CKRD4820EP

Solid State Relays are devices that turn on and off electric circuits on command. Traditionally, relay devices employ an electromagnet, and as such, have critical limitations in terms of size, power requirements and cost. But thanks to modern technology, Solid State Relays offer more advantages, such as smaller size, lower power requirements, and lower cost compared to the older electromechanical type relays. One of the Solid State Relays is CKRD4820EP.

The CKRD4820EP is a common low power solid state relay with a rating of 8A and a voltage of 48V. It can switch DC loads up to 48 volts at 8 amps. It has a switching speed of 40 msec, a life cycle of 100 million operations, and a power loss of less than 0.5W. It also features protective structure design, dust-proof design, and a wide operating temperature range of -55℃ ~ 125℃.

In terms of application field, CKRD4820EP is widely used in motor control, lighting, process control, and biomedical equipment, etc. It is especially suitable for DC motors and small pumps.

As for the working principle of CKRD4820EP, it functions an opto-isolator containing a field effect transistor (FET) providing switching of a load device, such as a DC motor or lamp. By applying a voltage to the input terminal, the LED inside the opto-isolator is turned on, thus activating the FET and switching the load. When the input voltage is removed, the FET is turned off and the load is disconnected. The CKRD4820EP is designed to have a low ON-resistance and low thermal resistance, making it suitable for high-current applications.

In conclusion, the CKRD4820EP is a suitable and reliable low power solid state relay being able to provide switch of DC loads. Its application field is wide including motor control, lighting, process control, and biomedical equipment. The working principle is by turning on and off led light, thus activating the FET and switching the load.