CD4850E4UH

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Solid State Relays

Solid State Relays (SSRs) are relay-like switching devices that utilize solid state circuitry to automatically switch a load on or off in response to applied control signals. When the control circuit is activated, a low controlled voltage, typically 3-32V DC or 10-220V AC, is switched on, and when the control circuit is inactive, the relay is switched off. Compared to traditional electromechanical relays (EMRs) such as contactors and motor starter relays, SSRs offer the advantage of higher switching capacities, better control accuracy, faster control response, greater life expectancy, and easier installation.

CD4850E4UH Application Field and Working Principle

The CD4850E4UH is one of the most extensively used Solid State Relays on the market, designed to power a wide range of devices such as resistive load like incandescent lamps, gas discharge lamps, kettles and other heaters, as well as small motors. It features a 4KT temperature compensated AC coil with Zero voltage turn-on/off function and an AC/DC input control, with the opto-coupler as an isolation power switch.

In operation, when the AC signal is fed into the input control, a pulse width modulation (PWM) signal is generated that drives the internal optical light coupling elements. This optical signal is then sent to the output power contacts. The power contacts are closed to allow the load to begin to receive power. By regulating the threshold voltage as well as the on-off state to be proportional to the input control signals, the CD4850E4UH can maintain a predetermined, desired operating level, making it even more ideal for home appliance and automotive applications.

It is also designed for the highest of safety standards. As a key feature, the CD4850E4UH input has an over-voltage protection circuit, designed to work as a preventative measure to prevent the device from carelessly running at a dangerously high input voltage. The device also incorporates a Zero-voltage turn-on/off circuit, ensuring safe operation of opto-coupled circuits without the need for the Zero-crossing voltage.

Due to its extensive features, the CD4850E4UH makes an excellent choice for a wide range of applications, from home appliance to industrial control. It provides a great fit for the majority of small SSRs in high power applications, and its high input and output ratings make it ideal for large AC loads such as heaters and motors.

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