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My parts list/tender specifications
ER/U1.1 Electronic Relay, 1-fold, FM
Product is not offered in Germany.
Data Sheet:
Variant overview
The device is used in combination with the universal interface US/U x.2 and a room thermostat to control the temperature in individual rooms. The thermal valve drives of the radiator valves are operated both noisefree and with a low rate of wear.