FNQ-20

Applications:	Electrical, Industrial
Size / Dimension:	0.406" Dia x 1.500" L (10.30mm x 38.10mm)
Package / Case:	5AG, 10mm x 38.1mm
Mounting Type:	Holder
Breaking Capacity @ Rated Voltage:	10kA
Operating Temperature:	--
Approvals:	CE, CSA, UL
Class:	--
Features:	--
Series:	FNQ
Response Time:	Slow
Voltage Rating - AC:	500V
Current Rating:	20A
Fuse Type:	Cartridge
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

FNQ-20 application field and working principle is an important topic in Electrical, Specialty Fuses. FNQ-20 is a Class G fuse, or a slow blow fuse, designed for applications where precise current-limiting is required to protect sensitive electronic components from line surges. The FNQ-20 fuses are available in both axial lead and cartridge styles. This article will explain the general application field and working principle of FNQ-20, and the advantages and disadvantages of using them.

Application Field of FNQ-20

FNQ-20 is an ideal choice for applications where high inrush currents are expected, or may occur, such as in motor circuits, air conditioners, ice makers, lighting circuits, solar power systems, and photovoltaic applications. The FNQ-20 fuses are UL Recognized and CSA Listed at 1,800 amperes interrupting for use on circuits up to 600 volts ac, and 1,200 volts dc. It can be used in a wide variety of applications including industrial, residential, and commercial buildings, and when properly installed, provides comprehensive over-current protection.

FNQ-20 Working Principle

The working principle of FNQ-20 fuses is that it uses the Joule heating effect to automatically open the circuit when the current exceeds the fuse rating. When the current going through the fuse reaches the rated value, the fuse heats up, and its temperature rises sufficiently to melt the solder tool inside, which opens the circuit. The FNQ-20 fuse is designed to open the circuit slowly enough so that it limits the excess current to a safe level. This ensures that equipment is not damaged due to sudden openings of the circuit.

Advantages and Disadvantages

The advantages of using FNQ-20 are that it is constructed to handle high inrush currents which can damage sensitive electronic components, it is UL Recognized and CSA Listed, and it provides excellent current limiting protection. Another advantage is that the FNQ-20 is constructed so that its time-delay characteristics are not affected by applied voltage or temperatures, so it performs consistently even in extreme conditions. The disadvantages are that it is more expensive than other types of fuses, and it is not suitable for applications requiring fast-acting protection.

Conclusion

FNQ-20 is an ideal choice for applications where fast-acting protection or current limiting is needed. It is UL Recognized and CSA Listed, and provides comprehensive over-current protection. The advantages include the ability to handle high inrush currents, excellent current limiting protection, and consistent time-delay characteristics in extreme conditions, while the disadvantages are the higher cost and the fact that it is not suitable for fast-acting protection.

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