Response Time:	Fast
DC Cold Resistance:	0.018 Ohms
Size / Dimension:	0.125" Dia x 0.280" L (3.18mm x 7.10mm)
Color:	--
Operating Temperature:	--
Approvals:	CSA, UL
Melting I²t:	3
Breaking Capacity @ Rated Voltage:	50A AC, 300A DC
Mounting Type:	Through Hole
Package / Case:	Axial
Series:	Microtron® MCRW
Voltage Rating - DC:	125V
Voltage Rating - AC:	125V
Current Rating:	5A
Fuse Type:	Board Mount (Cartridge Style Excluded)
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

Fuses are a type of protection device used to protect electrical circuits from short-circuits, overcurrents, and overloads. BK1/MCRW5A is one type of fuses, which finds widespread use in the modern electrical industry as current limiting and overvoltage protection devices. This paper will discuss the applications and working principle of the BK1/MCRW5A fuse.

Applications

The BK1/MCRW5A fuse is an advanced, fast-acting type of fuse which finds use in a wide variety of applications. It is widely used in wire-wound transformers, motors, capacitors, and other related equipment. It is also suitable for use in voltage and current sensors, voltage and current isolators, and voltage regulation systems.In addition, the BK1/MCRW5A has found use as a current limiter for automotive electrical systems, as well as an overvoltage protector in low-voltage DC sources and other associated systems. This type of fuse is also used in low-voltage AC and DC circuits, which works to protect against surges or under-voltage protection. The BK1/MCRW5A fuse is an ideal choice for both commercial and industrial applications.

Working Principle

The BK1/MCRW5A fuse functions as a two-way protection device. When the current exceeds the rated value, the fuse melts, interrupting the circuit and protecting the equipment from further harm. Additionally, the fuse also prevents the flow of reverse polarity currents and acts as a high-voltage isolation device.Like other fuses, the BK1/MCRW5A works on the principle of melting the metal strip when the current exceeds the rated value. The strip is usually made up of tin or silver, and melts when the current flows through it. It is important to note that the melting time of a fuse is typically short, usually ranging from one millisecond to one second.The BK1/MCRW5A uses a “cold depolarization” technology, which is an advanced form of signal separation and current sampling. The current sensor is placed in close proximity to the fuse element and measures the instantaneous reaction of the fuse to a given overcurrent condition. This allows for optimum overcurrent protection and short circuit switching.

Conclusion

The BK1/MCRW5A fuse is a versatile protection device suitable for use in a variety of applications. It is designed to both protect electrical circuits from overcurrents, overvoltages, and short circuits, and also acts as an isolator and current limiter. The fuse utilizes a unique “cold depolarization” technology to ensure quick response and reliable operation.

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