SSR-240D25

Series:	SSR
Packaging:	Bulk
Part Status:	Active
Mounting Type:	Chassis Mount
Circuit:	SPST-NO (1 Form A)
Output Type:	AC, Zero Cross
Voltage - Input:	3 ~ 32VDC
Voltage - Load:	24V ~ 280V
Load Current:	25A
Termination Style:	Screw Terminal
Package / Case:	Hockey Puck
Supplier Device Package:	--

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Solid State Relays

SSR-240D25 application field and working principle

Solid state relays, (or SSRs) as they are more commonly known, are electrical switches which operate in a similar manner to electromechanical relays, but which employ solid state components like transistors and opto-couplers for switching instead of electromechanical components. Their primary uses are in digital and communication systems, industrial automation, and industrial process control.The SSR-240D25 is one such device, optimized for use in these and other fields. It is optimal for controlling either AC or DC voltage, and can be used specifically for switching high current and voltage applications.

Working Principle

The SSR-240D25 operates by employing an opto-coupler which separates the input side control circuit from the output side switching circuit. This means the control circuit is isolated from the switching circuit, affording an additional level of safety. The output side of the device is a triac-based switching circuit. This means it contains a semiconductor element with two terminals. One receives a gate voltage, which triggers the turn-on and turn-off actions of the device. It also contains two resistors connected to a zero-cross voltage detection circuit. When AC voltage is applied to the SSR-240D25\'s terminals, once it detects the zero-cross voltage, it turns-on and off in accordance with the gate voltage instructions.The SSR-240D25, and any other SSR for that matter, usually possess three basic components: an input circuit, an output circuit, and a driver circuit. In this particular device, the input circuit is an opto-coupler, and the output circuit is the triac-based switching circuit. The driver circuit is the gate voltage trigger that is responsible for the turn-on and turn-off of the SSR-240D25.

Typical applications

As already discussed, the SSR-240D25 is designed for precisely controlling AC or DC voltage with high current and voltage applications. This opens the device up to a range of potential applications.In terms of typical applications, the SSR-240D25 can be used in configurations such as remote control, industrial process control, temperature controllers, liquid level control, and automation systems.

Conclusion

In conclusion, the SSR-240D25 is a solid state relay which is optimal for controlling AC or DC voltage with high current and voltage applications. Its unique construction provides additional safety, and makes it particularly well-suited for use in industries such as industrial process control, remote control, temperature controllers, liquid level control, and automation systems.The primary advantage of using a solid state relay as opposed to an electromechanical relay is its greater simplicity and speed, and its ability to switch over a much wider range of current and voltage.

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