Siemens SIRIUS 3RT2037-1SB30 — S2 Power Contactor, 21-33 V Coil
Rated for a 52 a MTBF, this contactor is sized for panel integration on 35 mm DIN rail per DIN EN 60715, with screw and snap-on mounting. The S2 frame carries screw-type terminals for the main and auxiliary circuits. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C. The mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward.
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. Switching times are 30-55 ms for both AC and DC operation, with an arcing time of 10-20 ms. 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. The contactor includes an auxiliary switch and supports 18-1 main contact configuration.
Wiring and Panel Fit
Screw-type terminals accept 2x (0.5-1.5 mm²) solid or stranded, or 2x (0.75-2.5 mm²). Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. 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).
Sourcing and Lifecycle
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.