Never connect inductive loads (contactors, solenoids) without proper snubber circuits. The RWF40 relays are rated for 2A resistive; inductive loads will weld the contacts.
: Includes three analog inputs for boiler temperature (Pt100, Ni100), external setpoints, and outside temperature (weather-dependent shifting). siemens rwf40 manual
If you work with industrial boilers, you’ve likely held the Siemens RWF40 universal controller in your hand. It’s the gray box that stands between a cold facility and a functioning plant. But if you’re like most technicians, you only open the manual when something goes wrong—or when you need to remember a parameter code for the hundredth time. Never connect inductive loads (contactors