Technical Specifications

Key Features

Applications

• Industrial control transformer protection
• Industrial control panels requiring Class CC fuses
• Compatible 600 VAC branch-circuit protection
• Industrial electrical line protection
• Control circuits with temporary transformer inrush currents
• Industrial machinery control equipment
• Compatible Class CC DIN-rail fuse holders and fuse blocks
• Exact-model industrial equipment fuse replacement

Purchase Information

We support online purchase of the Bussmann FNQ-R-25 Class CC Time-Delay Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.

Frequently Asked Questions

What is the Bussmann FNQ-R-25?
It is a 25 A, 600 VAC Class CC current-limiting time-delay cartridge fuse from the Eaton Bussmann LIMITRON FNQ-R series, designed for compatible industrial control, line protection and branch-circuit applications.

Who manufactures FNQ-R-25?
FNQ-R-25 belongs to the Eaton Bussmann fuse range. Its manufacturer catalog number is FNQ-R-25.

What is the current rating?
The rated current is 25 amperes, equivalent to 25,000 milliamperes.

What is the AC voltage rating?
The published AC voltage rating is 600 VAC. The operating circuit voltage must remain within the fuse's applicable electrical rating.

Is FNQ-R-25 rated for DC applications?
Eaton FNQ-R Technical Data 1014 specifies a 300 VDC rating for the 15 A and 20 A models only. It does not establish a DC rating for FNQ-R-25. Do not assume that the AC interrupting rating applies to DC circuits. Verify any proposed DC application against current manufacturer documentation.

Is FNQ-R-25 a time-delay fuse?
Yes. Eaton identifies FNQ-R-25 as a high-inrush time-delay fuse. Its product specification lists a response time of 12 seconds at 200% of rated current. Actual opening time depends on applied overcurrent and operating conditions.

What is the interrupting rating?
Eaton specifies a 200 kA RMS symmetrical AC interrupting rating at 600 VAC, equivalent to 200,000 amperes.

What are the physical dimensions?
The nominal dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 inch by 1.50 inches.

Does FNQ-R-25 have a blown-fuse indicator?
No. Eaton identifies FNQ-R-25 as a non-indicating cartridge fuse without a built-in visual blown-fuse indicator.

What materials and terminal configuration does FNQ-R-25 use?
Eaton specifies a melamine tube body and ferrule-to-ferrule connections. FNQ-R series documentation also describes nickel-plated brass end caps and dual-element current-limiting construction.

Can FNQ-R-25 replace FNQ-25?
Do not assume direct interchangeability. FNQ-R-25 is a 600 VAC Class CC branch-circuit fuse with a 200 kA AC interrupting rating, while FNQ-25 is a 500 VAC supplemental fuse with a 10 kA AC interrupting rating. Their protection classifications, rejection features and application requirements differ.

Is FNQ-R-25 RoHS compliant?
Eaton's FNQ-R-25 product specification identifies the model as RoHS compliant and CE marked. Confirm any additional application-specific compliance documentation before installation.

What should be verified before ordering?
Confirm the exact FNQ-R-25 catalog number, 25 A current rating, 600 VAC voltage rating, 200 kA AC interrupting capacity, time-delay characteristics, Class CC fuse-holder compatibility and circuit protection requirements. Consult Eaton Bussmann FNQ-R Technical Data 1014 for additional application guidance.