The Siemens 3RT1066-2NP36 is a SIRIUS S10-frame power contactor rated for a 200-277 V AC coil. The dropout threshold is 0.8 × rated value. The S10 frame size handles the main power circuit through stranded terminals accepting 70-240 mm² — that is a heavy cable range suited for motor feeders in the 100-200 A class. The control circuit uses spring-type terminals (2× 0.25-2.5 mm² solid or stranded), so you can land the coil wires without a screwdriver. Mounting is screw fixing on a vertical surface, rotatable ±90° and tiltable ±22.5° front-to-back, which gives panel builders flexibility in tight enclosures. Clearance distances: 10 mm upwards, downwards, and to the side; 20 mm forwards — plan your DIN-rail or backplate layout accordingly.
Duty-cycle capability and switching frequency
Switching frequency is duty-dependent: 750 cycles/hour in AC-1 (resistive loads), 500 in AC-3 and AC-3e (squirrel-cage motors, normal starting), 250 in AC-2 (slip-ring motors), and 130 in AC-4 (plugging/inching). For a conveyor drive running AC-3 duty at 500 ops/h, that is one start every 7.2 seconds — adequate for most material-handling lines.
Auxiliary contact ratings and timing
The auxiliary switch is rated 10 A at 24 V, 2 A at 48 V and 60 V, and 1 A at 110 V — these are the maximum continuous currents the aux contacts can break. Use them for PLC inputs or small relay coils; watch the voltage derating above 24 V. Arcing time is 10-15 ms. That gives you a predictable dropout sequence for interlocking circuits.
Environmental range and lifecycle
For a critical spare holding on a legacy SIRIUS install, this part is still in the active catalog. No official successor has been published, so the 3RT1066-2NP36 is the direct replacement for itself — no cross-reference guesswork needed.
As a Siemens SIRIUS product, the contactor carries the manufacturer's standard compliance documentation. Specific certificate copies are available on request with the RFQ.