Devices for temperature control of cabinets, DIN rail mounted.
(blue adjusting screw) = with normally open contact. It can be used to signal temperature alarms or to control ventilation systems.
(red adjusting screw) = with normally closed contact. It can be used both as an alarm signal and to control heating or anti-condensation resistors.
to be electrically powered, it differs from the previous ones as it has exchange contacts, a very low intervention differential or hysteresis