The Siemens 3RT2036-1NF30 is a SIRIUS S2 frame power contactor — the main power switching element in a motor control centre or panel. The 55 mm width and 130 mm depth define the panel slot it occupies; the 114 mm height plus 10 mm clearance above and below means it fits a standard 200 mm tall enclosure section with room for wiring ducts.
Coil voltage and control-circuit draw
The coil is rated 83... 155 V — covers 110-120 V and 127 V nominal taps. Inrush current peaks at 1.5 A; holding power is 2 VA at both 50 and 60 Hz.