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I read this thread, but I cannot confirm.

RUT240 Digital input/output, Characteristic wiki shows "digital input is non-isolated". But it is not clear if digital output is isolated or not.

Optical isolate is important to prevent electrical accident between RUT240 and other outside device. 

1 Answer

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Hi,

There is no isolating circuit related to digital output, so no, it's NOT isolated.

EB.
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Thank you for your reply.

As this comment and schematic picture, digital output of RUT955 is optically isolated.

But the digital output of RUT240 is not isolated.

Is it right ?

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Yes, you're right. RUT955 digital output is optically isolated, and RUT240 is not

EB.
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Is there a wiring diagram for typical use of digital input to monitor a switch contact?