PAA132S

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Introduction to Solid State Relays

Solid State Relays (SSRs) are switching devices comprising two solid state components: a power semiconductor component and an input Optocoupler. SSRs are typically used in applications where the control input signal is a low-level voltage, but the load requires a higher voltage. The advantages of SSRs compared to conventional electromechanical relays are many. They require no extra power to maintain the switched state, have no mechanical moving parts, and are compact and build using robust industrial-grade materials.

PAA132S Application Field and Working Principle

The PAA132S series is a mid-power 35A SSR with a current rating of 50A. What makes the PAA132S series special is its high operating temperature of up to 105℃, making it ideal for applications in harsh environments. The PAA132S series features a zero-crossing design, which is highly effective in reducing noise and RFI generated by the switching. The series also features a dynamic saturation voltage for long-term stability, protecting your system from over-voltage.

The working principle of the PAA132S is based on the solid state components within. The power semiconductor component is a silicon-controlled rectifier (SCR), which is a three-terminal solid state rectifier whose operation is usually triggered when a small control current passes between the two SCR gate and the anode. When the SCR is turned on, current can flow from anode to cathode. When the control current is removed, the SCR turns off and the current stops. The second major component of the SSR is the Optocoupler, usually a light-activated transistor (LAT) or an optically coupled isolator (optoisolator). The Optocoupler may be used to detect a control signal or as part of a feedback loop to ensure proper control.

There are two types of PAA132S available: zero-coasting: zero-crossing and random-coasting. The zero-crossing is a more reliable option since it will switch the connected load only when the voltage/amperage reaches zero, and this can drastically reduce the amount of EMI or noise generated. The random-coast type, however, is faster and generally more efficient since it does not rely on the voltage/amperage to reach zero first and hence reduces the time taken.

Conclusion

The PAA132S series of solid state relays is ideal for switching large loads at high temperatures. Its zero-crossing design reduces EMI and its dynamic saturation voltage ensures long-term stability. In addition, the two different types of SSRs (zero-crossing and random-coasting) allow for both improved reliability and faster switching times. The PAA132S series is a great option for those seeking a reliable and efficient solid state relay for industrial applications.

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