Mersen OTS Class K5 Fast-Actin...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$36.11
Mersen OTS Class K5 Fast-Acting Fuse, 600VAC/300VDC

Mersen OTS Class K5 Fast-Acting Fuse, 600VAC/300VDC

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Model: OTS6

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

$36.11
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Mersen OTS6 Class K5 Fast-Acting Fuse, 6A 600VAC/300VDC Ferrule Terminal

The Mersen OTS6 Class K5 Fast-Acting Fuse delivers reliable overcurrent protection for both AC and DC circuits, rated 6A at 600VAC/300VDC with a 50kA breaking capacity. Built with ferrule terminal connections, copper terminal material, and paper body insulation, this fast-acting fuse is engineered for dependable clip-mount installation in professional electrical systems. RoHS compliant construction ensures the OTS6 meets responsible manufacturing standards while delivering rapid fault clearing to protect connected equipment.

Key Features

  • 6A Current Rating: Provides precise overcurrent protection for medium-load circuits and equipment applications.
  • 600VAC/300VDC Dual Voltage: Offers flexible protection for both alternating and direct current systems up to rated voltages.
  • Class K5 Fast-Acting Response: Delivers rapid fault clearing to minimize equipment damage and system downtime.
  • 50kA Breaking Capacity: Handles high fault currents safely, ensuring reliable protection under severe fault conditions.
  • Ferrule Terminal Design: Enables secure, professional connections with copper terminals for optimal conductivity.
  • Paper Body Insulation: Provides effective electrical isolation with proven insulating material technology.
  • Clip Mounting: Supports versatile, secure installation in standard fuse holders and blocks.
  • Compact Footprint: Measures 5 in. in length and weighs just 0.11 lb for space-efficient panel layouts.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Rohs Compliant: Yes
  • Fuse Class: Class K5
  • Ampere Rating: 6A
  • Rated Voltage AC: 600V
  • Rated Voltage DC: 300V
  • AC Max Breaking Capacity: 50 kA
  • Connection Terminal Type: Ferrule
  • Connection Terminal Material: Copper
  • Body Insulating Material: Paper
  • Mounting Method: Clip
  • Frequency: 50/60 Hz
  • Speed Characteristic: Fast-Acting
  • Product Length: 5 in
  • Product Weight: 0.11 lb

Typical Applications

  • Industrial Control Panels and Motor Control Centers
  • Commercial HVAC and Lighting Systems
  • Power Distribution Equipment Protection
  • Electronic Equipment and Instrumentation Circuits
  • Renewable Energy System Protection
  • Process Control and Automation Systems

Why Mersen?

Mersen delivers proven reliability in electrical protection with RoHS compliant construction, precision-engineered copper ferrule terminals, and professional-grade paper insulation. The compact 5-inch design and 0.11 lb lightweight construction ensure versatile installation while the Class K5 fast-acting response and 50kA breaking capacity provide robust, code-compliant protection for demanding industrial and commercial applications.

Manufacturer Resources

Product Specs

Connection Terminal Material:
Copper
Product Group:
Wiring Devices
Rohs Compliant:
Yes
Rated Voltage Ac Ul:
600 V
Frequency Hz:
50/60 Hz
Ac Max I R Breaking Capacity I1:
50 kA
Rated Voltage Dc Ul:
300 V
Fuse Class:
Class K5
Speed Characteristic:
Fast-Acting
Ac Or Dc:
AC/DC
Connection Terminal Type:
Ferrule
Department:
Electrical
Mounting Method:
Clip
Product Type:
Fuse

Mersen OTS6 – Frequently Asked Questions

1) Can the Mersen OTS fuse be used on a DC circuit, or is it AC only?
The Mersen OTS Class K5 fuse is rated for both: 600V AC and 300V DC, and the data sheet lists it as an AC/DC device. On AC it is rated 50/60 Hz. Don't apply it above 300V on the DC side even though the AC rating is higher, since the DC interrupting rating is the limiting one on battery, solar, and drive-bus circuits.
2) Will a Class K5 fuse fit my existing Class H or Class K fuse blocks?
The OTS is a ferrule-terminal, clip-mounted fuse, so it drops into standard clip-style fuse holders and blocks rather than bolting down. Class K5 fuses are built to the same NEC dimensional envelope as Class H fuses of the same amperage and voltage, which is why they are the usual upgrade path when you want a higher interrupting rating in an existing 600V holder. Below 60A on a 600V rating, ferrule ends are the norm.
3) Should I use a fast-acting fuse or a time-delay fuse for a motor circuit?
The OTS is fast-acting, so it clears quickly on fault and will not ride through motor inrush. Use it for feeder and branch protection, control transformers, lighting, and electronic or instrumentation loads where there's no big starting surge. For across-the-line motor starting you want a time-delay fuse instead, such as the Littelfuse CCMR Series Class CC time-delay fuse (CCMR040 is the 40A version). Sizing a fast-acting fuse large enough to survive motor inrush gives up the overload protection you were trying to buy.
4) What is the difference between the Mersen OTS fuse and the Littelfuse CCMR040 when I need a 40A fuse at 600V?
They are different fuse classes with different response curves. The Mersen OTS is a Class K5 fast-acting fuse rated 600VAC and 300VDC, offered in 30A, 40A and 60A amperages among others, with ferrule terminals for clip mounting. The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. Class CC fuse holders are rejection-style and dimensionally distinct from the Class K5 ferrule body, so the two are not interchangeable in the same block. Choose the time-delay CCMR040 where motor or transformer inrush would nuisance-open a fast-acting element, and the OTS40 where you want rapid clearing on a feeder or general purpose circuit.
5) Can a Littelfuse BLF midget fuse replace a Mersen OTS fuse?
No. The Littelfuse BLF is a midget fast-acting fuse rated 250V, while the Mersen OTS is rated 600VAC and 300VDC, so the BLF cannot be applied on a 480V or 600V circuit where an OTS is installed. The midget body is also a smaller physical format than the OTS ferrule fuse, which measures 5 inches in length and mounts in clips sized for it. Both share a fast-acting element, so the BLF is a reasonable choice only on low-voltage control circuits that never see the OTS voltage class.
6) What amp ratings does the Mersen OTS fuse come in?
Four amperages: 6A (OTS6), 30A (OTS30), 40A (OTS40) and 60A (OTS60). All share the same Class K5 fast-acting characteristic and the 600VAC/300VDC rating, so you can standardize a panel on the series and only change the ampere rating per circuit.
7) Is the Mersen OTS the same thing as a glass tube fuse like an AGU or AGA?
No. The OTS is a 600VAC/300VDC industrial power fuse with a paper body and copper ferrules, built for panel and distribution work. Glass tube fuses such as the Littelfuse AGA Series or AGU Series are low-voltage electronic and automotive style fuses and are not a substitute in a 600V fused disconnect. The Littelfuse BLF Series is a midget fast-acting fuse rated 250V, which likewise won't cover a 600V circuit.
8) Can I use the Mersen OTS to protect a solar or battery DC bus?
Within 300V DC, yes. The OTS is rated AC/DC with a 300V DC limit, and the description names renewable energy system protection among its applications. Above 300V on the array or battery string, this is the wrong fuse. Remember it's fast-acting, which suits DC fault clearing but gives no inrush tolerance for inverter or capacitor charging surges.
9) I need a small fuse for an instrument or electronics circuit, not a 600V feeder. What should I use instead of the Mersen OTS?
For low-voltage electronics and instrumentation, a glass tube fuse is the usual format. The Littelfuse AGA5 is a 5A AGA series glass fuse, and the Littelfuse AGU series is an AG glass tube fuse supplied boxed. Both are small glass-body cartridge fuses intended for equipment-level protection. The Mersen OTS is a different animal: a 600VAC/300VDC Class K5 fuse with a paper body and copper ferrule terminals, sized for clip mounting in power distribution blocks and control panels, with a 50 kA AC breaking capacity for fault-current duty.
10) Is the Mersen OTS the right fuse for the potential circuit on a PowerLogic energy meter?
For metering potential taps, the purpose-matched item is the Square D PowerLogic energy meter fuse pack, a set of three 0.5A 600V fuses sized for that duty. The Mersen OTS shares the 600VAC rating but its smallest amperage is 6A, which is far above what a meter voltage input needs, and it is built as a Class K5 fast-acting ferrule fuse for distribution and control panel protection. Use the OTS on the feeder or equipment circuit and the meter-specific pack on the instrument taps.
11) Which of these fuses can I use on a DC circuit such as a solar or battery system?
The Mersen OTS is the one rated for both, carrying an AC/DC rating of 600VAC and 300VDC at 50/60 Hz, which is why it turns up in renewable energy and DC equipment protection. The Littelfuse CCMR040 is a Class CC time-delay fuse and the Littelfuse BLF is a 250V midget, neither of which is described with a DC rating in the same terms. If the application is a DC string or battery circuit within 300V, the OTS in the amperage you need is the direct choice.
12) Is the Mersen OTS fuse RoHS compliant for a spec submittal?
Yes, the OTS series is RoHS compliant. That covers the restricted-substance line item on most institutional and government submittal packages. Terminals are copper and the body is paper insulated.
How fast can I get the Mersen OTS6 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 OTS6 come with a warranty?
Absolutely. The Mersen OTS6 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 OTS6?
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