SF-0603S300-2 Circuit Protection

Package / Case:	0603 (1608 Metric)
DC Cold Resistance:	0.016 Ohms
Size / Dimension:	0.063" L x 0.032" W x 0.018" H (1.60mm x 0.80mm x 0.45mm)
Color:	--
Operating Temperature:	-40°C ~ 105°C
Approvals:	UL
Melting I²t:	0.21
Breaking Capacity @ Rated Voltage:	50A
Mounting Type:	Surface Mount
Series:	SinglFuse™ SF-0603S
Response Time:	Slow
Voltage Rating - DC:	32V
Current Rating:	3A
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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Introduction

The SF-0603S300-2 product is a type of fuse. Fuses are widely used in many products and applications. Generally, these products come with a simple and convenient mechanism for overcurrent protection of electrical circuits. However, it is not always easy to know exactly when and how to use a fuse in its application field. To better understand their capabilities, this article will cover the roles and working principles of the SF-0603S300-2 fuse.

Application Field

The SF-0603S300-2 is an UL 248 series, Class R fast-acting fuse. This particular type of fuse is designed for exceptional mechanical strength and reliable circuit protection. As such, the SF-0603S300-2 fuse is a great choice for circuits that are located in easily movable or frequently vibrated space, such as in an automotive engine compartment. Another example of the SF-0603S300-2’s application field is in the protection of low-voltage DC and AC electrical circuits. Its miniature size makes it an excellent choice for size-restricted applications such as indoor electronic equipment that is installed in tight spaces. In addition, the SF-0603S300-2 has also been developed to provide ultra-rapid protection for short-circuits as well as overloads with extreme overcurrents.

Working Principle

The SF-0603S300-2’s working principle is extremely simple. When too much current passes through the circuit, the heat generated in the fuse will cause the metal wire inside the fuse to vaporize quickly. This sudden change in the wire’s resistance will cause a momentary but intense increase in the temperature of the current. As a result, the fuse will immediately cut the connection between the circuit’s positive and negative sides, thus protecting the circuit from overheating and further damage.In order to ensure that the fuse works properly, users should always pay attention to its electrical ratings. The typical rated voltage of the SF-0603S300-2 is 300V, and its rated amperage is 3A, indicating the amperage of current the fuse can handle without blowing. If the current is higher than the rated value, the fuse will be damaged gradually until it blows open in order to protect the circuit. Additionally, the SF-0603S300-2 also offers a maximum voltage drop of just 0.2 volts. This ensures that when the fuse activates, it will not cause high power losses across the circuit.

Conclusion

To sum up, the SF-0603S300-2 is an appropriately sized fast-acting fuse, designed for good mechanical strength and reliable overcurrent protection of low-voltage DC and AC circuits. It is designed to offer ultra-rapid protection for short-circuits and overloads while minimizing power losses. The working principle is extremely simple: when too much current passes through the circuit, the heat generated will cause the metal wire in the fuse to vaporize, which will cause the circuit to cut off in order to protect it. The users should always pay attention to its electrical ratings in order to ensure that the fuse works properly.

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