The DC power is connected to a terminal stripe marked POWER in the lower right-hand corner of the motherboard. The three terminals are marked 31/+, 32/− and 33/(protective earth). The power terminal is directly connected to the exposed metal parts of the indicating transmitter DTR. Fuse voltage should be min. 48 V DC, max. size 4 A and fuse speed fast. Ensure that the protective fuse in the building system complies with local requirements.
The 24 V DC power to this terminal stripe must be supplied from a secondary circuit which is double or reinforced insulated from the mains supply within the limits for a limited-energy circuit (maximum 200 VA/U) according to the IEC 61010-1.