BK1/MCRW4A

Response Time:	Fast
DC Cold Resistance:	0.023 Ohms
Size / Dimension:	0.125" Dia x 0.280" L (3.18mm x 7.10mm)
Color:	--
Operating Temperature:	--
Approvals:	CSA, UL
Melting I²t:	1.6
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:	4A
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Part Status:	Obsolete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 electrical components that protect against short circuits, overcurrents, and sometimes other faults, such as overloads. One type of fuse, the BK1/MCRW4A, is a self-contained, double break fuse element suitable for low voltage high amperage applications. This article will discuss the application field and working principle of a BK1/MCRW4A fuse.

Application Field

The BK1/MCRW4A fuse was designed to provide protection in medium-voltage power circuit breakers that operate at either 120/250VDC or 30 Amps, and 500VAC up to 200,000 Amps. It is also suitable for use in instruments and controllers and in high-power distribution networks. In these applications, the BK1/MCRW4A fuse provides reliable coordination and overload protection.The BK1/MCRW4A fuse is also suitable for use in transformers and switchgear, where protection against high-current overloads and short circuits is necessary. In order to provide the necessary current rating capability, the fuse elements can be combined to form longer than standard breaks, allowing for enhanced current ratings.

Working Principle

The BK1/MCRW4A fuse works by breaking the circuit as soon as the current in the circuit exceeds the fuse’s amperage rating. This is accomplished by using an electrical current sensitive element that is designed to melt when too much current passes through it. When the current exceeds the element’s rating, the melting element will quickly break the circuit.The current sensitive element consists of two pieces of silver, and an insulated copper frame. The two pieces of silver are positioned on the base and are separated by a distance equal to the breaking gap. The insulated copper frame is located around the outside of the two pieces of silver, and it acts as an insulating material to ensure that the current will only pass through the two pieces of silver and not around the frame.When the current passes through the two pieces of silver, it creates a potential difference between them, and this causes the silver to heat up and melt. Once the silver melts, it causes the entire element to break, thus breaking the circuit and preventing the current from continuing to flow.

Conclusion

The BK1/MCRW4A fuse is a self-contained, double-break fuse element suitable for low voltage, high amperage applications. The fuse is suitable for use in medium voltage power circuit breakers, as well as transformers and switchgear. The fuse works by breaking the circuit as soon as the current exceeds the amperage rating, using an electrical current sensitive element that melts when too much current passes through it. This ensures reliable coordination and overload protection, making it an ideal solution for a wide variety of applications.

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