Technical Instructions OpenAir GEB Series Enhanced Rotary Non-Spring Return Damper Actuators
Document Number A6V12029156
December 16, 2021
Page 12 Siemens Industry, Inc.
All wiring must conform to NEC and local codes and regulations.
Use earth ground isolating step-down Class 2 transformers. Do not use autotransformers.
The maximum rating for a Class 2 step-down transformer is 100 VA. Determine the supply transformer
rating by summing the VA ratings of all actuators and all other components used. It is recommended
that one transformer power no more than 10 actuators (or 80% of its VA).
WARNING:
Mixed switch operation is not permitted to the switching outputs of both auxiliary switches
(A and B).
Either all six outputs of the dual auxiliary switches must be connected to the AC line
voltage, or all six outputs must be connected to UL-Class 2 voltage (SELV for CE
conformance).
NOTE: With Plenum cables only UL-Class 2 voltage (SELV for CE conformance) is
permitted.
WARNINGS:
Installations requiring Conformance:
• Except for the auxiliary switches (See Warning above) all wiring for actuators must
be safety extra-low voltage (SELV) or protective extra-low voltage (PELV) per
HD384.
• Use safety transformers per EN61558 with double isolation, designed for 100%
duty-cycle for supplying SELV or PELV circuits.
• Over-current protection for supply lines is maximum 10A.
CAUTION:
Do not parallel GEB13x actuators with any other type of actuator.
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