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http://www.mouser.sg/ProductDetail/Omron-Automation-and-Safety/PS-5S/?qs=NA0XKeglvRUyagP8IhFnnQ==
https://www.digikey.sg/product-detail/en/omron-automation-and-safety/PS-5S/Z6272-ND/1813294
http://www.monotaro.sg/g/00187308/
http://www.monotaro.sg/p/02500066/
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