BK/EFF-2.5

Package / Case:	Radial, Can, Vertical
DC Cold Resistance:	0.02 Ohms
Size / Dimension:	0.329" Dia x 0.303" H (8.35mm x 7.70mm)
Color:	--
Operating Temperature:	-55°C ~ 125°C
Approvals:	SEMKO, UL
Melting I²t:	3.1
Breaking Capacity @ Rated Voltage:	50A
Mounting Type:	Through Hole
Series:	EFF
Response Time:	Fast
Voltage Rating - AC:	250V
Current Rating:	2.5A
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Part Status:	Obsolete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 electrical protection devices that prevent widespread damage during electrical faults associated with overcurrent, overload, or short circuits. When these conditions cause excessive current, the fuses disrupt the circuit by melting the internal contacts and interrupting the current flow. Fuses come in many styles, sizes, and designs and are made for a variety of applications including commercial, industrial, and residential. The BK/EFF-2.5 is a type of fuse designed to assist in the protection of electric circuits from overloads and short circuits.

BK/EFF-2.5 Application Field

The BK/EFF-2.5 fuse is a drop-out design, two-element fuse designed to protect electrical circuits such as load switchgear, air conditioning units, lighting and more. It is rated with a voltage rating of 250V and a current rating of 2.5A. The fuse is UL Class L Listed and meets the requirements of UL-248-5 standards. This type of fuse is suitable for single-phase circuits, and can be used in both AC and DC circuits. The BK/EFF-2.5 is a UL recognized component and UL listed for use in Mersen’s motor control centers.

BK/EFF-2.5 Working Principle

The BK/EFF-2.5 fuse functions by melting the internal contacts when a given current exceeds its rating. This interrupts the flow of electricity and prevents further damage, such as a surge or overload, from occurring. The fuse is designed with an internal thermal element and an external support assembly that contacts the thermal element when the current exceeds the required level. The heat generated due to the high current causes the thermal element to expand and melt the internal contacts. This opens the circuit, interruptsing the current flow.The design of the BK/EFF-2.5 fuse provides a consistent and reliable response when subjected to high currents. The fuse features a uniform melting curve, which means that the fuse will open within a specific range of current, providing high protection against overcurrents and short circuits. The fuse also has a low insertion and withdrawal force, allowing it to be easily installed and replaced, making the fuse suitable for many applications.

Conclusion

The BK/EFF-2.5 is a type of fuse designed for protection of industrial, commercial, and residential circuits. It is rated for up to 250V and 2.5A, and is UL Class L acknowledged and listed for use in Mersen’s motor control centers. The fuse features a uniform melting curve and a low insertion and withdrawal force, allowing it to be easily installed and replaced. The BK/EFF-2.5 fuse functions by melting the internal contacts when a given current exceeds its rating, interrupting the current and preventing further damage from occurring.

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