0279.400V

Melting I²t:	0.0251
Approvals:	CSA, QPL, UL
Operating Temperature:	-55°C ~ 85°C
Color:	--
Size / Dimension:	0.250" Dia x 0.350" H (6.35mm x 8.89mm)
DC Cold Resistance:	0.227 Ohms
Series:	MICRO™ 279
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Fuse Type:	Board Mount (Cartridge Style Excluded)
Current Rating:	400mA
Voltage Rating - AC:	125V
Voltage Rating - DC:	125V
Response Time:	Fast
Package / Case:	Radial, Can, Vertical
Mounting Type:	Through Hole
Breaking Capacity @ Rated Voltage:	10kA

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Introduction to 0279.400V

Modern safety regulations and standards have necessitated the installation of fuses to protect electrical circuits, equipment and personnel. The 0279.400V is one such fuse that is designed for medium voltage applications. In this article, we will look at the applications of 0279.400V and its working principle.

Applications of 0279.400V

Fuse manufacturers provide 0279.400V fuses that are designed for residential, industrial and commercial applications. These fuses are rated for medium voltage systems ranging from 600 volts to 4.16kV. The 0279.400V is suitable for switching operations in a wide variety of systems including distribution and transmission transformers, industrial and commercial motors and other installations with periodic switching operations. It is applicable for short-circuit and overload protection of transformers, motors and other low-impedance switches.

Advantages & Benefits

0279.400V fuses provide many advantages and benefits. These include:1. Lower interrupting rating means the fuse is suitable for protecting devices with higher current flows2. Improved electrical characteristics over electromechanical relays, allowing for better power quality3. Longer circuit-clearing times provide extra protection against overcurrents 4. Reduced inrush current prevents the generation of arcs and overvoltages5. Excellent performance and reliability6. Rarely requires maintenance

Working Principle

The 0279.400V fuse works on the principle of a thermal-magnetic cut-out trip. When the current passes through the fuse element, it produces heat via the I2R principle. This heat is detected by the thermal cut-out, which trips the circuit breaker to prevent any damage to the equipment.The 0279.400V also has a magnetic cut-out designed for instantaneous protection against short-circuit current. When the short-circuit current exceeds the limit set by the thermal-magnetic cut-out trip, it will trip the circuit breaker, thus protecting the equipment and personnel.

Conclusion

The 0279.400V fuse is ideal for medium voltage applications where quick and reliable protection is required. It has excellent electrical characteristics, can withstand high levels of current and usually requires little-to-no maintenance. With its combination of thermal and magnetic protection, it provides a reliable level of protection against short-circuit and overload currents.

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