Hi: I am a uk manufacturer of galvanic isolators 70 amps rated & supplied with or without status monitor : Our website is www.galvanicisolators.com :may i suggest you look at our helpfiles & I'm sure you will find valuable information within: please note : we construct & test our isolators to a very high standard not easily attained by d.i.y. projectors. heat sinking is vital & quality of components must be a1. isolators are a safety device & must be treated with great respect!I hope the website is of help to you ..Regards ..Vic..If You need further advice please email