What This Part Is and Where It Fits
The Siemens SIRIUS 3RT2023-1CC20 is a size S0 power contactor with a 24 VDC magnet coil, screw-type terminals, and an integrated auxiliary switch. It mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 60715, making it a direct fit for standard industrial control panels. Its compact footprint — 45 mm wide, 85 mm high, 97 mm deep — leaves room for adjacent devices in a crowded enclosure. The auxiliary contact block is built in, saving a separate add-on slot.
Key Ratings and What They Mean for Your Application
Rated for AC-3 switching at up to 1000 operating cycles per hour, this contactor handles motor loads in start-run duty without overheating the coil or main contacts. The AC-4 rating drops to 300 cycles/h, reflecting the heavier arc wear during reversing or inching. The auxiliary contacts are rated at 10 A at 24 V, 3 A at 400 V, and 0.3 A at 220 V — covering typical PLC-level signals and small relay loads. The arcing time is held to 10 ms, which helps with contactor-coordination in safety circuits. Operating temperature spans -25 to +60 °C, with storage from -55 to +80 °C. That covers most indoor panel environments and unheated warehouses.
Mounting and Wiring Notes
The main circuit accepts solid or stranded conductors from 1 to 10 mm²; auxiliary terminals accept two conductors per clamp (0.5 to 2.5 mm²). The screw-type terminals are standard for panel builders — no special tooling required. Clearance spacing: 10 mm above and below, 6 mm to the side. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when the contactor sits on a swing-out panel.