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Mersen Modulostar 14x51 Fuse Holder, 1-Pole IP20
The Mersen Modulostar® fuse holder is a finger-safe, IEC-rated modular fuse holder built for size 14x51 fuses in a 1-Pole configuration. Rated 690VAC and 690VDC with an IP20 grade of protection, it allows fuse changing with the flick of a finger while meeting IEC finger-safety standards. Constructed of tough, durable thermoplastic/thermoset material and mounted on DIN rail per EN 60715, it is engineered for reliable circuit protection in demanding industrial environments.
Key Features
- Fuse Size: Accepts 14x51 fuse links for precise circuit protection.
- Durable Construction: Tough thermoplastic/thermoset material resists wear in industrial settings.
- 1-Pole Configuration: Modular design with IP20 finger-safe protection for safe fuse changing.
- Electrical Ratings: Rated 690VAC and 690VDC with a 690V rated insulation voltage and 50A ampere rating.
- High SCCR: Short Circuit Current Rating (SCCR) of 100 kA for robust fault protection.
- DIN Rail Mounting: Installs on DIN rail acc. EN 60715 for standardized panel integration.
- Rated Impulse Withstand Voltage: 8 kV for enhanced dielectric protection.
Certifications & Compliance
- RoHS Compliant
- IEC Finger-Safe to IP20 Protection Grade
- Rated Insulation Voltage: 690 V (IEC)
Technical Specifications
- ROHS Compliant: Yes
- Torque Rating: 30.978 lb-in
- Ampere Rating: 50 A
- Rated voltage DC IEC: 690 V
- Rated voltage AC IEC: 690 V
- Conventional Free Air thermal Current With Fuse-Links Ith: 50 A
- Number of Poles: 1-Pole
- Rated Insulation Voltage: 690 V
- AC or DC: AC/DC
- Short Circuit Current Rating (SCCR): 100 kA
- Installation Mounting: DIN rail acc. EN 60715
- Fuse Size: 14x51
- Rated Impulse Withstand Voltage: 8 kV
- Packaging: 6 EA
Typical Applications
- Industrial Control Panels
- Motor Control Centers
- DIN Rail Electrical Enclosures
- Circuit Protection for Combined AC/DC Systems
- Panelboard and Switchgear Fuse Protection
Why Mersen?
Mersen's Modulostar® range combines IEC finger-safe IP20 protection with a 100 kA SCCR and 690V AC/DC insulation rating, delivering dependable circuit protection built on tough thermoplastic/thermoset construction. Backed by RoHS compliance and standardized DIN rail mounting, this fuse holder is engineered for code-compliant performance in professional electrical and industrial control installations.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- list_batch:
- MERSEN-20260825
- Product Type:
- Fuse Holder
- Configuration:
- 1-Pole
- Voltage Rating:
- 690V
- Amperage Rating:
- 50A
- Standards:
- IEC
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuse Holders & Blocks
Mersen A331016 – Frequently Asked Questions
1) What fuse size does the Mersen Modulostar A331016 fuse holder accept?
It takes size 14x51 cylindrical fuse links, one per holder. A 10x38 or 22x58 link will not seat in it, so match the fuse body size before ordering. The holder itself is rated 50A, which is the ceiling for the link you install in it.
2) Can the Mersen Modulostar 14x51 holder be used on a DC circuit, not just AC?
Yes, it is rated AC/DC: 690VAC and 690VDC, with a 690V rated insulation voltage and 8kV rated impulse withstand. That makes it usable in combined AC/DC industrial control systems as well as straight AC panels.
3) What short circuit current rating does the Mersen A331016 fuse holder have?
100 kA SCCR, which is what lets it be applied in motor control centers and industrial control panels with high available fault current. The matching ratings are 690V insulation and 8kV impulse withstand.
4) I need a 3-phase circuit protected. Is one Modulostar 14x51 holder enough?
No. The A331016 is a 1-pole holder, so a three-phase feeder needs three of them (or four if you are fusing a neutral). They are modular and sit side by side on the same DIN rail, so you gang as many poles as the circuit requires.
5) Can a Littelfuse WPB1 in-line watertight fuse holder be used instead of the Mersen A331016?
No, those two solve different problems. The Mersen A331016 Modulostar is a 1-pole, DIN rail mounted holder for 14x51 fuse links, rated 690V AC/DC at 50A with a 100 kA SCCR, intended to sit inside an industrial control panel or enclosure on DIN rail per EN 60715. The Littelfuse WPB1 is an in-line watertight fuse holder, meaning it is spliced into a wire run rather than mounted to rail inside a panel. If the fuse has to live in a panel on DIN rail, the Modulostar is the right form factor; if the fuse has to sit out on a cable in a wet location, an in-line watertight holder is the style you want.
6) Is the Littelfuse LSRY plug fuse box cover unit an alternative to the Mersen Modulostar 14x51 holder?
They are not interchangeable. The Littelfuse LSRY series is a plug fuse box cover unit rated 125V and 15A, built around screw-in plug fuses for residential-style fuse boxes. The Mersen A331016 Modulostar accepts 14x51 cylindrical fuse links, is rated 690V AC and 690V DC to IEC with a 50A ampere rating and 100 kA SCCR, and mounts on DIN rail. For an IEC industrial control panel at 690V, the Modulostar is the applicable device; the LSRY addresses a legacy plug-fuse panel at 125V.
7) How does the Mersen Modulostar fuse holder mount in a control panel?
It mounts on standard DIN rail per EN 60715, so it snaps alongside breakers, terminal blocks and relays in a typical enclosure. No separate panel drilling or back-plate adapter is involved.
8) Is this fuse holder finger-safe for changing fuses in a live panel?
The Modulostar carries an IP20 grade of protection and meets IEC finger-safety requirements, and the carrier pulls out with the flick of a finger. IP20 means protection against solid objects down to 12.5mm (finger contact) with no water ingress rating, so it is an enclosed-panel device, not a wet-location holder.
9) What torque should the terminals on the Modulostar fuse holder be tightened to?
Terminal torque is 30.978 lb-in. Under-torqued terminals are the usual cause of heating at a fuse holder, so set a driver rather than guessing by feel.
10) I need a fused disconnect point out on a cable rather than in the panel - what should I look at instead of the Mersen A331016?
For a fuse carried on the cable run instead of inside an enclosure, look at an in-line watertight style such as the Littelfuse WPB1 series in-line watertight fuse holder, which is designed to be installed in the wire itself. The Mersen A331016 Modulostar is built the other way around: it is a modular 1-pole holder that mounts to DIN rail per EN 60715 with IP20 finger-safe protection, which assumes it is inside a panel or enclosure where IP20 is sufficient. Match the holder to where the fuse physically has to sit.
11) Is the Mersen Modulostar sold individually or in a multi-pack?
Packaging is 6 each, so it comes as a six-piece pack. Useful if you are building out a multi-pole arrangement or standardizing a panel shop on one holder.
12) Is the Mersen Modulostar fuse holder RoHS compliant?
Yes, the Modulostar 14x51 holder is RoHS compliant and built to IEC standards, with a 690V rated insulation voltage. That is the combination most institutional and industrial procurement specs ask for on panel components.
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Does the Mersen A331016 come with a warranty?
Absolutely. The Mersen A331016 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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