SIRIUS S0 power contactor — 3RT1526-1AM20
The Siemens 3RT1526-1AM20 is a SIRIUS S0 power contactor, rated 25 A per NO and NC contact, with a 208 V 50/60 Hz coil.
The 25 A per contact rating applies to both NO and NC contacts — that is the thermal continuous current (Ith) for the main poles. For motor switching (AC-3 duty), the actual motor current rating will be lower; the datasheet should be consulted for the specific AC-3 value. The coil draws 8.4 VA at 50 Hz and 0.24 A at 60 Hz (the 0.24 figure is likely inrush or holding current at 60 Hz — the unit is A, not VA). Switching capacity varies with voltage: at 24 V DC it switches 10 A, at 60 V DC 2 A, at 110 V DC 1 A, at 220 V DC 0.3 A. For AC loads at 230 V it switches 6 A, at 400 V 3 A, at 440 V 1 A. These are the maximum resistive (AC-1) or DC switching values — inductive loads will require derating. Maximum altitude is 2000 m without derating. Maximum switching frequency at AC-1 is 1000 operations per hour.
Side-by-side mounting is permitted with zero clearance between units — no additional spacing needed. The mounting position allows vertical surface mounting with +/-180° rotation and +/-30° tilt front-to-back. Side clearance of 6 mm is specified for arc-chamber venting. Dimensions: 85 mm height, 61 mm width, 91 mm depth. The S0 frame size is compact for a 25 A contactor — fits standard panel layouts. Conductor cross-section accepted: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²) for solid/stranded wire. Screw terminals are standard for the main circuit.