The Siemens 3RT1034-1BM40 is a SIRIUS power contactor in the S2 frame size, rated for 18.5 kW at 500 V AC-3 duty and 10 kW at 690 V. The IP20 front enclosure means the terminals are protected against finger contact in the panel, while the connection side is IP00 — standard for panel-mount contactors where the wiring compartment is enclosed by the cabinet.
At 400 V AC-2 (slip-ring motors), it is rated for 15 kW. Maximum operating rate is 1,000 operations per hour in AC-3, 250 in AC-4 — the lower figure reflects the heavier arc duty in reversing or jogging applications. Coil options: the 1BM40 variant carries a 220 V AC coil (50/60 Hz). Pickup voltage is 0.8 x rated (176 V), dropout below 0.55 x rated (121 V). The 24 V DC coil current is 10 A — this is the holding current, not the pickup surge. Wire range: solid conductors from 2x 0.5 mm² up to 2x 4 mm²; stranded up to 2x 25 mm².
Substance prohibitance (RoHS) compliance date is May 1, 2012 — the contactor meets RoHS and REACH requirements.
Width is 55 mm, height 112 mm, depth 130 mm. Side-by-side mounting is permitted — no gap required between contactors on the DIN rail, which saves panel width. The S2 frame is the standard size for this power band; it fits the same footprint as other SIRIUS S2 contactors and accessories (auxiliary contact blocks, surge suppressors, mechanical interlocks).