What it is and what it does
The Siemens SIRIUS 3RT1015-1AP01-ZX95 is a size S00 power contactor rated for switching resistive and light inductive loads up to 10 A at 24 V AC-12 duty, making it the go-to for control transformers, heater banks, and general-purpose on/off in a panel. Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022, so it drops into any standard control cabinet without adapter plates. AC-3 motor switching capability is 3 kW at 400 V and 4 kW at 690 V, meaning it handles a 4-pole induction motor up to that power on a 400 V three-phase line. For DC load switching, the contactor is rated 10 A at 24 V, 2 A at 60 V, and 0.3 A at 220 V — the inductive DC curve collapses fast as voltage rises, so watch the load type.
Sourcing and lifecycle reality
The -ZX95 suffix indicates a customer-specific variant; verify that the base ratings match your BOM before committing. The standard 3RT1015-1AP01 shares the same electrical core.
What the ratings mean for fit
The 10 A AC-12 rating at 24 V means this contactor is sized for control-circuit loads, not heavy motor starts — AC-3 motor duty is limited to 3 kW at 400 V. For a 4 kW motor at 690 V, the next frame up (S0, e.g. 3RT1023) would be the correct call. Pollution degree 3 qualifies it for industrial environments where conductive dust or condensation may be present, but the IP20 front and terminal protection means it must live inside a sealed enclosure — no washdown exposure. The 30 million mechanical cycles typical endurance means this contactor will outlast the panel in most cyclic applications — it's not the limiting component in a conveyor or pump start circuit.
Integration and wiring notes
Screw terminals on the main current circuit accept 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or max 2x (0.75...4 mm²) solid/stranded — the 4 mm² max is for a single conductor only, so plan your ring terminals accordingly. Type 2 coordination (no damage to the contactor under short circuit) requires a gL/gG fuse rated 20 A; Type 1 coordination (contactor may need replacement after fault) allows a 35 A fuse. For critical circuits, spec the 20 A fuse and keep the panel selective. Side-by-side mounting is permitted with 6 mm clearance at the side, so multiple contactors can pack tightly on the DIN rail without derating — useful for multi-motor groups in a compact MCC bucket. Operating temperature range of -25 to +60 °C covers most indoor panel conditions, but the 2000 m maximum altitude limit means derating is needed above that — not an issue for sea-level plants but relevant for high-altitude installations.