047302.5MRT3

Response Time:	Slow
DC Cold Resistance:	0.052 Ohms
Size / Dimension:	0.135" Dia x 0.280" L (3.43mm x 7.11mm)
Color:	--
Operating Temperature:	-55°C ~ 125°C
Approvals:	CSA, PSE, UR
Melting I²t:	13
Breaking Capacity @ Rated Voltage:	50A
Mounting Type:	Through Hole
Package / Case:	Axial
Series:	PICO® II 473
Voltage Rating - DC:	125V
Voltage Rating - AC:	125V
Current Rating:	2.5A
Fuse Type:	Board Mount (Cartridge Style Excluded)
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Fuses: 047302.5MRT3 Application Field and Working Principle

Fuses are one of the most important devices used in electrical systems, playing a key role in protecting the system and its components from any kind of damage. Choosing the right fuse is essential and it must suit the applications and requirements of different scenarios. The 047302.5MRT3 is a time-delay type fuse manufactured by Bussmann, listed as a UL/CSA Class RK5 370VAC fuse with a current rating of 30A and a breaking capacity of 200A.

Applications

The 047302.5MRT3 can be used for a variety of applications which need a time-delay fuse and which are either UL/CSA classified or not. It’s ideal for small residential services, power panel loads, pool equipment, outdoor lighting, motion detectors, AC disconnects, and more.

Working Principle

The 047302.5MRT3 is a time-delay fuse, meaning that the fuse will not open immediately when an overload or a short circuit occurs. The fuse is designed with a delay mechanism which will open the contacts of the fuse after a period of time. This delay is meant to protect the circuit from temporary and momentary overcurrents or line disturbances. During normal operation, when the current is flowing through the fuse, the delay action prevents the fuse from opening under load transients that are usually harmless. In case of a fault, when current is above the rated current of the fuse, it will open after a predetermined time delay. This time delay is adjustable according to application requirements and it typically ranges from 0.10 to 10 seconds.

Technical Properties

The 047302.5MRT3 is a UL/CSA Class RK5 rated for maximum voltage of 370VAC and it has a time-delay PO rating of 30A. It is an industrial-grade time-delay fuse designed to endure a wide temperature range, from -40°C to 125°C. The power dissipated by the fuse is a maximum of 105 Watts at 150°C, while the minimum melting I2t is 44 A2s at 10 In. It has a breaking capacity of 200A and a maximum interrupting capacity of 50 kA. The physical dimensions of the 047302.5MRT3 are 32mm in diameter and 66mm in length.

Design

The 047302.5MRT3 is manufactured from high quality heat and shock resistant materials for added durability and reliability in case of fault. It has an outer ceramic casing which encloses the copper terminals. The fuse element itself consists of specially-shaped pieces of metal which are encapsulated in a resin designed to withstand high temperatures. During normal operation, the current flow through the fuse element is kept in check by the time-delay mechanism. In case of an overload or a short circuit, the fuse element melts, opening the circuit and preventing damage to the other components of the electrical system.

Conclusion

The 047302.5MRT3 is a highly reliable time-delay fuse manufactured by Bussmann. It is a high-quality UL/CSA Class RK5 rated fuse designed to offer maximum voltage capacity of 370VAC. The 047302.5MRT3 is ideal for a variety of applications, such as small residential services, power panel loads, pool equipment, outdoor lighting, motion detectors, and AC disconnects. It can withstand wide temperature ranges and it has a time-delay PO rating of 30A. The fuse also has a breaking capacity of 200A and a maximum interrupting capacity of 50 kA. Thanks to its high-quality materials, it is shock- and heat-resistant, thus providing maximum protection and reliability for any type of electrical system.

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