AP/ETF-1

Package / Case:	Radial, Can, Vertical
DC Cold Resistance:	0.09 Ohms
Size / Dimension:	0.329" Dia x 0.303" H (8.35mm x 7.70mm)
Color:	--
Operating Temperature:	-55°C ~ 125°C
Approvals:	SEMKO, UL
Melting I²t:	5.9
Breaking Capacity @ Rated Voltage:	100A
Mounting Type:	Through Hole
Series:	ETF
Response Time:	Slow
Voltage Rating - AC:	277V
Current Rating:	1A
Fuse Type:	Board Mount (Cartridge Style Excluded)
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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AP/ETF-1 Application Field and Working Principle.AP/ETF-1 fuses are widely used in protection of medium-voltage circuits during transmission, distribution and further transformation. These fuse links are designed in compliance with IEC standard 60044-2 and have a good performance when used in normal operations of circuit protection. FTA fuses, or fuse adaptors, are utilized to connect AP/ETF-1 fuses in grid areas, allowing for increased flexibility and simplicity of installation and maintenance. This article will discuss the application fields of AP/ETF-1 fuses and will explain the working principle of such fuse links.AP/ETF-1 fuses are designed for general protection of medium-voltage and low-voltage networks. These fuse links are most commonly used in circumstances where overloading, short-circuit and grounding problems are expected to occur. Voltage classes of up to 36kV can be protected by AP/ETF-1 fuses, providing maximum safety assurance against these types of events. These types of fuse links are also particularly well-suited for high ambient temperatures, making them ideal for use in locations that are considerably hot.AP/ETF-1 fuses consist of a tinned copper conductor which is wound around a glass tube. This tube contains fillers which are designed to expand when subjected to a certain temperature or an electric current. This causes the breakage of the conductor due to oxidative corrosion or dry arc extinction. A thin layer of silver is deposited on the interior of the glass tube in order to increase its electrical arc extinction capabilities.AP/ETF-1 fuses are widely used in the transmission and distribution of electricity. Their robust design and excellent insulation capabilities make them stand out as a reliable choice for medium-to-low voltage circuits. They have been proven effective in preventing high-level arc currents in sensitive circuits due to their distinct design features. Additionally, their flexibility and weight reduction also qualify them as a wise choice for any application where high insulation and lightweight are of value.The working principle of AP/ETF-1 fuses involves fillers which expand when exposed to a certain temperature or electric current, causing the rupture of the conductor which is wound around the glass tube. The glass tube is made from a special type of quartz which is designed to contain the fillers in the normal operating temperature range. As the temperature or current rises beyond the rating of the fuse, fillers expand and the conductor breaks. This breaks the electrical circuit, preventing the further spread of any abnormalities and effectively stopping further damage to the equipment.In conclusion, AP/ETF-1 fuses are designed to provide outstanding performance in medium-to-low voltage applications. They have flexible design features that enable them to cope with different conditions and are proving to be reliable in preventing overloading, short-circuit and grounding problems. The working principle of these fuse links is based on the basic fact that fillers expand when subjected to a certain temperature or an electric current, breaking the conductor and thus preventing further damage. AP/ETF-1 fuses are therefore ideal for providing reliable long-term protection for medium-to-low voltage circuits in any environment.

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