Compact motor starting with integrated protection
The Siemens 3RA6120-1EB33 is a SIRIUS compact starter combining a contactor and overload relay in a single 45 mm wide housing — a direct starter design per IEC 60947-6-2 for continuous operation. The adjustable trip class (Class 10 or 20) lets the overload curve match the motor start profile — Class 10 for fast-starting pumps and fans, Class 20 for high-inertia loads like conveyors or centrifuges.
Control voltage and wiring
Control voltage is 24 V AC/DC (24 V at 50 Hz, 24 V at 60 Hz, 24 V DC), which means a single 24 V supply rail powers the coil regardless of line frequency — simplifies panel wiring where mixed-frequency sites are common. Power dissipation is 3.5 W AC maximum and 3.1 W DC maximum — the thermal load on the enclosure is modest, but the 45 mm width means adjacent starters should be spaced per the derating guidelines in the product manual to stay within the -20 to +60 °C operating range.
Mounting and environmental ratings
Mounts on standard 35 mm DIN rail via screw and snap-on fastening; the 45 x 170 x 165 mm (W x H x D) footprint fits a 6-module-wide slot in most distribution boards. Shock resistance tested at 60 m/s² (6g) with 10 ms pulses, 3 shocks per axis; vibration resistance per f=4-5.8 Hz at 15 mm amplitude and f=5.8-500 Hz at 20 m/s² for 10 cycles — meets the mechanical endurance requirements for machine-mounted applications.
Lifecycle and sourcing
No stock-holding claim — availability is verified per inquiry.