Mersen ACK Series Forklift Tru...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$152.77
Mersen ACK Series Forklift Truck Time Delay Fuse, Blade Terminal, 125VAC/125VDC

Mersen ACK Series Forklift Truck Time Delay Fuse, Blade Terminal, 125VAC/125VDC

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Model: MERACK-100

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

$152.77
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Mersen ACK Series Forklift Truck Time Delay Fuse, Blade Terminal, 125VAC/125VDC

The Mersen ACK Series is a forklift truck and battery isolator fuse family built for the heavy duty loads associated with DC battery powered equipment such as forklift trucks, hand trucks, motorized work platforms, and other DC battery operated systems. This Time Delay fuse line is offered across a Motor FLA range of 100A to 250A, allowing you to match protection to the specific inrush and running current demands of your equipment while sharing the same rugged construction across every option. Featuring a bolted, stud-mounted blade terminal design with copper connection material and a rugged PolyTube insulating body, the ACK Series is rated 125V AC/DC UL with a 10 kA AC Max I.R./Breaking Capacity at 50/60 Hz, giving it the reliability to protect demanding heavy duty circuits up to 125V AC or DC regardless of which Motor FLA rating is selected.

Key Features

  • Motor FLA Range: Available in Motor FLA ratings from 100A to 250A, so the correct fuse can be matched to the connected motor or battery load.
  • Blade Terminal, Bolted Mounting: Stud-mounted, bolt-in blade connection/terminal type for a secure, long-lasting fit in adverse operating conditions across every Motor FLA option.
  • Copper Terminal Construction: Connection/terminal material is copper, supporting reliable, low-resistance electrical connections at every amperage in the range.
  • Time Delay Characteristic: Time Delay speed/characteristic is matched to the inrush demands of heavy duty DC battery powered equipment, common to all Motor FLA options.
  • Dual AC/DC Voltage Rating: Rated voltage AC UL of 125V and rated voltage DC UL of 125V allows use on AC/DC circuits up to 125V, a constant specification across the entire ACK Series family.
  • High Breaking Capacity: AC Max I.R./Breaking Capacity (I1) of 10 kA at a rated frequency of 50/60 Hz for dependable interruption performance regardless of the Motor FLA rating chosen.
  • Durable PolyTube Body: Body/insulating material is PolyTube, contributing to the rugged construction needed for a long service life in demanding forklift and battery-powered equipment environments.

Technical Specifications

  • Rated voltage AC UL: 125 V
  • Rated voltage DC UL: 125 V
  • Motor FLA Options: 100A, 250A

Typical Applications

  • Forklift Trucks and Hand Trucks
  • Motorized Work Platforms
  • DC Battery Powered Equipment and Systems
  • Heavy Duty Industrial Material Handling Equipment
  • Battery Isolation Circuit Protection up to 125V AC or DC

Why Mersen?

Mersen forklift truck and battery isolator fuses combine rugged, stud-mounted bolt-in blade construction with copper terminals and a durable PolyTube body to withstand the adverse conditions common to DC battery powered equipment, no matter which Motor FLA rating in the 100A-250A range is selected. With a dual 125V AC/DC UL voltage rating and a 10 kA AC breaking capacity shared across the ACK Series, these Time Delay fuses are engineered to deliver dependable, code-compliant circuit protection for heavy duty forklift and battery-powered applications.

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Manufacturer Resources

Mersen Product Catalog

Product Specs

Connection Terminal Type:
Blade
Mounting Method:
Bolted
Connection/Terminal Material:
Copper
AC Max I.R./Breaking Capacity: I1:
10 kA
Frequency (Hz):
50/60 Hz
Rated voltage AC UL:
125 V
Speed/Characteristic:
Time Delay
AC or DC:
AC/DC
Rated voltage DC UL:
125 V
Body/Insulating Material:
PolyTube
list_batch:
MERSEN-20260825
Product Type:
Time-Delay Fuse
Department:
Electrical
Product Group:
Circuit Protection
Connection Type:
Blade Terminal
Voltage Rating:
125V AC/DC
Amperage Rating:
100A - 250A
Product Material:
PolyTube
Product Subgroup:
Fuses

Mersen MERACK-100 – Frequently Asked Questions

1) Can the Mersen ACK forklift fuse be used on a 36V or 48V DC battery truck?
Yes. The ACK Series is rated 125V DC UL and 125V AC UL, so any DC battery system at or below 125V, including 24V, 36V, 48V and 80V forklift packs, is within its voltage rating. It is specifically a forklift truck and battery isolator fuse for DC battery powered equipment.
2) Which Mersen ACK fuse do I order, ACK-100 or ACK-250?
Pick by the motor full load amps of the equipment. ACK-100 covers a 100A Motor FLA and ACK-250 covers 250A, the two ends of the series' 100A to 250A range. Match the rating to the connected motor or battery load, not to the peak inrush, since the Time Delay characteristic is what rides through the starting surge.
3) How does the Mersen ACK fuse mount? Is it a clip-in cartridge?
No clips. It is a bolted, stud-mounted blade terminal fuse, so it bolts down at each end rather than dropping into fuse clips. The terminals are copper for a low resistance joint, which matters on the high continuous currents a battery isolator circuit sees. You need a bolt-down fuse base or busbar landing, not a cartridge holder.
4) Is a Littelfuse CCMR040 Class CC time-delay fuse an acceptable swap for a Mersen ACK-100 forklift fuse?
No. Both are time-delay fuses, but they are built for different circuits. The Mersen ACK series is a forklift truck and battery isolator fuse with a bolted, stud-mounted blade terminal and copper connections, rated 125V AC and 125V DC with a 10 kA AC breaking capacity, and the ACK-100 covers a 100A motor FLA. The Littelfuse CCMR040 is a Class CC time-delay fuse at 40A, a ferrule-style midget-class fuse that drops into a Class CC fuse holder rather than bolting across battery studs. Use the ACK where the fuse bolts into a DC battery circuit on material handling equipment, and the CCMR where a Class CC holder is already installed.
5) Why use a time delay fuse on a lift truck instead of a fast-acting one?
Traction and hydraulic motors on battery trucks draw a heavy inrush every time they start. The ACK Series uses a Time Delay characteristic so it tolerates that surge without nuisance opening, while still clearing a genuine fault. A fast-acting midget fuse such as the Littelfuse BLF Series is built for the opposite job, where you want the quickest possible clearing and there is no motor inrush to ride out.
6) What fault current can the Mersen ACK fuse interrupt?
10 kA AC maximum interrupting rating at 50/60 Hz. That is the figure to check against the available fault current at the point of installation on a 125V AC or DC circuit.
7) Will the ACK fuse body hold up in a dirty, vibrating forklift battery compartment?
The body is PolyTube insulating material rather than glass, and the whole assembly bolts down at both terminals, which is what keeps it in place under vibration. That construction is the reason this series is specified for forklifts, hand trucks and motorized work platforms instead of a glass tube fuse like the Littelfuse AGU, which is clip held and far more fragile.
8) Can I use a Littelfuse BLF midget fuse instead of a Mersen ACK forklift fuse?
No. The Littelfuse BLF is a 250V midget fast-acting fuse in a laminated tube body, and fast-acting characteristics will open on the inrush that a forklift traction motor or battery circuit draws on startup. The Mersen ACK series is specified as Time Delay for exactly that reason, and it uses a bolted blade terminal with copper connections rather than a clip-held midget tube. Stay with the ACK for forklift, hand truck, and motorized work platform battery circuits.
9) What is the difference between a Mersen ACK fuse and a Littelfuse AGU or AGA glass tube fuse?
Size class and duty. The Littelfuse AGU and AGA series are glass tube fuses, with the AGA5 rated 5A, used for low-current accessory and control circuits. The Mersen ACK series covers a 100A to 250A motor FLA range in a rugged PolyTube insulating body with bolted copper blade terminals and a 10 kA AC breaking capacity, intended for the main battery and traction circuits on DC powered material handling equipment. They are not interchangeable in either direction.
10) My metering circuit needs fuse protection, not my forklift. Is the Mersen ACK the right family?
No. The Mersen ACK series is a forklift truck and battery isolator fuse rated 125V AC/DC with a bolted blade terminal, sized by motor full load amps from 100A to 250A. For instrument and metering circuits, the Square D PowerLogic energy meter fuse pack is the applicable item, supplied as a set of three at 0.5A and 600V for the voltage inputs on a power meter. Choose by circuit: traction and battery loads take the ACK, meter voltage taps take the PowerLogic pack.
11) Is the Mersen ACK fuse suitable for AC equipment as well as DC?
It carries both ratings: 125V AC UL and 125V DC UL, listed as an AC/DC device, with the 10 kA interrupting figure quoted on the AC side at 50/60 Hz. Its intended work is DC battery powered material handling equipment, but it is not DC-only.
How fast can I get the Mersen MERACK-100 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 MERACK-100 come with a warranty?
Absolutely. The Mersen MERACK-100 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 MERACK-100?
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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