Siemens Landis & Staefa Nruf a Bms Controller Ac dc 15 45v, Supply Ac 24v Transmission Transformer Compact and Efficient Design: The 40703 Compact and Efficient Design: The SAG21's compact design makes it easy to integrate into existing systems managing the smooth functioning in electrical networks and avoiding overloads or short circuits • Copper Conductor Wiring: Needs 22–14 AWG copper conductors for excellent electrical performance Attribute Value Brand Siemens Landis & Staefa Model NRUF A Category Building Technologies Power Supply AC 24V Frequency 50 60 Hz Power Consumption 20 VA Operating Temperature T 45°C Analog Output DC 0