Mersen BHH Series Medium Volta...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,226.09
Mersen BHH Series Medium Voltage Potential Transformer Fuse, Ferrule Type

Mersen BHH Series Medium Voltage Potential Transformer Fuse, Ferrule Type

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Model: 9F60BHH905

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

$1,226.09
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Mersen BHH Series Medium Voltage Potential Transformer Fuse, Ferrule Type

The Mersen BHH Series Medium Voltage Potential Transformer Fuse is a current-limiting, ferrule-type fuse engineered for primary winding protection of potential transformers in medium voltage systems. This compact, small-dimension fuse mounts in standard clips, carries a rated voltage of 15500VAC UL, an AC interrupting rating of 120 kA, and is available across a current rating range of 0.25A to 10A to match a variety of transformer protection needs. Copper terminals, an epoxy insulating body, and a built-in visual indicator combine to deliver reliable, easy-to-verify protection for medium voltage electrical systems.

Key Features

  • Ferrule Terminal Design: ferrule-type construction with small overall dimensions mounts in standard clips for straightforward installation and replacement.
  • Current-Limiting Protection: high AC interrupting rating (maximum breaking capacity) of 120 kA safeguards potential transformer primary windings from fault currents.
  • Rated Voltage: 15500VAC (rated voltage AC UL) supports demanding medium voltage system applications.
  • Current Rating Range: available from 0.25A to 10A, allowing selection of the exact ampere rating needed for a given transformer protection scheme.
  • Copper Terminals: connection and terminal material of copper delivers reliable, low-resistance conductivity at the clip interface.
  • Epoxy Body Construction: body and insulating material is epoxy, providing durable, long-lasting insulation performance in service.
  • Visual Indicator: built-in visual indication system allows maintenance personnel to quickly confirm fuse status without de-energizing equipment.
  • AC Rated: designed for AC circuits operating at a frequency of 50/60 Hz.
  • Clip Mounting: mounts directly in standard fuse clips, simplifying integration into existing potential transformer protection assemblies.

Technical Specifications

  • AC or DC: AC
  • Indication System: Yes

Typical Applications

  • Potential Transformer Primary Winding Protection
  • Medium Voltage Switchgear and Substations
  • Utility and Industrial Power Distribution Systems
  • Metering and Instrumentation Circuits
  • Panelboard and Switchgear Retrofit or New Construction Projects

Why Mersen?

Mersen's BHH Series fuses pair current-limiting performance with a compact ferrule design, copper terminals, and an epoxy insulating body to deliver dependable, code-compliant primary-side protection for potential transformers across a broad 0.25A to 10A current range. The built-in visual indicator adds an extra layer of confidence for maintenance teams working in demanding 15500VAC medium voltage environments, helping ensure protection status can be verified quickly and safely.

Manufacturer Resources

Mersen Product Catalog

Product Specs

list_batch:
MERSEN-20260825
Product Type:
Fuse
Product Material:
Epoxy
Connection Type:
Ferrule
Voltage Rating:
15500V
Amperage Rating:
0.25A - 10A
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Mersen 9F60BHH905 – Frequently Asked Questions

1) What is the Mersen BHH Series fuse actually used for?
The Mersen BHH Series is a current-limiting ferrule fuse for protecting the primary winding of potential transformers in medium voltage systems. Typical spots are medium voltage switchgear and substations, metering and instrumentation circuits, and utility or industrial distribution. It is not a load-protection fuse for feeders or motors, it sits on the PT primary.
2) Will a BHH ferrule fuse drop into my existing fuse clips?
It is built to mount directly in standard fuse clips. The ferrule terminals are copper and the overall dimensions are small, which is why it suits existing PT protection assemblies and switchgear retrofits as well as new construction. No end-fitting adapters or bolted lugs are involved, the clip grips the ferrules.
3) Can I substitute a Littelfuse or Square D fuse for a Mersen BHH potential transformer fuse?
No. The BHH is a 15500VAC medium voltage PT fuse. The low voltage parts are not interchangeable with it: the Littelfuse BLF Series is a 250V midget fast-acting fuse, the Littelfuse CCMR040 is a 40A Class CC time-delay fuse, and the Square D PowerLogic meter fuse pack is 0.5A 600V. Those protect control, meter, and branch circuits at utilization voltage. Nothing below 600V belongs on a medium voltage PT primary.
4) Can a Littelfuse CCMR Class CC time-delay fuse be used in place of a Mersen BHH potential transformer fuse?
No. The Mersen BHH Series is a ferrule-type fuse rated 15500VAC for primary winding protection of potential transformers in medium voltage systems. The Littelfuse CCMR040 is a Class CC time-delay fuse in the CCMR series, a low voltage branch-circuit and motor-circuit fuse with a rejection-style body. The two are built for different voltage classes and different mounting, so the CCMR is not a replacement for a medium voltage PT fuse.
5) What is the difference between the Mersen BHH ferrule fuse and a Littelfuse midget fuse like the BLF?
Both are small-dimension cylindrical fuses that mount in clips, which is why they can look interchangeable on a shelf. The Mersen BHH Series carries a 15500VAC rating with copper terminals and an epoxy insulating body for potential transformer primary protection. The Littelfuse BLF Series is a midget fast-acting fuse rated 250V with a laminated tube body. Size similarity does not carry the voltage rating across, so the BLF serves low voltage control and branch applications instead.
6) What ampere ratings does the Mersen BHH potential transformer fuse come in?
The BHH Series spans 0.25A to 10A, so you can match the fuse to the PT burden rather than oversizing. Model 9F60BHH905 is one of the ferrule-type units in that family. Pick the ampere rating from your PT protection scheme, PT primaries draw very little current, which is why the range starts at a quarter of an amp.
7) How do I tell if a BHH fuse has blown without shutting the gear down?
The BHH has a built-in visual indicator, so maintenance staff can confirm fuse status by sight instead of de-energizing the equipment to test it. That matters in substation and switchgear cabinets where an outage to check a PT fuse is expensive.
8) For a low voltage metering circuit, is there a simpler fuse than the Mersen BHH?
Yes. The Mersen BHH Series is intended for metering and instrumentation circuits on the medium voltage side, where it protects the potential transformer primary at 15500VAC. If the fuse sits on the secondary or on a low voltage meter, the Square D PowerLogic Energy Meter Fuse Pack supplies 0.5A 600V fuses in a set of three, sized for metering duty at 600V rather than medium voltage switchgear.
9) Are Littelfuse AGA or AGU glass tube fuses equivalent to the Mersen BHH Series?
No. The Littelfuse AGA Series, such as the AGA5 at 5A, and the AGU Series are glass tube automotive-style fuses. The Mersen BHH Series is a current-limiting medium voltage fuse rated 15500VAC with copper terminals and an epoxy body, covering 0.25A to 10A for transformer primary protection. The amperage ranges overlap, but the construction and voltage class do not, so a glass tube fuse is not a substitute.
10) What is the BHH fuse body made of, and does it hold up in a substation?
The body and insulating material is epoxy, with copper ferrule terminals at each end. Epoxy gives a rigid, non-porous insulating barrel for medium voltage service, and the copper terminals keep resistance low at the clip interface.
11) Does the BHH fuse work on DC circuits?
No, it is an AC-only device intended for 50/60 Hz systems. For a DC application you need a fuse specifically DC rated at the system voltage, as a DC arc behaves differently from an AC arc that self-extinguishes at current zero.
How fast can I get the Mersen 9F60BHH905 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 9F60BHH905 come with a warranty?
Absolutely. The Mersen 9F60BHH905 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 9F60BHH905?
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
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