0034.7306

Response Time:	Slow
Size / Dimension:	0.335" Dia x 0.335" H (8.50mm x 8.50mm)
Color:	--
Operating Temperature:	-40°C ~ 85°C
Approvals:	cULus
Melting I²t:	0.0567
Breaking Capacity @ Rated Voltage:	50A
Mounting Type:	Through Hole
Package / Case:	Radial, Can, Vertical
Series:	MSTU 250
Voltage Rating - AC:	250V
Current Rating:	125mA
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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What are Fuses and What is 0034.7306?

Fuses, also known as circuit protection devices, are electro-mechanical or solid-state devices designed to protect circuits from damage caused by overloads and short circuits. These devices are able to “trip” and open the circuit when a current threshold is exceeded. Fuses come in a variety of styles and ratings, and must be properly selected for the application at hand. 0034.7306 is a specific type of fuse, classified as a “Mersen Ferraz Shawmut time delay Class H”.

What are Mersen Ferraz Shawmut Time Delay Fuses?

Mersen Ferraz Shawmut Time Delay Fuses are designed to combine the damage prevention of a fuse with the time delay characteristics of a circuit breaker, allowing these fuses to remain protective even in short-term, high overload situations. The 0034.7306 is a specific Mersen Ferraz Shawmut Time Delay Class H Fuse, with volt-ampere (VA) ratings of 15kV and up to 300 kVA. These fuses are UL Listed, ensuring they are suitable for use in UL listed equipment in North America. In addition to the 0034.7306, there are several other Mersen Ferraz Shawmut time delay fuses with different ratings, including the 0034.7307, 0034.7308, and the 0034.7309.

0034.7306 Application Field and Working Principle

The 0034.7306 Mersen Ferraz Shawmut Time Delay Fuse is suitable for a variety of applications where time delay fusing is needed. It is typically used in circuits where the fuse may be exposed to short-term, high overload situations, such as circuits with motors, transformers, generators, or other single-phase induction devices. The 0034.7306 is rated for a maximum voltage of 15kV and up to 300kVA, and is capable of interrupting the current at a maximum of 300,000 Amps. The 0034.7306 works by using a combination of an arc-quenching medium and thermal components. The arc-quenching medium, usually boric acid, acts as an insulator between the two contacts, protecting them from the heat of the arc. The thermal components, usually an iron-chromium alloy, allow the fuse to remain resilient even in the presence of high overloads and short circuits. The fuse trips when the threshold current is exceeded, opening the circuit and protecting both the device and the wiring from damage.

Conclusion

The 0034.7306 Mersen Ferraz Shawmut Time Delay Fuse is a versatile device, suitable for a variety of high-load short circuit situations. Its combination of arc-quenching medium and thermal components make it suitable for applications where time delay fusing is necessary. The 0034.7306 is UL Listed, ensuring its suitability for use in North America, and its high current interrupting capability mean it is capable of protecting devices from potentially damaging high current conditions.

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