What the ratings mean for fit
The 3UG5716-2CR20: The 90–690 V AC supply range covers standard low-voltage networks (400 V, 480 V, 690 V) without a separate control transformer. Frequency monitoring is fixed to 15–70 Hz, so it works on 50 Hz and 60 Hz systems but also on variable-frequency gensets or low-frequency shipboard supplies. The Bluetooth interface is not a control bus — it is a commissioning and diagnostic tool; the relay still trips hardwired contacts. Spring-loaded terminals accept 0.2–2.5 mm² with ferrule; strip length 8 mm. The 38 mm housing width fits one standard DIN-rail module.
Lifecycle and compliance
The 3UG5716-2CR20 is an active, current-production item. RoHS compliance effective 01 June 2023; REACH Article 33 disclosure notes lead (CAS 7439-92-1) above 0.1% w/w. Export classification is AL: N / ECCN: EAR99 — no special license required for most destinations. Group Code R711 and Product Group 5885 are internal Siemens cataloging fields; they do not affect fit or function.