What It Is and Where It Fits
The Siemens 3RT2024-2BB44-ZX95 is a SIRIUS power contactor in the S0 frame size, designed for switching motor loads in industrial control panels. It mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 60715, so it integrates directly into a standard panel layout without adapters. The coil is rated 24 VDC, drawing 6 A at that rated value — a key figure for sizing the control transformer or DC power supply feeding the panel. Main contact termination uses spring-type terminals, accepting solid or stranded wire from 1 to 10 mm², with dual-wire capacity for 2x (0.5 to 2.5 mm²). This speeds wiring compared to screw clamps, especially on repetitive builds.
Key Ratings and What They Mean for Your Panel
Operating temperature range is -25 to +60 °C during operation, with storage from -55 to +80 °C. That covers most indoor industrial environments; if the panel sits near a furnace or in a non-conditioned warehouse, verify the ambient stays under the 60 °C ceiling. Switching frequency is rated at 1,000 operating cycles per hour for AC-1, AC-2, AC-3, and AC-3e duty, dropping to 300 cycles per hour for AC-4. For high-cycling applications like rapid reversing or jogging, the AC-4 limit is the binding constraint. Mechanical life is typical 10,000,000 operations — the contactor itself will outlast most application cycles if the electrical load stays within the rated utilization category. Mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/-22.5°. This helps when the DIN rail is oriented unusually or the panel layout is tight.
Clearance and Wiring Details
Physical dimensions: 102 mm height, 45 mm width, 154 mm depth. The 45 mm width is the standard S0 footprint — it occupies one 45 mm slot on the DIN rail. Required clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. These are the minimum air gaps for heat dissipation and arc containment; crowding the contactor against cable ducts or other devices risks derating. Arcing time is 10 to 10 ms — a tight band, meaning the arc extinguishes quickly, which helps with contact life and reduces EMI in the panel. This variant has no auxiliary switch block (Auxiliary Switch: No). If your circuit needs feedback or status signaling, you will need to add a separate auxiliary contact block that fits the S0 frame.
Lifecycle and Sourcing Reality
Because it is a current-production part, sourcing is straightforward: quoted to order against an RFQ. The paperwork — CE, RoHS, REACH, and manufacturer declarations — is standard for a Siemens SIRIUS contactor and can be provided with the shipment.