SSTC 4

Response Time:	Slow
DC Cold Resistance:	0.023 Ohms
Size / Dimension:	0.330" L x 0.128" W x 0.115" H (8.38mm x 3.25mm x 2.92mm)
Color:	--
Operating Temperature:	-55°C ~ 125°C
Approvals:	--
Melting I²t:	23
Breaking Capacity @ Rated Voltage:	50A
Mounting Type:	Holder, Surface Mount
Package / Case:	2-SMD, Square End Block with Clip
Series:	SSTC
Voltage Rating - DC:	125V
Voltage Rating - AC:	125V
Current Rating:	4A
Fuse Type:	Board Mount (Cartridge Style Excluded)
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Super Short Cycling Time Circuit Fuses

Fuses have been used for over a century in the electrical industry for safety and protection. Today, the technology still plays an important yet lesser-known role in protecting interconnection systems and power system equipment in a wide variety of applications. One such type is the “Super Short Cycling Time Circuit Fuse” (SSTC).SSTC fuses have a very fast cycling time, allowing them to withstand voltage fluctuation without blowing. This makes them ideal for applications such as converters, power supplies, variable-speed motor controllers, UPS systems and more. The fast-acting nature means they also provide better protection to sensitive equipment such as semiconductors, capacitors and transformers.In comparison to other types of fuses, SSTCs are smaller, do not require a large ampacity derating factor, and have a higher energy rating. They are also designed to carry bigger current without breaking down. This makes them suitable for applications such as topology-fused converters.SSTCs work by virtue of a bimetallic strip that is composed of two dissimilar metals, each with a different thermal coefficient of expansion. When current flows through this strip, it causes the strip to heat up and bend. This bending action trips the fuse and causes the link to open.There are different types of SSTCs available in the market, depending on the type of application. This includes circuit breakers for overcurrent protection, fused switches for overvoltage protection and surge protectors.In addition to their uses as overcurrent protection devices, SSTCs are also used for surge suppression. In this application, the SSTC fuse must be able to respond to both high-amplitude and short-duration overvoltages. This type of fuse is not suitable for use with unfiltered power supplies, as this can cause pulsating current that the fuse cannot withstand.The working principle of SSTCs is relatively simple. When connected to a power source, the current passes through the bimetallic strip in the fuse. This causes the strip to heat up and bend, which trips the link and causes the fuse to open.In summary, the super short cycling time circuit fuse is an important yet lesser-known form of fuse that plays an important role in safety and protection applications. SSTC fuses are small, have a fast cycling time and high energy rating, and are specifically designed for applications such as converters, power supplies, variable-speed motor controllers, UPS systems and surge protection. They are activated by a bimetallic strip that is heated up by the current flow, causing it to bend and trip the link.

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Part Number	Manufacturer	Price	Quantity	Description