03121.25H

Package / Case:	3AB, 3AG, 1/4" x 1-1/4"
DC Cold Resistance:	0.138 Ohms
Size / Dimension:	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Color:	--
Operating Temperature:	-55°C ~ 125°C
Approvals:	CSA, UL
Melting I²t:	1.45
Breaking Capacity @ Rated Voltage:	35A
Mounting Type:	Holder
Series:	312
Response Time:	Fast
Voltage Rating - AC:	250V
Current Rating:	1.25A
Fuse Type:	Cartridge, Glass
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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03121.25H Fuses Application Field and Working Principle

Fuses are safety devices used for electrical overload protection and are one of the most common components in the modern electronics industry. Within such products, 03121.25H fuses have a specific application field and a distinct working principle.

03121.25H Application Field

03121.25H fuses are typically used in low voltage circuits including motor-driven control boxes, electronic equipments, and small power distribution systems. They possess a host of features and are broadly desired for their reliable performance and current-limiting characteristics, making them ideal for use in any number of applications.In particular, they are most often employed with industrial control systems which have a high overcurrent load. With their robust construction and long-term stability, low-voltage fuses are also commonly used in redundant power systems, such as those found in mission critical settings.

03121.25H Working Principle

03121.25H fuses work on the principle of a resistive element – typically fusing wire – designed to heat up and break down under an overload current. This can be achieved by placing two components – a resistive element and a base material – in series inside the fuse body using a crimp joint.When an overload occurs, the electrical current passes through the resistor, causing it to heat up until it melts the base material, forming a gap between the two components. This gap interrupts the current and causes the fuse to ‘blow’, thereby preventing further current and associated damage to the electronic device.

Conclusion

03121.25H fuses offer a reliable and effective form of overload protection for various types of electronics. Due to their stature in the industry, they are often installed in settings where voltage is below 600 volts and current is below 100 amperes. The working principle of these fuses involves a heat-resistant element that is designed to melt under overload current and break the circuit, thus preventing further damage to the electronic device.

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