Mersen USCC Series UltraSafe Class CC Fuse Holder, IP20 Finger-Safe
The Mersen USCC Series UltraSafe Fuse Holder is a modular DIN-rail mounted fuse holder engineered for Class CC 1-1/2" x 13/32" AC and DC-rated fuses up to 30 amperes. Qualifying as "finger-safe" under IEC and DIN standards to an IP20 grade of protection, this holder allows safe fuse changing with the flick of a finger, even during energized operation. Built from tough, durable glass filled polycarbonate body material with exceptional insulating properties, it snaps onto standard 35mm DIN-rail and includes an LED blown-fuse indicator for fast visual troubleshooting.
Key Features
- Fuse Compatibility: Accepts Class CC 1-1/2" x 13/32" fuses rated up to 30A for reliable overcurrent protection.
- Finger-Safe IP20 Design: Qualifies as finger-safe under IEC and DIN standards, including safe fuse changing.
- Durable Construction: Glass filled polycarbonate body offers exceptional insulating properties and long-term durability.
- DIN-Rail Mounting: Snaps onto 35mm DIN-rail, saving up to 15% mounting space versus conventional holders.
- LED Blown-Fuse Indication: Integrated LED indicator provides fast visual confirmation of a blown fuse.
- Electrical Ratings: Rated 24V DC (UL), AC/DC operation, 50/60 Hz, with a wiring range of Cu #6-14 and a 15 lb-in torque rating.
- Short Circuit Protection: 200 kA short circuit current rating (SCCR) paired with Class CC fuses for Type "2" No Damage protection.
- Modular Configuration: Available in 1-pole configuration with clip-in fuse installation; multi-pole units can be field assembled with pin-tie handles.
Certifications & Compliance
- RoHS Compliant
- IP20 Finger-Safe Rating per IEC and DIN Standards
- UL-Rated Voltage (24V DC)
Technical Specifications
- Indication System Type: LED
- Indication System: Yes
- ROHS Compliant: Yes
Typical Applications
- DIN-Rail Panel Building and Control Cabinets
- Motor Control Centers and Industrial Control Panels
- Overcurrent Protection for AC/DC Circuits
- Panelboard and Switchgear Assemblies
- Renovation and New Construction Electrical Installations
Why Mersen?
Mersen UltraSafe fuse holders combine a durable glass filled polycarbonate body with a finger-safe IP20 design to help electrical professionals build safer, more compact panels. Backed by a 200 kA SCCR rating and RoHS compliance, the USCC Series delivers dependable, code-compliant overcurrent protection for Class CC fuse applications.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Indication System Type:
- LED
- Indication System:
- Yes
- Torque Rating:
- 15 lb-in
- Ampere Rating:
- 30 A
- ROHS Compliant:
- Yes
- Frequency (Hz):
- 50/60 Hz
- Number Of Poles:
- 1-Pole
- Wiring Range:
- Cu #6-14
- AC or DC:
- AC/DC
- Fuse Type Class:
- Class CC
- Short Circuit Current Rating Sccr:
- 200 kA
- Installation Mounting:
- DIN Rail
- Max Fuse Rating:
- 30 A
- Fuse Installation Method:
- Clip-in
- Rated voltage DC UL:
- 24 V
- Fuse Class:
- Class CC
- Body/Insulating Material:
- Glass Filled Polycarbonate
- list_batch:
- MERSEN-20260825
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Type:
- Fuse Holder
- Product Subgroup:
- Fuse Holders & Blocks
Mersen USCC1I-DC24 – Frequently Asked Questions
1) What fuses does the Mersen USCC1I-DC24 fuse holder take?
It takes Class CC fuses in the 1-1/2 inch x 13/32 inch case size, rated up to 30 amps. The fuse clips in rather than threading or screwing down. Class J, Midget, or Class CC-lookalike fuses in other case sizes will not seat correctly, so stay with a true Class CC element.
2) Is the USCC1I-DC24 holder rated for 24V DC only, or can I use it on AC circuits?
The holder is built for AC/DC operation at 50/60 Hz, and the UL DC rating on this particular model is 24V DC. If your DC bus runs above 24V, this is not the right model in the USCC family. On AC control circuits it works as a standard Class CC holder.
3) What wire size and torque should I use landing conductors on this Mersen fuse holder?
The terminals accept copper conductors from #14 up to #6 AWG, and the terminal screws torque to 15 lb-in. Use a torque screwdriver on panel work; under-torqued terminals on a 30A Class CC circuit are a heat problem waiting to happen.
4) Can I change the fuse in this holder while the panel is energized?
The USCC holder qualifies as finger-safe to IP20 under IEC and DIN standards, including during fuse changing, so the live parts stay shielded from finger contact. That does not override your site's arc-flash and lockout rules, but the holder itself is built so a fuse swap is done with a flick of a finger.
5) Will this Mersen holder mount on the 35mm DIN rail already in my control cabinet?
Yes. It snaps directly onto standard 35mm DIN rail, which is what the terminal blocks and breakers in a typical control cabinet already sit on. Mersen states the footprint saves up to 15 percent of mounting space compared with conventional holders, which matters when you are fitting a retrofit into an existing panel.
6) This is a 1-pole fuse holder. How do I protect a three-phase circuit with it?
The USCC1I-DC24 is a single-pole unit. For two- or three-pole protection you gang single-pole holders side by side on the rail and field assemble them with pin-tie handles so the poles operate together. Order one holder per pole plus the tie handles.
7) What is the short circuit current rating of the Mersen USCC Class CC fuse holder?
200 kA SCCR when used with Class CC fuses, which also gives Type 2 "No Damage" protection on the motor starter side. That rating is what lets the assembly carry a high series-rated SCCR on an industrial control panel label.
8) How do I tell at a glance which fuse has blown in a row of these holders?
Each USCC holder has an integrated LED blown-fuse indicator, so the failed pole lights up instead of you pulling fuses one at a time with a meter. That is the main reason to spec the indicating version over a plain holder in a cabinet with a dozen circuits.
9) Is a DIN-rail Class CC holder the right choice, or should I use an in-line or box cover fuse unit?
A DIN-rail Class CC holder like the USCC belongs inside a control cabinet or motor control center where fuses sit alongside breakers and terminal blocks on rail. For a wet or outdoor run that is not in an enclosure, an in-line holder such as the Littelfuse WPB1 Series watertight in-line fuse holder is the right form factor. For a plug-fuse circuit at a 125V 15A branch, that is a box cover unit job, like the Littelfuse LSRY Series.
10) For an outdoor or washdown location, should I use the Mersen USCC holder or something else?
The Mersen USCC UltraSafe holder is rated IP20 finger-safe, which protects against finger contact with live parts but is not a moisture rating, so it is intended for the inside of an enclosure or control cabinet on DIN rail. Where the holder itself is exposed, the Littelfuse WPB1 series is an in-line watertight fuse holder built for that duty. Keep the USCC on rail inside the panel and let the enclosure provide the environmental protection.
11) What makes the Mersen USCC holder different from a basic fuse holder when I am building a panel to a 200 kA SCCR spec?
The Mersen USCC UltraSafe holder carries a 200 kA short circuit current rating when paired with Class CC fuses, is IP20 finger-safe so fuses can be changed by hand, and uses a glass filled polycarbonate body. It also includes an LED blown-fuse indicator and terminates Cu #6-14 at 15 lb-in. Simpler holders such as the Littelfuse LSRY plug fuse box cover unit, rated 125V 15A, serve legacy fuse-box duty rather than DIN-rail panel assemblies, so they are not a swap where a Class CC rail-mounted holder is specified.
12) What is the body made of, and is it RoHS compliant?
The body is glass filled polycarbonate, chosen for its insulating properties and mechanical toughness in a panel environment. The holder is RoHS compliant, which is usually what a specifier or institutional procurement office is checking for on the submittal.
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Absolutely. The Mersen USCC1I-DC24 is backed by a manufacturer’s warranty.
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