Frequently Asked Questions
What is the Bussmann FNQ-R-15?
It is a 15 A Class CC current-limiting time-delay cartridge fuse from the Eaton Bussmann LIMITRON FNQ-R series. The model is rated for 600 VAC and 300 VDC and is intended for compatible industrial control, line protection and branch-circuit applications.
Who manufactures FNQ-R-15?
FNQ-R-15 belongs to the Eaton Bussmann product range. Its manufacturer catalog number is FNQ-R-15.
What is the current rating?
The rated current is 15 amperes, equivalent to 15,000 milliamperes.
Can FNQ-R-15 be used in both AC and DC circuits?
Yes. Eaton specifies a maximum voltage rating of 600 VAC and 300 VDC for FNQ-R-15. Circuit voltage, available fault current, fuse-holder compatibility and the applicable protection requirements must all be checked before use.
What are the AC and DC interrupting ratings?
The AC interrupting rating is 200 kA RMS symmetrical at 600 VAC. The DC interrupting rating is 20 kA at 300 VDC. These are separate ratings and must not be interchanged.
Is FNQ-R-15 a time-delay fuse?
Yes. Eaton identifies FNQ-R-15 as a dual-element, current-limiting time-delay fuse. Its product specification lists a response time of 12 seconds at 200% of rated current. Actual opening behavior depends on the applied overcurrent and operating conditions.
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-15 have a blown-fuse indicator?
No. FNQ-R-15 is a non-indicating cartridge fuse without a built-in visual blown-fuse indicator.
What materials and terminal configuration does FNQ-R-15 use?
Eaton specifies a melamine tube body with ferrule-to-ferrule connections. FNQ-R series product information also describes nickel-plated brass end caps and rejection-style Class CC construction.
Can FNQ-R-15 replace FNQ-15?
Do not assume interchangeability based only on current rating or physical dimensions. FNQ-R-15 is a Class CC branch-circuit fuse rated for 600 VAC and 300 VDC, while the FNQ supplemental fuse series has different electrical and protection characteristics. Verify the exact catalog designation, fuse class, holder compatibility and manufacturer time-current curves before replacement.
Is FNQ-R-15 RoHS compliant?
Yes. Eaton identifies FNQ-R-15 as RoHS compliant and CE marked. Eaton FNQ-R Technical Data 1014 specifies FNQ-R-1/4 as the exception to the series RoHS statement, not FNQ-R-15.
What should be verified before ordering?
Confirm the exact FNQ-R-15 catalog number, 15 A current rating, 600 VAC or 300 VDC circuit requirement, 200 kA AC or 20 kA DC interrupting rating, time-delay characteristics, Class CC fuse-holder compatibility and applicable circuit protection requirements. Refer to Eaton Bussmann FNQ-R Technical Data 1014 for detailed application guidance.