SR-5H-1.25A-AP

Package / Case:	Radial, Can, Vertical
DC Cold Resistance:	0.06 Ohms
Size / Dimension:	0.335" Dia x 0.362" H (8.50mm x 9.20mm)
Color:	--
Operating Temperature:	-40°C ~ 85°C
Approvals:	CCC, cULus, KC-MARK, PSE, SEMKO, VDE
Melting I²t:	13
Breaking Capacity @ Rated Voltage:	100A
Mounting Type:	Through Hole
Series:	SR-5H
Response Time:	Slow
Voltage Rating - AC:	300V
Current Rating:	1.25A
Fuse Type:	Board Mount (Cartridge Style Excluded)
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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Introduction

Fuses are a vital component of electrical systems and equipment, providing overload and short circuit protection. There are many different types, each suitable for different applications and with their own unique characteristics and performance. The SR-5H-1.25A-AP is one of the most popular types of fuses, commonly used in medium voltage AC power distribution systems, process control and other industrial applications. In this article, we will look at the characteristics and application field of the SR-5H-1.25A-AP, as well as its working principle.

Characteristics and Application Field of the SR-5H-1.25A-AP

The SR-5H-1.25A-AP is a medium-freqency miniaturized fuse manufactured by Siemens. It is mainly used for over-current and short-circuit protection in medium voltage AC power distribution systems, lighting control and industrial control systems. It is one of the most popular types of fuses and is widely used in the industry. The fuse body is constructed of silver-plated copper for optimal thermal contact and protection. It has a UL listing rating of 10A at 250V AC, and an interrupting rating of 10kA at 250V AC. The SR-5H-1.25A-AP also meets CSA and TUV standards for safety and performance, as well as having an operating range from 0 to 400A at 300V AC. It has a variety of circuit protection features including current limitation, variable current setting, time delay current setting, and indication and protection functions. It also has a wide operating temperature range of -40 to 70°C.

Working Principle of the SR-5H-1.25A-AP

The SR-5H-1.25A-AP fuse works on the principle of thermal-magnetic protection. It is designed to provide over-current and short-circuit protection to equipment. It works by creating an arc across two terminals when an overload or short circuit occurs. This arc is detected by a thermal-magnetic device, which then trips a relay or other device to shut off the circuit.When the overload current exceeds the predetermined rating, the contacts in the fuse open, interrupting the circuit. This causes the current to cease flowing and the arc to be extinguished. The interruption of the current is the fuse’s primary function.When a short circuit occurs, the current increases to a point where it exceeds the fuse’s rated current. This will cause the fuse to open quickly, interrupting the circuit before it can cause serious damage to the equipment. The SR-5H-1.25A-AP fuse has a built-in indication device that will tell the user when the fuse has operated. This allows the user to quickly determine the cause of the overload or short-circuit condition and take the necessary steps to rectify the problem.

Conclusion

The SR-5H-1.25A-AP fuse is one of the most widely used fuses in medium voltage AC power distribution systems, process control and other industrial applications. It is constructed of silver plated copper for optimal thermal contact and protection, designed for current and short-circuit protection, and features a variety of circuit protection features. It also meets CSA and TUV standards for safety and performance, as well as an operating range from 0 to 400A at 300V AC. And finally, it has a built-in indication device to alert the user when the fuse has operated.

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