045402.5NR

Package / Case:	2-SMD, Square End Block
Mounting Type:	Surface Mount
Breaking Capacity @ Rated Voltage:	50A
Melting I²t:	15
Approvals:	CSA, PSE, UL
Operating Temperature:	-55°C ~ 125°C
Color:	--
Size / Dimension:	0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)
DC Cold Resistance:	0.045 Ohms
Series:	NANO²® 454
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Fuse Type:	Board Mount (Cartridge Style Excluded)
Current Rating:	2.5A
Voltage Rating - AC:	125V
Voltage Rating - DC:	125V
Response Time:	Slow

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Introduction

Fuses are an essential part of any electrical system, and the 045402.5NR is a particular type of fuse designed to provide slow-blow protection for motors. This type of fuse offers an effective solution for protecting motors from overloads and short circuits while also providing reliable protection without causing significant interference with the motor’s operation. This article will provide an overview of the 045402.5NR application field and working principle.

Applications

The 045402.5NR slow-blow fuse is designed to be used in motor circuit protection applications. As such, it is suitable for use in a wide variety of motors, including household electric motors, AC induction motors, DC motors, and single-phase and polyphase motors. In addition, these types of fuses can be used in pump motors, HVAC motors, fractional and sub-fractional motors, and servo and solenoid motors. By protecting motors from both overloads and short circuits, the 045402.5NR slow-blow fuse helps to prevent motor damage and ensure operational efficiency.

Working Principle

In order to effectively protect motors from overloads and short circuits, the 045402.5NR slow-blow fuse is designed to allow a motor to experience a low-current surge at startup without tripping. This is accomplished through the use of a low melting-point alloy. When a current flows through the fuse, the low melting-point alloy will melt, thus creating a low resistance path for the current. This enables the motor to experience a low-current surge at startup without tripping the fuse.Once the motor has started, the current that flows through the fuse will be evaluated against its rated current value. If the current exceeds this value, the low melting-point alloy will melt again and the over-current will be diverted through the fuse, thus breaking the circuit and protecting the motor. This type of fuse is designed to react more slowly to overloads than fast-blow fuses, thus providing more reliable protection with less risk of nuisance tripping.In addition to providing protection from overloads, the 045402.5NR slow-blow fuse also provides protection from short circuits. When a short circuit occurs, the current will exceed the motor’s rated current value. In this situation, the low melting-point alloy will quickly melt, thus diverting the high current away from the motor and breaking the circuit, thus providing short-circuit protection.

Conclusion

The 045402.5NR is a slow-blow fuse designed for use in motor circuit protection applications. This type of fuse allows for a low-current surge at startup without tripping, and provides reliable protection from both overloads and short circuits. This fuse is an effective solution for ensuring the operational efficiency and longevity of motors in a wide variety of applications.

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