I'm looking for a reasonably priced 'AC Current Switch' to attach to our (rural lifestyle block) water pump that is located in my workshop to monitor when it switches on/off and how long it has been running for.

Example: http://www.veris.com/Item/H609.aspx

Searches for these in NZ have not returned useful pricing results so far.

I currently use Global Cache 'iTach' products for much of my home/office automation and I/O control is handled by bash scripts or PHP that I write and run on my Linux servers. I also have a custom built text alert system to notify me of unusual events.

I can detect the status of low voltage relays or dry switches so a 'current switch' clipped over the 230V phase wire of the pump lead should give me a nice easy safe way to establish the on/off status of the pump without over the top I/O controllers.

Anyone have tips as to where I can get these AC Current Switches locally ?