Bussmann FNQ-R-20 20A 600V FNQR20 Time-Delay Fuse Industrial Supplier

Eaton Bussmann FNQ-R-20 20A Class CC Time-Delay Fuse

Buy Eaton Bussmann FNQ-R-20 fuse online.The Eaton Bussmann FNQ-R-20 is a 20 amp, 600Vac and 300Vdc Class CC time-delay current-limiting fuse designed for branch circuits, line protection, small control transformers and industrial control equipment.

Part of the Bussmann series LIMITRON™ FNQ-R family, this dual-element fuse combines high-inrush time-delay performance with rapid current limitation during short-circuit conditions. Its compact Class CC construction provides dependable overcurrent protection for industrial and commercial electrical systems where space, fault-current capability and equipment protection are important.

Key Features

• Catalog Number: FNQ-R-20
• Rated Current: 20 A
• AC Voltage Rating: 600 Vac
• DC Voltage Rating: 300 Vdc
• Fuse Class: Class CC
• Operating Characteristic: Time-delay
• Construction: Dual-element
• Protection Type: Current-limiting
• AC Interrupting Rating: 200 kAIC at 600 Vac
• DC Interrupting Rating: 20 kAIC at 300 Vdc
• Published Response: 12 seconds at 200% rated current
• Rejection Feature: Designed for compatible Class CC fuse holders
• Fuse Indicator: Non-indicating
• Connection: Ferrule end to ferrule end
• Body Material: Melamine tube

Technical Specifications

Typical Applications

• Small control transformer protection
• Industrial control panels
• Branch circuit protection
• Line protection
• Machine control equipment
• Relay and contactor circuits
• Factory automation systems
• Commercial and industrial electrical equipment

Time-Delay Performance for High-Inrush Circuits

Control transformers, relays, contactors and other inductive components can draw temporary inrush current when energized. A fuse without the appropriate time-delay characteristic may open during normal equipment startup.

The FNQ-R-20 is designed to tolerate normal short-duration inrush conditions while maintaining protection against sustained overloads. This operating characteristic makes it suitable for applications that specifically require a 20 amp Class CC time-delay fuse.

Class CC Current-Limiting Protection

During a high-level short-circuit event, the FNQ-R-20 limits the amount of fault current allowed to pass through the circuit. This current-limiting action helps reduce thermal and mechanical stress on conductors, control components and other downstream electrical equipment.

The fuse provides a 200 kA interrupting rating at 600 Vac and a 20 kA interrupting rating at 300 Vdc. System voltage and available fault current must remain within the published ratings.

Rejection-Style Class CC Construction

The FNQ-R-20 incorporates the Class CC rejection feature. When used with an appropriate rejection-style fuse holder, this construction helps prevent the installation of lower-rated supplemental midget fuses that do not provide the same Class CC branch-circuit protection.

The rejection-style fuse is designed to fit compatible Class CC standard and rejection-style holders. The fuse holder must meet the required voltage, current and interrupting-rating requirements.

Compact Fuse Format

Measuring approximately 1.50 inches long and 0.41 inches in diameter, the FNQ-R-20 delivers Class CC branch-circuit protection in a compact cylindrical package. Ferrule terminals at both ends support installation in compatible Class CC fuse blocks and holders.

Physical size alone should not be used to select a replacement fuse. The exact catalog number, current rating, voltage rating, fuse class, response characteristic and interrupting rating must all match the application.

Compatible Fuse Blocks and Holders

The FNQ-R-20 is designed for properly rated Class CC fuse blocks and holders. Compatible Bussmann holder families may include BCM603 modular blocks, CHCC DIN-rail holders, OPM holders, HPS or HPF panel-mount holders, and HEY or HEZ in-line holders.

The exact holder catalog number depends on the pole count, mounting method, terminal configuration and system requirements. Verify the complete holder specification before installation.

Standards and Compliance

• UL Listed to UL 248-4, Class CC
• CSA Certified, Class CC
• CE marked
• RoHS compliant

FNQ-R-20 and FNQ-20 Are Different Fuse Types

The FNQ-R-20 should not be confused with the FNQ-20. The FNQ-R-20 is a 600Vac/300Vdc Class CC current-limiting branch-circuit fuse with a rejection feature. Products from the standard FNQ family have different ratings and supplemental-protection characteristics.

Always verify the complete catalog number printed on the existing fuse or specified in the equipment documentation before ordering a replacement.

Important Selection Information

Before purchasing, confirm the complete manufacturer catalog number FNQ-R-20, the required 20 amp rating, system voltage, available fault current and compatibility with the installed Class CC fuse holder.

Do not select a replacement based only on amperage, appearance or dimensions. Voltage rating, fuse class, time-current characteristic and interrupting rating must also satisfy the equipment and circuit requirements.

Ordering Information

Order using the complete manufacturer part number Eaton Bussmann FNQ-R-20. Confirm the required quantity and all electrical specifications before purchase or installation.