SL22 50004

R @ 25°C:	50 Ohms
Tolerance:	±20%
Current - Steady State Max:	4A
R @ Current:	440 mOhms
Diameter:	0.866" (22mm)
Lead Spacing:	0.307" (7.80mm)
Approvals:	CSA
Series:	SL22
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--

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Inrush Current Limiters (ICL): SL22 50004 Application Field and Working Principle

Inrush current limiters (ICLs) are essential components, which can provide overcurrent protection against high inrush current. The SL 22 50004 is one of the most popular ICLs and it has been used in a variety of applications, from motor control to consumer electronics. This article will provide an introduction to the application field and working principle of this ICL.

What is Inrush Current and Why is it Problematic?

Inrush current is a temporary surge of electric current that occurs when a device is first powered-on. This increased current draw can often be large enough to cause damage to the device or to the wiring of the power supply. This is especially true in devices with large capacitors or inductors, which can store and then rapidly discharge large amounts of energy.

The SL22 50004 Inrush Current Limiter

The SL22 50004 inrush current limiter is designed to mitigate the potential damage from inrush current. It is a small, thermal device which functions by automatically limiting the inrush current through a heating element, typically by a thyristor. The SL22 50004 features a wide operational temperature range of -55C to +125C and a wide voltage range of 8 to 474 V. In addition, it has a maximum current rating of up to 1600A (at 10ms) and a response time of 1-10ms. The device comes in a TO-220AB package and offers terminal-to-terminal isolation.

Applications for the SL22 50004

The SL22 50004 is suitable for a variety of applications, such as:

• Electric motor control units
• Uninterruptible power supplies
• High power consumer electronics
• Charging systems for electric vehicles and batteries
• Power tools and instrumentation
• Electric auxiliary equipment

Working Principle of the SL22 50004

The working principle of the SL22 50004 is quite simple. When the power is switched on, the inrush current is initially quite high, but as the heat generated by the SL22 50004 increases, the device will limit the inrush current. This in turn will reduce the amount of current running through the components and thus reduce the risk of the device being damaged.The SL22 50004 is equipped with two current sensors; one on the input (the "inrush current") and one on the output (which is referred to as the "limited current"). In normal-running conditions, the SL22 50004 will maintain a steady current and will not limit the current flow. However, when the input current exceeds a certain limit, the SL22 50004 will trigger the thyristor and limit the output current. This limits the maximum current flowing through the components and thus reduces the risk of damage.

Conclusion

The SL22 50004 is a reliable inrush current limiter that is suitable for a variety of applications. It features a wide range of operational temperatures and voltages, a maximum current rating of up to 1600A (at 10ms) and a response time of 1-10ms. The device is compact and comes in a TO-220AB package, and offers terminal-to-terminal isolation. Finally, its functioning principle is simple; it automatically limits the inrush current by triggering the thyristor when the input current exceeds a certain limit.

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