The STA-W module is an interface designed for the exchange of heat quantity measurement values between RESOL devices and external appliances. It can be connected to a RESOL controller or a calorimeter via the VBus. Whenever the heat quantity increases by 1 kWh, the module operates a potential-free contact which is connected to the central building management system. The total number of operated contacts can be visualised as heat quantity by the software of the central building management system. Outputs: 1 potential-free relay (max. 24 V DC, 1 A, 15 W) Power supply: RESOL VBus Data interface: RESOL VBus Housing: plastic, PC-ABS and PMMA Mounting: wall mounting Indication/Display: 1 LED Ambient temperature: 0 ... 40 °C Dimensions: Ø 130 mm, depth 45 mm Max. frequency: 5 Hz Protection type: Protection type: IP 20, with insulation IP 22 IEC 60529