SIRIUS Size S00 — what the frame rating means for panel fit
The 3RT2018-1FB42 is a SIRIUS-branded power contactor in the Size S00 frame — the smallest in the SIRIUS contactor family, designed for motor loads up to around 7.5 kW at 400 V AC-3, though the exact rating depends on the specific coil and auxiliary configuration. Size S00 means the contactor occupies a 45 mm wide DIN-rail footprint, 58 mm tall, and 73 mm deep — a compact envelope that fits densely packed control panels where every millimeter of rail space is allocated. Mounting is via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, with the contactor body rotatable ±180° on a vertical surface and tiltable ±22.5° forward/backward — useful when the panel layout forces an unconventional orientation.
Coil and auxiliary contact ratings — what switches at what voltage
The magnet coil is rated 24 V DC with screw-type terminals, and the operating range spans 0.8× to 1.1× of the rated value — so the coil pulls in reliably between about 19.2 V and 26.4 V DC. An auxiliary switch is built in, rated for 10 A at 24 V DC, 2 A at 48 V and 60 V DC, 1 A at 110 V DC, 0.9 A at 125 V DC, and 0.3 A at 220 V DC — the current drops sharply as voltage rises due to DC arc extinction limits. At 400 V AC the auxiliary contacts are rated 3 A, and at 230 V AC the contactor is listed for 2 hp motor load — a direct cross-check for North American motor branch circuits.
Switching frequency and thermal limits — duty-cycle planning
Maximum switching rates are duty-dependent: 1,000 operations per hour in AC-1 (resistive), 750/h in AC-2 and AC-3 (motor starting/running), and 250/h in AC-4 (plugging/inching) — the AC-4 ceiling is the binding constraint for high-duty-cycle applications like crane controls. The contactor is rated for 30 million mechanical operations typical — a high endurance figure that suits applications with frequent cycling, such as conveyor indexing or HVAC staging. Operating temperature range is -25 °C to +60 °C, with storage from -55 °C to +80 °C — the -25 °C lower limit means the contactor is not rated for deep-freeze or unheated outdoor enclosures in cold climates without supplemental heating.
Wiring and clearance — what the terminal specs demand
Screw terminals accept solid or stranded conductors from 0.5 mm² to 4 mm², with dual-wire capability: 2 × (0.5...1.5 mm²), 2 × (0.75...2.5 mm²), or 2 × 4 mm² — useful for daisy-chaining control wiring without separate terminal blocks. Minimum clearance distances around the contactor are 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm at the sides — these are the free-air gaps needed for heat dissipation and arc quenching; crowding the contactor below these clearances derates the thermal capacity. Arcing time is 10 to 15 ms, and the DC operating time (coil pickup to main contact closure) is 38 to 65 ms — the spread matters for sequencing interlocks where contactors must close in a defined order.
Lifecycle and sourcing — current production, quoted to order
Sourced through independent distribution channels; availability and current pricing are confirmed at RFQ against the BOM quantity.