Bussmann FRS-R-7-1/2 600V RK T...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$75.00
Bussmann FRS-R-7-1/2 600V RK Time-Delay Fuse, 7-1/2A

Bussmann FRS-R-7-1/2 600V RK Time-Delay Fuse, 7-1/2A

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Model: FRS-R-7-1/2

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

$75.00
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Bussmann FRS-R-7-1/2 600V RK Time-Delay Fuse, 7-1/2A

The Bussmann FRS-R-7-1/2 is a 600V Class RK time-delay (TD) fuse designed to provide dependable overcurrent protection for electrical circuits, motors, and equipment. Rated 7-1/2A, this fuse is part of the Bussmann FRS-R series, a line of time-delay fuses built to standard Class RK dimensions and interrupting characteristics. The 600V voltage rating allows this fuse to be applied in higher-voltage branch-circuit and equipment protection schemes commonly found in commercial and industrial facilities. As a time-delay fuse, the FRS-R-7-1/2 is engineered to ride through momentary current surges, such as motor starting inrush, while still opening quickly under sustained overload or short-circuit conditions to help protect wiring, equipment, and personnel. Electrical contractors and maintenance teams rely on fuses like the FRS-R-7-1/2 to maintain code-compliant overcurrent protection in panelboards, disconnects, and control circuits.

Key Features

  • Voltage Rating: Rated for use on systems up to 600V, giving installers flexibility across a range of commercial and industrial voltage applications.
  • Fuse Class: Manufactured to Class RK specifications, meaning the fuse is sized to fit rejection-style fuse holders, a design feature intended to help prevent the installation of a replacement fuse with an inadequate voltage or interrupting rating.
  • Time-Delay (TD) Operation: The time-delay design allows the fuse to withstand temporary overload conditions, such as motor starting current, without opening, while still responding quickly to sustained overloads and short circuits.
  • Amperage Rating: Sized at 7-1/2A, the FRS-R-7-1/2 is intended for circuits and equipment with a corresponding current draw, helping match protection to the specific load.
  • Model Series: Part of the Bussmann FRS-R fuse series, offering a consistent design platform across multiple ampere ratings for standardized circuit protection.

Technical Specifications

  • Voltage Rating: 600V
  • Amperage Rating: 7-1/2A
  • Fuse Class: RK
  • Fuse Type: Time-Delay (TD)
  • Series: FRS-R

Typical Applications

  • Motor Circuit Overcurrent Protection
  • Commercial and Industrial Electrical Panels
  • Branch-Circuit Protection
  • Control Circuit and Equipment Protection
  • Panelboard and Disconnect Switch Fusing

Why Bussmann?

The Bussmann FRS-R-7-1/2 fuse reflects Bussmann's focus on precise, time-delayed overcurrent protection for demanding electrical systems. With a 600V rating and Class RK design, this fuse is built to help maintain safe, code-compliant operation in commercial and industrial power distribution equipment. Choose Bussmann for consistent, dependable overcurrent protection backed by a recognized name in circuit protection.

Manufacturer Resources

Product Specs

list_batch:
BUSS-20260919
Product Type:
Time-Delay Fuse
Voltage Rating:
600V
Amperage Rating:
7-1/2A
Series:
FRS-R
Department:
Electrical
Product Subgroup:
Fuses
Product Group:
Circuit Protection

Bussmann FRS-R-7-1/2 – Frequently Asked Questions

1) Will a Bussmann FRS-R-7-1/2 fit a rejection-style 600V fuse clip?
Yes. The FRS-R-7-1/2 is built to Class RK dimensions, which is the rejection-style form factor, so it seats in holders and clips prepped to reject lower-rated fuses. That rejection feature exists to stop someone dropping in a replacement with an inadequate voltage or interrupting rating. It is a 600V fuse, so it goes in 600V class R hardware, not 250V clips.
2) Can I use a 600V fuse like the FRS-R-7-1/2 on a 240V or 480V circuit?
Yes. A fuse voltage rating is a maximum, not a target, so the 600V FRS-R-7-1/2 can be applied on any system at or below 600V, including 208V, 240V and 480V equipment. What you cannot do is go the other way and put a 250V fuse in a 600V disconnect.
3) Why pick a time-delay fuse instead of a fast-acting one for a motor circuit?
Motor starting inrush will blow a fast-acting fuse sized close to the running load. The FRS-R-7-1/2 is a time-delay (TD) design, so it rides through that momentary surge and still opens on a sustained overload or short circuit. Use fast-acting fuses where there is no inrush, such as resistive loads or protecting solid-state devices.
4) Is the Bussmann FRS-R-7-1/2 a 7.5 amp fuse?
Yes, same thing. The catalogue designation writes the rating as 7-1/2A, which is 7.5 amps. The part number is FRS-R-7-1/2, and that fraction in the number is the ampere rating, not a dimension.
5) Can I substitute a higher amp fuse if 7-1/2A keeps opening?
No. Going up in amperage defeats the protection the circuit was designed around and leaves wiring and equipment unprotected. Repeated opening of a 7-1/2A time-delay fuse points at an overloaded or failing load, not an undersized fuse. Replace like for like with another FRS-R at 7-1/2A and chase the fault.
6) Where in a panel does an FRS-R series fuse normally get installed?
Typical placement is in fused disconnect switches, panelboards, motor branch circuits and control circuit protection in commercial and industrial distribution gear. For MRO teams it is a stocking item because the FRS-R series runs across many ampere ratings on one design platform, so a shelf of FRS-R fuses covers a whole facility's class R sockets.
How fast can I get the Bussmann FRS-R-7-1/2 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 Bussmann FRS-R-7-1/2 come with a warranty?
Absolutely. The Bussmann FRS-R-7-1/2 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 Bussmann FRS-R-7-1/2?
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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