Sourcing this SIRIUS S0 contactor
The Siemens 3RT2027-1BB40-ZX95 is a SIRIUS power contactor in the compact S0 frame, built for switching motor loads and resistive circuits in control panels up to 400 V. The 24 V DC coil pulls in at 80% of rated voltage and holds reliably across the -25 to +60 °C operating range. Screw-type terminals accept solid or stranded wire from 1 to 10 mm² — standard for panel wiring without special tooling.
What the ratings mean for fit
The 10 A rating at 24 V DC is the contactor's switching capacity under resistive load — this is the number that governs whether it handles your solenoid or small motor branch. For AC motor duty, the main contacts are rated for AC-3 at 750 operations per hour and AC-4 at 250 cycles per hour, so it's sized for moderate-speed starting and plugging, not high-cycle servo applications. The S0 frame (85 mm high, 45 mm wide, 107 mm deep) snaps onto standard 35 mm DIN rail per EN 60715, with ±180° rotation on vertical surfaces and ±22.5° tilt — useful when panel layout forces an unconventional orientation. Clearance distances are tight: 10 mm upwards and forwards, 6 mm at the sides. That means you can cluster these contactors on the rail without the wide gaps some older frames demand — good for density, but verify arc-flash boundaries if you're paralleling high-rupturing-capacity devices upstream.
Lifecycle and sourcing reality
This part carries a current-production lifecycle status. It is sourced through independent distribution channels and quoted to order against an RFQ — availability and current pricing are confirmed at quote time. No official successor has been published, so the 3RT2027-1BB40-ZX95 is the active BOM line for new builds and MRO spares alike.
Panel integration notes
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The auxiliary switch is built in (yes on the spec line), so you don't need a separate add-on block for status feedback to the PLC. Terminal capacity of 1 to 10 mm² solid or stranded covers most control-circuit wiring; for daisy-chaining multiple contactors, the 2x (0.75 to 2.5 mm²) stranded rating handles parallel feeds.