Unused Siemens Sirus soft start / control voltage is 110v ac but through use of relays / transformers, can be controlled from any existing switched control circuit. The model number is 3RW4425-1BC34 should you wish to look up the details. If you have any questions then feel free to contact me. The item "Siemens sirus Softstarter / softstart / soft starter 3RW44251BC34" is in sale since Saturday, May 11, 2019. This item is in the category "Business, Office & Industrial\Industrial Automation & Motion Controls\Drives & Starters\Drives & Motor Controls\Other Motor Controls". The seller is "bobbieslandy" and is located in Chelmsford. This item can be shipped to United Kingdom.