230V AC 50 Hz. To protect costly equipments from AC line over voltage under voltage , I would like to choose a product which is highly reliable. Regarding this I came across Furman products which are quite popular in audio engineering industry. I need your advice on this or similar products

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There are many manufacturers who make separate relays for each function like UV,OV,unbalance,UI, OS, US etc etc as well single multifunction relay for over/under voltage,phase failure/unbalance etc. Browse catalogs/websites.

hager Electro Co. produce a rang of Protection Relays for single phase load protection against " Over & Under Voltage ", noting that these 2 levels can be " Fixe or Adjustable " and the rang is " EU ... "

You may choose from the combined OVER & UNDER VOLTAGE Protection Relays, that are available in many reputable manufacturers' range.

Most of the equipments that need to be protected are stacked in 19' Instrument rack. These racks are movable to different places. AC power cords are connected to utility mains at different places. Because of Neutral wire opening at Point of common connection many of the equipments have seen OV. Due to this I am looking for OV/UV protection which is 19' rack mountable.