SIRIUS Size S0 contactor with 12 V DC coil
The 3RT2327-1BA40: The 12 V DC coil with screw-type terminals suits applications where a low-voltage DC control circuit is already present — common in PLC-driven panels or battery-backed safety systems.
DC switching capability across voltage levels
The non-linear drop reflects DC arc extinction physics: higher voltage arcs sustain longer, so the contact gap and arc chute limit the current at elevated voltages. The 12 V DC coil draws a pickup current with a dropout ratio of 0.8 and a full-scale value of 1.1 — meaning the contactor picks up reliably at 80% of rated voltage and drops out at 110% of rated voltage, giving a clean hysteresis band for control logic. Switching times are specified: DC operate time 15 to 18 ms, arcing time 10 ms. These numbers matter when coordinating with upstream fuse or breaker curves — the arcing time sets the minimum fault-clearing window the contactor can survive without contact welding.
Panel fit and mounting flexibility
The Size S0 frame (85 mm height, 60 mm width, 107 mm depth) fits standard 8-module enclosure widths. This accommodates tight enclosures where the contactor must be oriented to clear busbars or wiring ducts. These are minimum air gaps to adjacent metalwork or other devices — critical for maintaining rated insulation and avoiding flashover in humid environments.
Wiring and auxiliary contact provisions
Stranded wire range: 1 to 10 mm². The screw-type terminals with cage clamps handle the full range without ferrules for solid wire, but stranded wire benefits from bootlace ferrules to prevent strand fan-out. The storage range covers most warehouse conditions; the operating range suits unheated plant floors but not freezer applications below -25 °C.
This means the 3RT2327-1BA40 is available through standard Siemens distribution channels and carries full manufacturer warranty and support. Sourced to order against BOM quantities. No stock-holding claim; each order is verified against the manufacturer's current production schedule.