Integrator's note on the SIRIUS 3RT1035-1AP08-0MA0-ZX95
The Siemens SIRIUS 3RT1035-1AP08-0MA0-ZX95 is a power contactor in the S2 frame size, rated for motor switching at 18.5 kW at 400 V in AC-2 duty (slip-ring motors, reversing starts) and 35 A in AC-4 (plugging, inching). Screw-type terminals on the main circuit accept up to 2x 25 mm² stranded, and the control circuit takes solid conductors up to 4 mm² — a practical range for panel wiring up to the contactor's full rating. Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022; side-by-side mounting is permitted, which saves rail space in dense MCC or control panels.
Electrical ratings and what they mean for fit
The 18.5 kW AC-2 rating at 400 V is the key selection figure: it governs switching of wound-rotor motors with moderate inrush — common on crane, hoist, and conveyor drives. The AC-4 rating of 35 A covers the higher arc stress of plugging and inching cycles. For DC switching, the contactor handles 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — a useful capability for DC brake coils or control circuits in the same panel. Rated operational power at higher voltages: 22 kW at 500 V and 11.4 kW at 690 V, extending its use to 690 V line supplies common in heavy industrial and mining installations.
Lifecycle and compliance
The part carries a RoHS substance prohibition date of 05/01/2012, indicating compliance with the EU RoHS directive. Pollution degree 3 (industrial environment with conductive pollution) is the rated ambient condition.
Physical integration and environmental limits
Dimensions: 55 mm wide, 112 mm high, 164 mm deep — the S2 frame footprint fits standard 55 mm-wide contactor slots in MCC buckets and control panels. Operating temperature range -25 to +60 °C; storage from -55 to +80 °C. The IP20 front enclosure protects against finger contact; terminal area is IP00, so live parts are exposed — standard for panel-mounted contactors. Maximum mechanical switching frequency: 10 million cycles typical. Electrical endurance varies by duty: 1,200 cycles/hour at AC-1, 1,000 at AC-3, 600 at AC-2, and 300 at AC-4.