AQA221VL

Series:	AQ-A
Packaging:	Bulk
Part Status:	Active
Mounting Type:	Chassis Mount
Circuit:	SPST-NO (1 Form A)
Output Type:	AC
Voltage - Input:	4 ~ 32VDC
Voltage - Load:	75V ~ 250V
Load Current:	15A
Termination Style:	Screw Terminal
Package / Case:	Hockey Puck
Supplier Device Package:	--

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AQA221VL Solid State Relay Application Field and Working Principle

Solid state relays are devices that are used to control power at the switch level of AC and DC circuits. The AQA221VL solid state relay is a popular type of solid state relay used for electrical applications that require low power switching, such as traffic signals, lighting, and audio visual systems. This article will discuss the application field and working principle of the AQA221VL solid state relay.The AQA221VL is a compact, low profile, compact and lightweight solid state relay. It is engineered to deliver high electrical performance, exchange fast, and have superior thermal management. The AQA221VL is available in single- and double-pole varieties, with positive or negative logic, and with or without adjustable sensitivity. The AQA221VL is especially popular in commercial and industrial applications where low energy cost is a priority.The AQA221VL solid state relay is designed for various applications due to its low power consumption, high switching speed, and flexible design. These features make the AQA221VL suitable for applications that require large currents or have limited switching space. Additionally, the AQA221VL is also popular in applications that require precise control of the power, such as lighting, temperature control, and communications systems.In order to understand the application field and working principle of the AQA221VL, it is important to understand the basic components of the device. The AQA221VL consists of a power output device called a SCR (Silicon Controlled Rectifier), a photo-sensitive input device called a photocoupler, and an isolated DC-DC converter to provide the appropriate voltage levels. The power output device controls the voltage and current of an AC or DCload, while the photocoupler is responsible for transforming signals from logical states (high and low) to corresponding electrical output levels.The working principle of the AQA221VL is based on the “Zero-Crossing” method. This method uses a switching device called an SCR, which works on a change in the direction of the current in an AC circuit. When the voltage across an SCR exceeds a certain threshold, known as the “gate turn-on threshold”, it will conduct the current to the output load. When the current falls below the gate turn-off threshold, the SCR will stop conducting the current, thus turning off the load. The AQA221VL also utilizes a photocoupler device, which uses a photodiode sensitive to low intensity light to obtain an electrically isolated signal. When a high signal is received, the optically isolated signal is transmitted to the SCR, thus completing the Zero-Crossing circuit.The AQA221VL is also a reliable device with a long lifetime and low operating temperature. The AQA221VL is designed to operate in temperatures ranging from -20 to 70° C, and has a variety of safety features such as overload protection, temperature monitoring, and short-circuit protection. The AQA221VL is also UL and CUL certified, which ensures that the device meets safety standards.The AQA221VL is an advanced and versatile solid state relay with a wide range of application fields and a simple but effective working principle. The device can be used for controlling voltage and current in AC and DC circuits for a variety of applications, including lighting, temperature control, and communications systems. The zero-crossing circuit is reliable and low powered, and the device has several safety features that make it suitable for commercial and industrial applications. The AQA221VL is a great choice when trying to find a solid state relay that will provide reliable operation in even the most demanding environments.

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