Transfer element. Interface, RSSD, SUB-D plug according to IEC 807-2 / DIN 41652, 37-pin plug, tension clamp connection. Passive interfaces for signal transmission of a SubD connector equipped with tension spring technology in accordance with IEC 807-2 / DIN 41652. The most important features are: group with 9-, 15-, 37- and 50-pole plug and socket connectors. Electrical connection one to one between control and field connections. Extremely compact modules for mounting on standard mounting rail TS 35 or TS 32.