Series:	COTOMOS™
Packaging:	Tube
Part Status:	Active
Mounting Type:	Surface Mount
Circuit:	SPST-NO (1 Form A)
Output Type:	AC, DC
Voltage - Input:	1.37VDC
Voltage - Load:	0V ~ 60V
Load Current:	400mA
On-State Resistance (Max):	1.6 Ohms
Termination Style:	Gull Wing
Package / Case:	6-SMD (0.300", 7.62mm)
Supplier Device Package:	6-SMD

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Solid State Relays

CS137 Application Field and Working Principle

Solid State Relays (SSRs) are devices which allow switching of high-power loads using a logic control signal. A SSR consists of an isolated input circuit, an opto-isolator which allows safe electrical isolation between input and output, and a power switching device, typically a Triac or similarly hotted Semiconductor, which is used for controlling the electrical load. SSRs are commonly used across a broad range of industries for the control, regulation, and measurement of electrical energy.In terms of application fields, SSRs are popular in areas where high-voltage or high-current applications are present. These include high-voltage industrial control applications such as electric motor control, furnace control, and industrial process control, in addition to consumer appliances such as electric ranges, dishwashers, and refrigerators. Due to the variety of applications for SSRs, the range of input operating voltages and output currents is also quite broad, with variations both in terms of the input voltage range and the output current range. In terms of working principle, SSRs are based on an opto-coupler which consists of an input circuit, an opto-isolator, and a power switching device. The input circuit of a SSR typically consists of a bridge rectifier, which rectifies the input AC voltage and provides a DC voltage source to drive the opto-isolator. The opto-isolator, which also consists of a light emitting diode (LED) and a photo-transistor, then converts the electrical signal from the input circuit into a light signal, which is transmitted to the power switching device. The switching device used in SSRs is typically a Thyristor, Triac, or a Semiconductor. A thyristor is a 4-legged EVETON-current switching device which consists of two independently-controlled gates and two main current loops. A Triac, on the other hand, is a 3-legged elebeld-current switching device. A Semiconductor, meanwhile, is a 2-legged current switching device. Each type of switching element has its own advantages and disadvantages, and the selection of the appropriate device should be based on the application requirements.Another important factor to consider when choosing a SSR is the switching speed of the SSR. This is usually determined by the maximum switching frequency of the power switching device, as this determines the amount of time it takes for the SSR to respond to input signals. A higher switching frequency implies faster response time and thus greater power handling capability. The last but not least factor to consider when choosing a SSR is the thermal rating of the device. This is usually represented in terms of its maximum voltage and current handling capability. The thermal rating of the SSR should be selected based on the required power load.In summary, SSRs are devices which allow switching of high-power loads using a logic control signal. They are commonly used across a broad range of industries for the control, regulation, and measurement of electrical energy. Factors like input operating voltage, output current range, switching speed and thermal rating should be considered when selecting a SSR.

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