D1D40LK

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Solid State Relays (SSR) are devices used to control electric circuits without significantly using mechanical parts. The SSRs provide isolation between input and output circuits, and can be controlled directly by signals from different types of sensors and systems. Among the various types of SSRs, the D1D40LK model is a digital SSR, particularly suited for industrial automation and T&C (Testing & Control) applications, such as electric motors, lighting, heating and air conditioning, process control, power systems, etc.

The D1D40LK digital circuit is based on MOSFET (Metal Oxide Semiconductor Field Effect Transistor) technology and programmed by means of digital signal inputs. The device contains a Zener diode, with a high noise immunity, for the front protection against transient overvoltage. Its output is built with a pair of anti-parallel MOSFET devices that are driven separately depending on the logic level input and provide zero-crossing switch-over, for improved performance and reliability.

The main features of the D1D40LK device are: input frequency range from 4 Hz to 1 KHz, input control currents of 5mA to 10mA, output voltage up to 24V DC, and an operating temperature range of -20°C to +70°C. It is available in several forms, such as DIN-mount, surface mount, and plug-in types, and has a wide range of applications.

The working principle of the D1D40LK digital SSR is quite simple but effective. As the name suggests, the device utilizes a digital signal to switch on and off. The digital signal provides the control to the two semiconductor devices on the output. Depending on the input level, the output current will either remain the same or change the switching state.

When the output is off, no current is discharged from the output terminal while the input is still connected. This ensures a totally turn-off operation. On the other hand, when the output is switched on, the device charges the output terminal with current flow and the switch is open. The output is effectively controlled by the input signals.

The D1D40LK digital SSR also offers low power consumption and high switching speed. The switching time ranges from 4 ms to 8 ms depending on the type of application. As opposed to other mechanical based relays, SSRs have the advantages of having a higher switching frequency, non-contact isolation, higher reliability, and longer life expectancy.

The D1D40LK digital SSR is widely used in industrial applications. It can be used to control electric motors, lighting, heating and air conditioning systems, process control systems, and to provide surge protection. It is also suitable for T&C applications. The device can provide zero-crossing switchover for improved performance and reliability, and its wide input voltage and frequency range makes it suitable for a range of applications. It is also highly resistant to interference thanks to its Zener diode, making it an ideal choice for industrial applications.

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