Mersen RLS Series Class H Rene...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$8.31
Mersen RLS Series Class H Renewable Fuse Link, 600V Fast-Acting

Mersen RLS Series Class H Renewable Fuse Link, 600V Fast-Acting

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Model: RLS20

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

$8.31
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Mersen RLS Series Class H Renewable Fuse Links, 600V Fast-Acting

The Mersen RLS Series is a die-cut zinc renewable fuse link family designed to re-link Mersen RFS Class H fuse holders instead of requiring full fuse replacement. This family covers Motor FLA ratings from 5A up to 110A, giving maintenance teams a single, cost-effective source for restoring overcurrent protection across a wide span of branch-circuit and motor-circuit loads. Rated 600V AC for 50/60 Hz systems with a Fast-Acting speed/characteristic, the RLS links are built for AC circuits where available short-circuit current does not exceed 10,000 amperes. Because the RLS link is renewable, the fuse holder itself is reused after a fault event, reducing waste and total cost of ownership for facilities that standardize on Class H renewable fuses.

Key Features

  • Amperage Range: Available across Motor FLA ratings of 5A, 6A, 10A, 15A, 20A, 25A, 30A, 40A, 50A, 60A, 80A, 100A, and 110A to match a wide range of branch and motor circuit loads.
  • Fuse Class: Class H renewable design for general-purpose overcurrent protection.
  • Voltage Rating: Rated 600V AC for standard commercial and industrial circuits.
  • Frequency: Designed for 50/60 Hz AC systems.
  • Speed/Characteristic: Fast-Acting response for applications requiring quick fault clearing.
  • Short-Circuit Rating: Suitable for AC circuits where available short-circuit current does not exceed 10,000 amperes.
  • Renewable Design: Die-cut zinc construction lets the RFS fuse holder be re-linked and reused instead of discarded after an overcurrent event.
  • Packaging: Supplied 20 EA per package for stocking and maintenance use.

Technical Specifications

  • AC or DC: AC
  • Frequency (Hz): 50/60 Hz
  • Speed/Characteristic: Fast-Acting
  • Rated Voltage AC UL: 600 V
  • Fuse Class: Class H
  • Motor FLA Options: 5A, 6A, 10A, 15A, 20A, 25A, 30A, 40A, 50A, 60A, 80A, 100A, 110A
  • Packaging: 20 EA

Typical Applications

  • Commercial and Industrial Electrical Distribution
  • General-Purpose Branch Circuit Protection
  • Motor Circuit Overcurrent Protection
  • Panelboard and Fusible Switch Applications
  • Facilities Requiring Renewable Fuse Maintenance
  • AC Circuits with Short-Circuit Currents Up to 10,000A

Why Mersen?

Mersen's RLS renewable fuse links pair Fast-Acting response with a die-cut zinc construction that keeps RFS Class H fuse holders in service instead of scrapping them after every fault. Spanning Motor FLA ratings from 5A to 110A at 600V AC, 50/60 Hz, and rated for short-circuit currents up to 10,000 amperes, the RLS series gives electrical teams a consistent, code-aware way to maintain overcurrent protection across a wide range of branch and motor circuits. Shop the full Mersen fuse lineup at ZenSupply for reliable, professional-grade circuit protection.

Manufacturer Resources

Mersen Product Catalog

Product Specs

AC or DC:
AC
Frequency (Hz):
50/60 Hz
Speed/Characteristic:
Fast-Acting
Rated voltage AC UL:
600 V
Fuse Class:
Class H
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fuse Link
Product Material:
Zinc
Voltage Rating:
600V
Amperage Rating:
5A - 110A
Listing:
UL Listed
Product Subgroup:
Fuses

Mersen RLS20 – Frequently Asked Questions

1) What does a Mersen RLS renewable fuse link actually do, and do I need the fuse holder too?
The RLS is the replaceable element only, not a complete fuse. It is a die-cut zinc link that drops into a Mersen RFS Class H renewable fuse holder, so after a fault you re-link the holder instead of scrapping the whole fuse. If you don't already have RFS holders in the switch, the link by itself won't protect anything, you need the holder as well.
2) Will a Mersen RLS link work on a 240V or 480V circuit, or is it 600V only?
Rated 600V AC, which is the maximum, so it is fine on lower AC system voltages such as 240V or 480V. It is an AC-only device for 50/60 Hz systems, so don't use it on DC circuits.
3) Can I use Class H renewable fuse links in a panel with high available fault current?
No. Class H renewable links such as the RLS are rated for AC circuits where available short-circuit current does not exceed 10,000 amperes. If your service calculation puts available fault current above that at the fuse location, a Class H renewable link is the wrong choice and you need a current-limiting class of fuse instead, such as a Class CC or Class RK device.
4) Is a Fast-Acting link the right pick for a motor circuit, or do I need time-delay?
The RLS links are Fast-Acting, so they clear quickly and suit circuits where you want fast fault interruption. On a motor circuit the inrush on start can nuisance-open a fast-acting element if it is sized to the running FLA, so for across-the-line motor starting a time-delay fuse is usually the better fit. We carry the Littelfuse CCMR Series Class CC time-delay fuse, for example the CCMR040 at 40A, when you need the delay to ride through starting current.
5) Is a Littelfuse CCMR040 Class CC fuse a substitute for a 40A Mersen RLS renewable link?
No. The Mersen RLS40 is a Class H renewable fuse link, a die-cut zinc element rated 600V AC, Fast-Acting, that is installed into a Mersen RFS Class H fuse holder to restore protection. The Littelfuse CCMR040 is a Class CC time-delay fuse at 40A, a complete sealed fuse with its own body and Class CC rejection dimensions, so it mounts in Class CC rejection clips rather than an RFS holder. If the gear has Class CC fuse blocks, go to the CCMR; if it has RFS renewable holders, use the RLS link. The time-delay characteristic of the CCMR is also the opposite of the RLS Fast-Acting response for motor inrush.
6) Is the Square D PowerLogic fuse pack an alternative to a small Mersen RLS link for metering circuits?
For a metering circuit, the Square D PowerLogic energy meter fuse pack is the purpose-built option: it is supplied as a set of 3 rated 0.5A at 600V for PowerLogic meter voltage inputs. The Mersen RLS family starts at a 5A Motor FLA rating, so it does not reach the half-amp level a meter input needs, and it is a Class H renewable link intended for RFS holders in branch and motor circuits. Use the PowerLogic pack for the meter taps and RLS links for the fusible switch protection.
7) What amp sizes do Mersen RLS fuse links come in?
Thirteen Motor FLA ratings are offered: 5A, 6A, 10A, 15A, 20A, 25A, 30A, 40A, 50A, 60A, 80A, 100A and 110A, ordered as RLS5 through RLS110. That span covers small control and lighting branch circuits up through larger motor feeders on one part family, which is why MRO stockrooms standardize on it.
8) Why choose a renewable Class H fuse instead of a one-time fuse?
Cost and waste. With a renewable setup the RFS holder stays in the switch and you replace only the zinc link after a fault, instead of discarding a complete fuse each time. The trade-off is the 10,000 ampere short-circuit ceiling on Class H and a Fast-Acting curve rather than a time-delay one. Facilities that already standardize on Class H renewable holders get the most out of it; a new installation with higher available fault current should be fused with a current-limiting class instead.
9) Can an RLS link replace a glass tube or midget fuse in my equipment?
No. The RLS is a zinc link element for Mersen RFS Class H renewable holders and has no relation to glass or midget fuse bodies. For those you want the actual fuse type the equipment takes, for instance the Littelfuse AGU glass tube fuse, the AGA5 5A glass fuse, or the Littelfuse BLF Series 250V midget fast-acting fuse.
10) Can I use a Littelfuse BLF midget fuse instead of a Mersen RLS link in a 600V fusible switch?
No. The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube, so it is not applicable to a 600V circuit and its midget body does not fit an RFS Class H renewable holder. Mersen RLS links are rated 600V AC, 50/60 Hz, UL Listed, and are the element that re-links an RFS holder. The two share a fast-acting characteristic, but the voltage rating and the mounting are different, so the BLF belongs in 250V midget fuse blocks only.
11) My 5A circuit needs a fuse - how is a Littelfuse AGA5 different from a Mersen RLS5?
Both carry a 5A rating, but they serve different equipment. The Littelfuse AGA5 is an AGA Series glass fuse, a small sealed glass-tube cartridge typical of low-voltage and automotive style holders. The Mersen RLS5 is a Class H renewable fuse link rated 600V AC that drops into a Mersen RFS fuse holder and is replaced as a link rather than as a whole fuse. For branch-circuit or motor-circuit protection in a fusible switch or panelboard with RFS holders, the RLS5 is the correct part.
12) We stock Littelfuse AGU glass tube fuses - do they cover the same maintenance as Mersen RLS links?
They do not overlap. The Littelfuse AGU Series is an AG glass tube fuse supplied in a boxed package, used in glass-tube fuse holders and discarded after it opens. The Mersen RLS family is a zinc renewable link that restores a Mersen RFS Class H holder, covering Motor FLA ratings from 5A to 110A at 600V AC. A facility standardized on renewable Class H holders stocks RLS links by amp rating; a glass-tube holder cannot accept one.
13) How many RLS links come in a package?
They are supplied 20 each per package, which is set up for stockroom and maintenance use rather than a single swap. If you re-link regularly, one package of the amp size you run covers a lot of fault events.
How fast can I get the Mersen RLS20 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 RLS20 come with a warranty?
Absolutely. The Mersen RLS20 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 RLS20?
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 RLS20 from ZenSupply?
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