LH1556AB

Series:	LH1556
Packaging:	Tube
Part Status:	Obsolete
Mounting Type:	Through Hole
Circuit:	SPST-NO (1 Form A) x 2
Output Type:	AC, DC
Voltage - Input:	1.26VDC
Voltage - Load:	0V ~ 350V
Load Current:	120mA
On-State Resistance (Max):	28 Ohms
Termination Style:	PC Pin
Package / Case:	8-DIP (0.300", 7.62mm)
Supplier Device Package:	8-DIP

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Solid State relays are electronic devices that allow current to pass between two terminals using the principles of semiconductor based switching devices. They are widely used in many industries, especially in automation and industrial control applications, due to their low power consumption and excellent switching ability. The most common type of Solid State Relay (SSR) used in these applications is the LH1556AB.The LH1556AB is a single-pole, double throw (SPDT) SSR relay with two independent contacts. This relay is designed for use in air conditioned equipment, such as air conditioners, furnaces, and air handlers. It is also suitable for use in a wide range of other applications that require switching between two different electrical circuits.The LH1556AB is typically used in environments where there is a need to switch two circuits with a single operation. In air conditioning units, it is often used to switch between heating and cooling modes. It is also used in industrial applications, such as motor controls and high voltage switches. The LH1556AB can be set up to switch automatically based on an external signal, such as a temperature or pressure increase, or a programmed on/off cycle.The LH1556AB uses a sensitive current switching principle to operate. The relay is composed of two sets of contacts, separated by a load resistor. Each set of contacts is controllable by an independent signal input, with the two sets forming an optocoupler circuit. When a signal is applied, the optocoupler will request the input circuit to turn on, allowing current to flow across the load resistor and energize the relay. The current operates a magnet that is used to actuate the switch contacts, allowing current to pass between the two circuits.The LH1556AB is designed with a very small power consumption and a high switching speed, which makes it suitable for use in a wide variety of situations. It can operate from an AC or DC voltage supply, and is known to have a reliable and repeatable operation. Furthermore, the LH1556AB has a long life expectancy, making it an attractive choice for an industrial application.The LH1556AB offers excellent protection against noise and interference, and is therefore an excellent choice for use in environments where radio frequency (RF) interference is a concern. It is also robust enough to withstand high temperatures, making it suitable for outdoor applications.The LH1556AB is an effective and versatile choice for applications involving switching or controlling two different circuits with a single operation. Its low power consumption, robust construction, and long life expectancy make it well suited for many industrial and commercial applications.

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