0464005.DR Circuit Protection

Package / Case:	2-SMD, Square End Block
DC Cold Resistance:	0.0119 Ohms
Size / Dimension:	0.476" L x 0.177" W x 0.177" H (12.10mm x 4.50mm x 4.50mm)
Color:	--
Operating Temperature:	-55°C ~ 125°C
Approvals:	PSE, UMF
Melting I²t:	23.6
Breaking Capacity @ Rated Voltage:	100A
Mounting Type:	Surface Mount
Series:	NANO²® 464
Response Time:	Fast
Voltage Rating - AC:	250V
Current Rating:	5A
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 is DR Fuse?DR fuses are a type of fuse designed to protect against the very high currents that flow during motor startups. These are used for protection of high current draw motors in industry, and can be found in a wide variety of applications. DR fuses, or current-limiting fuses, work by limiting the amount of current that is allowed to pass through them during a motor startup situation. This helps prevent the motor from being over-stressed, which can result in reduced life span and performance. Applications of DR FusesDR fuses are designed specifically for motor protection and are used in a variety of different applications. Some common applications where DR fuses are used include:• Industrial Motor Control Panels: DR fuses are commonly found in industrial motor control panels, providing protection for the various motors and other components in the system. • Commercial Buildings: DR fuses are also widely used in commercial buildings to protect the large motors used in HVAC, elevators, and other commercial applications.• Emergency Power Systems: DR fuses are also used in emergency power systems to protect the large emergency motors that are often used.• Marine and Locomotive: DR fuses are typically found in electrical systems on ships and locomotives, providing protection to these large motors. In all of these applications, DR fuses are used to protect the motors and other components from the potential damage caused by high current draw during motor startups. Construction of DR FusesDR fuses are usually constructed as a combination of several other components. The main component is the conductor that is used to conduct the high starting currents of the motor. This conductor is usually made from a silver alloy, and it is wrapped in an insulating material such as ceramic. The conductor is then connected to a fusible link, which is designed to melt when the actual Melting current of the motor is exceeded. Finally, the fuse is sealed in an enclosure, typically made from Bakelite to prevent the fusible link from shorting. Working Principle of DR FusessThe working principle of DR fuses is relatively simple. The high starting current of the motor causes the fusible link to heat up and melt, which breaks the circuit and prevents the high current from flowing through the system. The Melting current is determined by the size of the fusible link itself, which is usually sized to be able to handle the expected starting current of the motor. The melting time is also determined by the size of the link, which can be adjusted to accommodate the different types of potential faults that may occur. Advantages of DR FusesUsing DR fuses to protect motors has a number of advantages over other types of protection. They are able to provide a higher level of protection than other types of fuses due to their fast response time and their ability to handle high current draws. They are also relatively inexpensive, which makes them a popular choice for motor protection in many applications. Disadvantages of DR FusesThe main disadvantage of DR fuses is that they must be regularly checked and replaced if they have been used. This is due to the fact that the fusible link will be melted and weakened over time, which will reduce its effectiveness. Additionally, if the fuse is not properly sized for the motor then it may not be able to protect the motor properly. ConclusionDR fuses are an important tool for protecting motors from high current draw during motor startups. They are relatively inexpensive, and are used in a variety of applications. The main disadvantage of using DR fuses is that they must be replaced regularly as they weaken over time. However, they provide a high level of protection and can be effectively used in a variety of applications.

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