Siemens SIRIUS 3RT1054-2NF36 — Power Contactor, S6 Frame
The Siemens SIRIUS 3RT1054-2NF36 is a S6-size power contactor rated for switching motor loads in industrial control panels. It carries a 96-127 VAC coil and is fixed via screw mounting with a single 9 mm hole. The coil uses spring-type terminals for fast wiring, while the main power circuit accepts stranded conductors from 25 to 120 mm² — sized for the S6 frame's typical motor currents in the 100+ A range. Mounting position is flexible: the contactor can be rotated ±90° on a vertical surface or tilted ±22.5° forward/backward, which helps when fitting into tight enclosures alongside other SIRIUS gear. Operating temperature range is -25 to +60 °C, with storage tolerance from -55 to +80 °C, covering most indoor panel environments and warehouse conditions.
Switching Performance and Duty Ratings
The 3RT1054-2NF36 delivers consistent operating times of 80-90 ms on both AC and DC supplies, with an arcing time of 10-15 ms — important for coordinating with upstream protective devices in a motor branch circuit. Maximum switching frequency varies by duty class: 800 operations per hour under AC-1 (resistive loads), 1000 per hour under AC-3 (standard motor starting), and 130 per hour under AC-4 (plugging/reversing). The AC-3 rating is the one to size against for most conveyor, pump, and fan applications. Mechanical life is rated at 10 million operating cycles, reflecting the SIRIUS series' design for high-duty applications.
Auxiliary and Control Circuit Ratings
An auxiliary switch is built into the contactor. Its rated values span: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, and 1 A at 110 V — covering typical PLC output and relay interface voltages. The coil circuit accepts solid conductors of 2x 0.25-2.5 mm² via spring-cage terminals, matching standard control wiring practice.
Physical Dimensions and Clearance Requirements
The contactor measures 170 mm deep, 172 mm high, and 120 mm wide. Minimum clearances around the body: 10 mm upwards, 10 mm downwards, 10 mm at the sides, and 20 mm forwards — these are the air gaps needed for heat dissipation and arc flash containment.
Lifecycle and Sourcing Reality
For BOM freeze or second-source planning, the closest peer within the SIRIUS S6 range is the 3RT1054-2AP36, which shares the same frame size and mounting footprint but differs in coil voltage. The 3RT1054-1AB36 and 3RT1055-6QF35 are also S6-frame variants with different coil ratings or auxiliary configurations.