Mersen Amp-Trap® HSJ Class J H...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$71.51
Mersen Amp-Trap® HSJ Class J High-Speed Fuse, 600VAC/500VDC, 200A

Mersen Amp-Trap® HSJ Class J High-Speed Fuse, 600VAC/500VDC, 200A

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Model: HSJ10

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

$71.51
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Mersen Amp-Trap® HSJ Class J High-Speed Fuse, 600VAC/500VDC, 200A

The Mersen Amp-Trap® HSJ is a High-Speed Class J fuse engineered to combine the low I2t characteristics of a semiconductor fuse with the branch-circuit performance of a UL Listed Class J fuse in a single device. Rated 600VAC and 500VDC with a 200A Amp-Trap® rating and a 200 kA AC interrupting capacity, the HSJ delivers NEC-compliant branch-circuit protection while also safeguarding sensitive power semiconductors such as Diodes, SCRs, GTOs, and SSRs. This fuse is offered with a choice of terminal configuration — Blade or Ferrule — so it can be matched to the fuse holder or block used in a given installation, giving engineers and panel builders flexibility across demanding industrial power electronics and drive applications where both circuit and component protection are required.

Key Features

  • High-Speed Class J Design: Combines the low I2t of a semiconductor fuse with the branch-circuit performance of a UL Listed Class J fuse for dual-purpose protection.
  • Dual AC/DC Rating: Rated 600VAC and 500VDC, giving the HSJ flexibility across both AC and DC power distribution and semiconductor protection applications.
  • 200A Amp-Trap® Rating: Delivers precise, high-speed current-limiting protection at the 200A level for power semiconductor and branch-circuit applications.
  • High Interrupting Capacity: AC maximum interrupting/breaking capacity (I1) of 200 kA for reliable performance under high fault-current conditions.
  • Selectable Terminal Connection: Available in Blade or Ferrule terminations to fit standard Class J fuse holders and blocks — select the connection type that matches your equipment.
  • 50/60 Hz Frequency Rating: Suitable for standard AC power frequencies used across North American and international electrical systems.
  • GMG Body/Insulating Material: Constructed with GMG insulating material for durable, reliable performance in demanding electrical environments.
  • RoHS Compliant Construction: Meets RoHS compliance requirements for restricted hazardous substances.

Certifications & Compliance

  • UL Listed Class J Fuse (Rated Voltage AC/DC per UL)
  • RoHS Compliant

Technical Specifications

  • ROHS Compliant: Yes
  • Body/Insulating Material: GMG
  • Connection Type Options: Blade, Ferrule
  • AC Max I.R./Breaking Capacity (I1): 200 kA
  • Frequency: 50/60 Hz
  • Rated Voltage AC (UL): 600 V
  • Rated Voltage DC (UL): 500 V
  • Speed/Characteristic: High Speed
  • AC or DC: AC/DC
  • Fuse Class: Class J
  • Packaging: 1 EA

Typical Applications

  • Power Semiconductor Protection (Diodes, SCRs, GTOs, SSRs)
  • NEC Branch-Circuit Protection
  • Industrial Motor Drives and Power Electronics
  • Panelboard and Switchgear Fuse Protection
  • Commercial and Industrial Electrical Systems

Why Mersen?

Mersen's Amp-Trap® HSJ Class J High-Speed fuse is engineered to meet UL Listed Class J requirements while delivering the low I2t performance semiconductor devices demand. With a GMG insulating body, a 200 kA interrupting rating, a choice of Blade or Ferrule terminations, and RoHS-compliant construction, the HSJ provides dependable, code-compliant protection for professional electrical and industrial power applications.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Mounting Method:
Clip
AC Max I.R./Breaking Capacity: I1:
200 kA
ROHS Compliant:
Yes
Frequency (Hz):
50/60 Hz
Rated voltage AC UL:
600 V
Speed/Characteristic:
High Speed
AC or DC:
AC/DC
Rated voltage DC UL:
500 V
Fuse Class:
Class J
Body/Insulating Material:
GMG
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Semiconductor Fuse
Product Material:
GMG
Voltage Rating:
600V
Amperage Rating:
200A
Listing:
UL Listed
Standards:
RoHS
Product Subgroup:
Fuses

Mersen HSJ10 – Frequently Asked Questions

1) Does the Mersen HSJ 200A Class J fuse come with blade or ferrule terminals?
Both terminal styles are offered at 200A. The ferrule version is MPN HSJ10 and the blade version is HSJ200. Pick the one that matches the clips in your existing Class J holder or fuse block, since the two are not interchangeable in the same mounting.
2) Can I use the Mersen Amp-Trap HSJ fuse on a 500VDC drive circuit?
Yes. The HSJ carries a UL rated voltage of 600VAC and 500VDC, so it can be applied on either AC or DC circuits up to those limits. At 200A it is used for DC link and semiconductor protection in drives as well as AC branch circuits.
3) Will a high-speed Class J fuse still satisfy NEC branch-circuit protection, or do I need a separate standard Class J?
One fuse covers both. The HSJ is a UL Listed Class J fuse, so it qualifies as branch-circuit protection, while its high-speed, low I2t characteristic also protects power semiconductors like diodes, SCRs, GTOs and SSRs. That is the reason it exists: you avoid stacking a semiconductor fuse behind a standard branch-circuit fuse.
4) Will a Mersen HSJ fuse fit in a standard Class J fuse block?
Yes, within the limits of the class. Class J fuses are dimensionally standardized and the HSJ is a clip-mounted Class J, so it drops into Class J holders and blocks rated for the amperage. Just match the terminal style, blade or ferrule, to the block you have.
5) What should I use instead of the Mersen HSJ for protecting a low-current control or electronics circuit?
The Mersen Amp-Trap HSJ is built for 200A branch circuits and power semiconductor protection at 600VAC/500VDC, which is far above a control or electronics load. For small loads, the Littelfuse BLF series is a midget fast-acting fuse rated 250V in a laminated tube, and the Littelfuse AGA5 is a 5A glass fuse in the AGA series. Both are physically small cartridge styles suited to low-current circuits rather than to the Class J clip mounting the HSJ requires.
6) My drive needs both DC protection and a UL branch-circuit fuse. Do any of the alternatives cover that?
The Mersen Amp-Trap HSJ is rated for both AC and DC service at 600VAC and 500VDC and carries a high-speed characteristic, so one UL Listed Class J device covers branch-circuit duty and semiconductor protection. The comparable cartridge fuses are described by different duties: the Littelfuse CCMR040 is a Class CC time-delay fuse and the Littelfuse BLF is a midget fast-acting fuse rated 250V. For a 500VDC drive bus the HSJ's AC/DC rating is the one to match.
7) What fault current can the Mersen HSJ 200A fuse interrupt?
AC maximum interrupting/breaking capacity is 200 kA, which covers service and panelboard locations with high available fault current. It is rated for 50/60 Hz systems.
8) Can I replace a standard Class J fuse with the HSJ high-speed version in the same holder?
Electrically it is the same class, voltage and amperage slot, so a 200A HSJ goes where a 200A 600V Class J went. The difference is timing: the HSJ clears faster with lower I2t, so it protects semiconductors but may not ride through inrush the way a time-delay style Class J does. On motor or transformer loads with heavy inrush, check the duty before swapping.
9) What is the difference between this Class J fuse and a Class CC fuse like the Littelfuse CCMR?
Different physical class and a very different amperage range. The Mersen HSJ is a 200A Class J, 600VAC/500VDC, for branch circuits and semiconductor protection. The Littelfuse CCMR040 is a Class CC time-delay fuse at 40A, a small midget-size fuse used for control circuits and small motor loads. They are not dimensionally interchangeable, and a Class CC holder will not take a Class J fuse.
10) Is a Littelfuse AGU glass tube fuse an equivalent to the Mersen HSJ Class J fuse?
No. The Littelfuse AGU is an AG-series glass tube fuse supplied in a boxed package, a small cartridge style used for low-current circuits. The Mersen Amp-Trap HSJ is a UL Listed Class J high-speed fuse rated 600VAC and 500VDC at 200A with a 200 kA AC interrupting capacity, mounted in Class J clips. The two differ in class, size, and interrupting capability and are not interchangeable.
11) I need fuses for a metering circuit, not a 200A feeder. What is the alternative to the Mersen HSJ?
For instrument and metering taps, the Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses intended for meter inputs. The Mersen Amp-Trap HSJ is a 200A Class J branch-circuit and power semiconductor fuse at 600VAC/500VDC, so it is sized for the feeder or drive input rather than the metering leads. Both share a 600V class of application, but the amperage and fuse class are different.
12) Is the Mersen HSJ fuse RoHS compliant for export builds?
Yes, the HSJ is built to RoHS compliance requirements. The body and insulating material is GMG.
13) How many fuses come in a pack of the Mersen HSJ?
The HSJ is packaged individually, 1 EA. Three-phase panels need three per circuit, so order by the pole count of the gear.
How fast can I get the Mersen HSJ10 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 HSJ10 come with a warranty?
Absolutely. The Mersen HSJ10 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 HSJ10?
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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