HEIR444414R1 DCS

The ABB UN 0940a-P VAR.1 (HEIR444414R1) is an Angle Measure Transducer Module designed for ABB's SYNCHROTACT® 3 synchronization systems and UNITROL® excitation control platforms. This specialized module performs the critical angle measurement function required during generator synchronization, providing precise phase angle data to enable safe and accurate paralleling of synchronous generators with the electrical network. As a dedicated hardware component within ABB's synchronization and excitation architecture, it ensures reliable and deterministic angle measurement to facilitate bumpless circuit breaker closure during the synchronization process.