connection/terminal material, and an FWGE body/insulating material, this fuse delivers dependable overcurrent protection for standard branch-circuit and equipment applications. The RF Series is offered with a choice of Type of Connection — Blade or Ferrule — so it can be matched to the fuse block or clip configuration already installed in the panel or switchboard. The renewable design lets maintenance teams restore protection quickly using RL series die-cut zinc replacement fuse links, available from 2 to 600 amperes across 31 ratings, without swapping out the entire fuse holder.

Key Features

  • Fast-Acting Response: Class H fast-acting speed characteristic for reliable overcurrent interruption.
  • Interrupt Rating: 10 kA AC maximum breaking capacity (I1), suitable for circuits with available short-circuit current up to 10,000 amperes.
  • Voltage Rating: 250V AC rated (UL) for general-purpose branch-circuit protection.
  • Type of Connection: Available in Blade or Ferrule configurations with brass connection/terminal material for secure, low-resistance contact.
  • Frequency: Rated for 50/60 Hz AC systems.
  • Durable Construction: FWGE body/insulating material for a rugged, long-lasting housing.
  • Renewable Design: Compatible with RL series die-cut zinc replacement fuse links, available from 2 to 600 amperes in 31 ratings, minimizing downtime during maintenance.

Technical Specifications

  • AC or DC: AC
  • Type of Connection: Blade or Ferrule
  • Connection/Terminal Material: Brass
  • AC Max I.R./Breaking Capacity (I1): 10 kA
  • Frequency: 50/60 Hz
  • Speed/Characteristic: Fast-Acting
  • Rated Voltage AC (UL): 250 V
  • Fuse Class: Class H
  • Body/Insulating Material: FWGE

Typical Applications

  • General-Purpose Branch Circuit Protection
  • Commercial and Industrial Electrical Panels
  • Motor and Feeder Circuit Overcurrent Protection
  • Renewable Fuse Panelboards and Switchboards
  • Maintenance Replacement Using RL Series Fuse Links

Why Mersen?

Mersen RF Series Class H renewable fuses combine a durable FWGE body, brass terminal connections, and a fast-acting speed characteristic to deliver consistent, code-compliant overcurrent protection for general-purpose electrical systems. Offered in Blade and Ferrule connection styles, the RF Series fits a wide range of existing fuse holders while its renewable clip design paired with RL series replacement fuse links lets facilities maintain protection across a wide span of ratings without replacing the entire fuse holder. That combination of flexibility and durability makes Mersen a practical choice for professional electrical maintenance and construction work.

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Manufacturer Resources

Mersen Product Catalog

Product Specs

Mounting Method:
Clip
Connection/Terminal Material:
Brass
AC Max I.R./Breaking Capacity: I1:
10 kA
Frequency (Hz):
50/60 Hz
Speed/Characteristic:
Fast-Acting
Rated voltage AC UL:
250 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:
Renewable Fuse
Product Material:
FWGE
Connection Type:
Blade, Ferrule
Voltage Rating:
250V
Amperage Rating:
2A - 600A
Grade:
Class H
Product Subgroup:
Fuses

Mersen RF25 – Frequently Asked Questions

1) Can I use a Mersen RF Series Class H fuse on a 480V circuit?
No. The RF Series is rated 250V AC and can't be applied on a 480V system. It's a general-purpose Class H fuse for 250V AC branch circuits at 50/60 Hz. For a 480V feeder you need a 600V-rated fuse, typically Class J, RK1 or RK5 rather than Class H.
2) Should I order the Blade or the Ferrule version of the RF Series?
That's set by the fuse holder already in the gear, not by preference. Ferrule-style RF fuses go in the smaller clips used at lower amperages; blade (knife-blade) versions are the larger bodies used higher up the range. Pull the existing fuse and match the end style. Both use brass terminals and mount in clips. Orderable examples include RF25 in ferrule and RF100 in blade.
3) What does "renewable" mean on these Mersen RF fuses, and what do I buy to re-fuse one?
Renewable means the fuse body stays in service and only the internal link is replaced after a fault. For the RF Series you order RL series die-cut zinc replacement links, offered from 2 to 600 amps across 31 ratings. Maintenance crews keep a link kit on the shelf instead of a full set of fuses, and nothing about the holder or clips changes.
4) Will a fast-acting Class H fuse hold on motor inrush?
Fast-acting is the speed characteristic on the RF Series, so it opens quickly on overcurrent and gives no deliberate time delay for starting current. On a motor circuit that usually means sizing well above full-load amps or accepting nuisance openings. If you want a fuse that rides through inrush, a time-delay type is the better fit, for example the Littelfuse CCMR Series Class CC time-delay fuse (CCMR040 is the 40A rating).
5) Can I drop an RF Series fuse into a Class R or Class J fuse block?
No. Class H dimensions are the old NEC standard sizes and Class R blocks use a rejection feature that blocks a Class H fuse from seating, while Class J blocks are a different body size entirely. The RF Series belongs in Class H renewable panelboards, switchboards and fused switches using plain clips. If the gear has rejection clips, you need an R-class fuse instead.
6) We need fuses for a 600V metering circuit. Does the Mersen RF Series work, or is there a better option?
The Mersen RF Series is rated 250V AC (UL), so it is not applied on 600V circuits. For instrument metering, the Square D PowerLogic Energy Meter Fuse Pack is a set of three 0.5A 600V fuses supplied for PowerLogic energy meters. Use the RF Series where the system voltage is 250VAC or less and the fault current stays within its 10 kA breaking capacity.
7) What amp range do the Mersen RF renewable fuses cover?
The RF Series spans 2A through 600A, with the replaceable RL links available across that same range in 31 ratings. Ferrule bodies cover the lower end and blade bodies the upper end, so confirm which clip style your switch or panel uses before picking an amperage.
8) Is this the right fuse for control or electronics protection?
It isn't. The RF Series is a power fuse for branch-circuit and feeder protection in commercial and industrial panels, 250V AC, 2 to 600A. For small control, instrument or automotive-style loads look at a glass tube or midget fuse instead, such as the Littelfuse AGA Series (AGA5 is the 5A), the AGU Series glass tube, or the Littelfuse BLF Series 250V midget fast-acting fuse.
9) Can the Mersen RF Series be used on a DC circuit?
No, it's an AC-only fuse, rated 250V AC at 50/60 Hz. No DC rating applies, so don't use it on battery, solar DC or DC drive circuits.
10) Can I use a glass tube fuse like the Littelfuse AGU or AGA5 in place of a Mersen RF Series fuse?
No. The Littelfuse AGU is an AG glass tube fuse and the AGA5 is a 5A AGA Series glass fuse; both are small glass-body fuses for low-current electronic and automotive-style circuits. The Mersen RF Series is a Class H 250VAC renewable fuse covering 2A to 600A with brass blade or ferrule terminals and an FWGE insulating body for branch-circuit and equipment protection in panels and switchboards. A glass fuse will not seat in Class H clips or carry those ratings.
11) If I want a time-delay fuse instead of a fast-acting one for a motor circuit, what is the alternative to the Mersen RF Series?
The Mersen RF Series carries a fast-acting speed characteristic, which clears quickly on overcurrent. Where a motor circuit needs a fuse that rides through inrush, the Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. Confirm the holder, since the RF Series uses Class H blade or ferrule clip mounting rather than a Class CC rejection holder.
12) What are RF Series fuse bodies and terminals made of?
Terminals and blades are brass for low-resistance contact in the clips, and the body/insulating material is FWGE. That construction is what lets the body be reused repeatedly as RL links are replaced.
How fast can I get the Mersen RF25 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 RF25 come with a warranty?
Absolutely. The Mersen RF25 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 RF25?
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 RF25 from ZenSupply?
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