The 3RT2045-1NF34: The 83-155 VAC 50/60 Hz coil means it pulls in reliably across a sagging line — the dropout threshold is 0.8× rated, so on a 120 VAC control circuit it holds in down to about 96 V before the armature drops. Coil inrush peaks at 1.5 A, but the sealed holding draw is only 3.5 VA at both 50 and 60 Hz — the PLC output driving this contactor sees a brief surge then a light steady load. Mechanical life is rated 10 million operations typical — the limiting factor in a real panel is the electrical endurance under the specific duty cycle, not the mechanical count.
Wire range and terminal access — S3 frame
Main power terminals accept solid wire 2.5 to 16 mm² or stranded 6 to 70 mm² — the screw-type terminals handle the full range without lug adapters, but the larger stranded sizes need a ferrule for consistent torque.
Switching frequency and duty-cycle limits
Maximum switching rate depends on the duty category: 1 000 operations/hour in AC-3 and AC-3e, 900 in AC-1, 400 in AC-2, and 300 in AC-4 — the AC-4 limit is the binding constraint for reversing or plugging applications. Auxiliary switch block is included — the contactor ships with at least one built-in auxiliary contact, so you don't need a separate side-mount for basic feedback to the PLC.