LH1525AT Relays

Series:	LH1525
Packaging:	Tube
Part Status:	Active
Mounting Type:	Through Hole
Circuit:	SPST-NO (1 Form A)
Output Type:	AC, DC
Voltage - Input:	1.16VDC
Voltage - Load:	0V ~ 400V
Load Current:	250mA
On-State Resistance (Max):	36 Ohms
Termination Style:	PC Pin
Package / Case:	6-DIP (0.300", 7.62mm)
Supplier Device Package:	6-DIP

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Introduction

Solid State Relays (SSRs) have been part of the electronic industry for decades. They are used in a wide range of applications, such as signal switching, process control, and power protection. Although the technology behind Solid State Relays has greatly evolved over the years, their purpose remains the same: to provide a reliable, cost-effective way to control circuits and deliver a safe, reliable level of power. In this article, we focus on the general application field and working principle of the LH1525AT, a type of Solid State Relay.

Application Field

The LH1525AT is designed for system applications in a wide range of field cases. It is especially suitable for on/off switching, phase control and level/alarm control. Other common applications include AC contactor control, DC/DC voltage control, solar/wind power control, HVAC control, switching of lamps and other lighting fixtures, processor control, emergency lighting, and power conversion. The LH1525AT is capable of controlling both AC and DC loads, with voltage ratings up to 480V AC. It features a very low on-state resistance of 0.2 Ohms, allowing it to handle high power loads up to 15A without requiring a heat sink. The operating temperature range is from -20°C to +85°C, allowing it to be used in a variety of field conditions.

Working Principle

The working principle of the LH1525AT Solid State Relay relies on a method of operation known as Zero Crossing Detection. In this method, a circuit is used to detect when the current through the load crosses zero and turns off the power to the load. The circuit then waits until the current reaches a set threshold before turning the power back on. This ensures the load is not subjected to any sudden voltage spikes when the switching is taking place.Internally, the LH1525AT consists of a thyristor device that is connected across the load. When the voltage across the thyristor reaches a certain threshold, determined by the control circuit, the thyristor switches on and activates the relay. The thyristor device then acts as a high-efficiency current limiter, ensuring that the load does not exceed the manufacturer’s recommended maximum current rating. When the voltage across the thyristor drops back below the threshold, the thyristor turns off the relay and the power to the load is cut off. The LH1525AT can be further enhanced with the inclusion of a snubber circuit. This circuit reduces the malfunctions caused by sudden voltage transients in the power line, thus improving the reliability of the device and protecting the load from any sudden voltage spikes.

Conclusion

The LH1525AT is a high-performance Solid State Relay with a wide range of applications, making it an ideal choice for controlling AC and DC loads. It features a low on-state resistance of 0.2 Ohms, allowing it to handle up to 15A of current without a heat sink and an operating temperature range of -20°C to +85°C. Thanks to its Zero Crossing Detection operation and additional snubber circuit, the LH1525AT is a robust and reliable device that can be used in a variety of electrically demanding operatingenviroments.

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