Siemens SIRIUS 3RT2037-1SB30 — S2 Power Contactor, 21-33 V Coil
The S2 frame carries screw-type terminals for the main and auxiliary circuits.
Coil and Switching Performance
The coil draws 2 VA at both 50 Hz and 60 Hz, with an inrush current peak of 2.2 A. Maximum mechanical operating frequency varies by duty: 800 1/h at AC-1, 400 1/h at AC-2, 700 1/h at AC-3, and 200 1/h at AC-4. The AC-3e rating matches the AC-3 maximum at 700 1/h. Typical mechanical service life is 5,000,000 operations.
Wiring and Panel Fit
Screw-type terminals accept 2x (0.5-1.5 mm²) solid or stranded, or 2x (0.75-2.5 mm²). Dimensions are 55 mm width, 114 mm height, 130 mm depth — the S2 frame fits standard 35 mm DIN rail enclosures. The contactor's auxiliary contact ratings cover 24 V (10 A), 48 V (2 A), 60 V (2 A), 110 V (1 A), and 125 V (0.9 A).
No official successor has been announced for this active S2 frame contactor. For BOM freeze or second-source planning, the closest functional peer is the smaller S0 frame 3RT2015-1BW42, but verify panel cutout and terminal capacity before substitution — the S2 frame offers higher switching frequency and larger conductor accommodation.