The synchronous clocks have no backup power reserves, are suitable surface mounting and possess 2 switch discs: A 24 hour disc for starting the defrosting process and a 60 min disc for the defrosting duration. FRI 77 h has one switch contact, FRI 77 g has two switch contacts (electrically separated), one of which is a night time running switch. Types: FRI 77: Housing for wall mounting, with transparent cover FRI 77-2: Drive without housing with quick mounting system for profile rails (35 mm, DIN EN 50 022), can be mounted horizontally or vertically
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