The reversing contactor assemblies are suitable for use in any climate and have mechanical interlocking. They are finger-safe according to IEC 60529.

Complete units and components are available for customer assembly. For motor protection, overload relays for stand-alone installation or thermistor motor protection evaluation units must be ordered separately.

Complete units

The 3TD68 reversing contactor assemblies each consist of two 3TF68 vacuum contactors that are mechanically interlocked with 3TX7686-1A. The electrical interlocking is wired. Main and control circuits are wired according to the circuit diagrams.

An internal circuit diagram, a type designation and unit labelling plate are provided on a common cover.

Auxiliary contacts

The reversing contactor assemblies have 4 NO + 4 NC contacts per individual contactor. 3 NO + 3 NC contacts are unassigned for momentary-contact operation and 4 NO + 3 NC contacts unassigned for continuous contacting.

For the wiring of the individual contactors, see the circuit diagrams of the control circuits in the reference manual "Switching Devices - Contactors and Contactor Assemblies", https://support.industry.siemens.com/cs/ww/en/view/35554359.