SIRIUS S00 power contactor, 24 VDC coil — panel fit and duty ratings
The Siemens 3RT2017-1BP42 is a SIRIUS S00 power contactor with a 24 VDC magnet coil terminated at screw-type terminals and an integrated auxiliary switch. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715 — the standard panel rail across European and global control cabinets. The S00 frame size keeps it compact at 45 mm wide, 58 mm tall, and 73 mm deep, so it fits tight sub-panel layouts without crowding adjacent devices. Rated for continuous operation in ambient temperatures from -25 °C to +60 °C, with storage tolerance from -55 °C to +80 °C. The mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward or backward — useful when the contactor sits in a slanted or tight enclosure where straight vertical isn't possible. The main contacts carry the load for switching motor and resistive circuits. The contactor's size S00 rating covers the 20 A to 12 A range for main contacts, and the auxiliary switch handles DC breaking at various voltages: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. That DC auxiliary rating matters when switching DC control circuits or small DC loads downstream of a PLC output.
Duty-cycle and switching frequency
Switching frequency depends on the load type. At AC-1 (resistive) the contactor handles up to 1,000 operations per hour. For AC-2 (slip-ring motors) and AC-3 (squirrel-cage motors) the limit is 750 ops/h. At AC-4 (plugging/reversing/inching) it drops to 250 ops/h — the harsher the duty, the more thermal recovery time the contactor needs between cycles. The arcing time sits between 10 ms and 15 ms, and the DC coil dropout delay is 7 ms to 13 ms.
Wiring and clearances
The screw terminals accept solid or stranded copper: 0.5 mm² to 4 mm² for single conductors, or two conductors per terminal (2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm²). Minimum clearance to adjacent components: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm to the side. That clearance is tight enough for dense panels, but the 10 mm vertical gap must be respected for arc-quenching and heat dissipation.