501

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Staco 501C is an open-frame, panel-mountable variable autotransformer (Variac), whereas the Staco 501KN is essentially the exact same transformer unit but pre-packaged with a Knob and Nameplate dial for manual bench or panel mounting.Both models share identical electrical specifications, but they differ in their out-of-the-box physical hardware configurations:Key DifferencesStaco 501C: This is the base core assembly model. It is an "open" version designed primarily for enclosure integration or OEM applications. It features an adjustable/reversible shaft but does not include the decorative front nameplate or the control knob as standard kit packaging.Staco 501KN: The "KN" suffix explicitly denotes Knob and Nameplate. It is packaged with the reference dial plate (graduated 0–100 or 0–140) and a large manual adjustment dial knob, making it ready for immediate benchtop placement or front-panel manual operation.Shared Electrical SpecificationsBecause the internal transformer structure is identical, both units feature:Input Voltage: 120V AC (Single Phase, 50/60 Hz).Output Voltage: 0–120V AC, or 0–140V AC when wired for over-voltage "boost" mode.Current Rating: 5 Amps maximum for constant current loads (7 Amps for constant impedance).Capacity: 0.70 kVA.Terminals: Standard combination Faston / screw terminal structures Show more