Eaton Bussmann

Bussmann FNQ-4 Time-Delay Midget Fuse 4A 500VAC

SKU: LL1-BSM-FNQ-4*1

$6.98

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Bussmann FNQ-4 Time-Delay Midget Fuse 4A 500VAC

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Eaton Bussmann

Bussmann FNQ-4 Time-Delay Midget Fuse 4A 500VAC

SKU: LL1-BSM-FNQ-4*1

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$6.98

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PRODUCT DOCUMENTATION

Product Information

Technical specifications, features, applications and purchasing information.

Technical Specifications

Brand	Bussmann (Eaton)
Model Number	FNQ-4
Manufacturer Catalog Number	FNQ-4
Product Category	Time-Delay Midget Fuse
Fuse Series	FNQ
Current Rating	4 A
AC Voltage Rating	500 VAC
Operating Characteristic	Time-Delay (Slow-Blow)
Fuse Format	Midget Cartridge Fuse (5AG)
Nominal Dimensions	10.3 x 38.1 mm (13/32 x 1-1/2 in)
Mounting Type	Requires Compatible Fuse Holder
Termination Style	Ferrule End x Ferrule End
Fuse Indication	Non-Indicating
Interrupting Rating at 500 VAC	10 kAIC (10,000 A)
Fuse Body Construction	Fiber Tube (FNQ Series)
End Cap Material	Nickel-Plated Bronze (Eaton Product Specification)
Series End Cap Construction	Nickel-Plated Brass (FNQ Series Literature)
Series Color Code	Orange (500 VAC Maximum)
UPC	051712786041
EAN	5027590060547
Compliance	CE Marked; RoHS Compliant
Protection Type	Supplemental Overcurrent Protection
Manufacturer Reference	Eaton Bussmann FNQ Technical Data 1012

Key Features

4 A Current Rating

Rated at 4 amperes, the FNQ-4 provides supplemental overcurrent protection for appropriately specified industrial electrical control and equipment circuits.

500 VAC Voltage Rating

Designed for compatible AC control circuits operating at or below its published maximum voltage rating of 500 VAC. The FNQ series uses an orange voltage-class color code.

Time-Delay Operation

Helps accommodate temporary inrush currents associated with motor control transformers and other compatible inductive loads, subject to the manufacturer's published time-current characteristics.

10 kA Interrupting Rating

Features an interrupting rating of 10,000 amperes at 500 VAC. The prospective short-circuit current at the installation must not exceed the applicable fuse interrupting capacity.

Compact Midget Fuse Format

Uses a nominal 10.3 mm diameter and 38.1 mm length cylindrical cartridge design for installation in appropriately rated and dimensionally compatible midget fuse holders.

Industrial Cartridge Construction

Combines non-indicating operation with nickel-plated ferrule connections. Eaton's individual FNQ-4 product specification identifies nickel-plated bronze end caps.

Applications

Motor control transformer supplemental protection
Industrial AC control circuits with temporary inrush currents
Compatible control transformer primary circuits
Industrial electrical control panels
Electrical equipment requiring a 4 A time-delay fuse
Compatible lighting and metering control circuits
Compatible DIN-rail midget fuse holders and blocks
Industrial equipment maintenance and specified fuse replacement

Purchase Information

We support online purchase of the Bussmann FNQ-4 Time-Delay Midget 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-4?
It is a 4 A, 500 VAC time-delay midget cartridge fuse from the Eaton Bussmann FNQ series, intended for supplemental overcurrent protection.

Who manufactures FNQ-4?
FNQ-4 is part of the Eaton Bussmann fuse range. Its manufacturer catalog number is FNQ-4.

What is the rated current?
The rated current is 4 amperes, equivalent to 4000 milliamperes.

What is the AC voltage rating?
The published maximum AC voltage rating is 500 VAC. The FNQ series uses an orange voltage-class color code.

Is FNQ-4 a fast-acting fuse?
No. It is a time-delay fuse intended for compatible circuits where temporary inrush currents may occur. Check the manufacturer's time-current characteristics to determine application suitability.

What is the interrupting rating at 500 VAC?
Eaton specifies an interrupting rating of 10 kA at 500 VAC for FNQ-4, equivalent to 10,000 amperes.

What are the physical dimensions?
The nominal dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 13/32 inch by 1-1/2 inches.

Does FNQ-4 have a blown-fuse indicator?
No. The standard FNQ-4 is a non-indicating cartridge fuse.

What materials are used in this fuse?
FNQ series literature identifies fiber tube construction and nickel-plated brass end caps. Eaton's individual FNQ-4 product specification lists nickel-plated bronze end caps. Confirm the precise end-cap alloy with Eaton if material composition is critical.

Can FNQ-4 replace an FNQ-R-4 fuse?
Do not assume the two models are interchangeable. FNQ is a 500 VAC supplemental fuse series, whereas FNQ-R is a 600 VAC Class CC fuse series with different protection classifications, interrupting ratings and installation requirements.

Can FNQ-4 be used for branch-circuit protection?
FNQ-4 is intended for supplemental overcurrent protection. Applications requiring branch-circuit protection must use an appropriately classified protective device with a suitable interrupting rating.

What should be verified before ordering?
Confirm the exact FNQ-4 model number, 4 A current rating, 500 VAC voltage rating, 10 kA interrupting capacity, time-delay characteristics, physical dimensions and fuse-holder compatibility. Consult Eaton Bussmann FNQ Technical Data 1012 for series specifications.

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