What this contactor is and where it fits
The Siemens 3RT1346-1AN60 is a SIRIUS power contactor, size S3, built for switching motor loads in industrial control panels. Its 53 kW rating at 230 V 60 °C tells you it can handle a 53 kW motor under those conditions — the real-world thermal limit at elevated ambient. The insulation voltage is rated 1 000 V, giving headroom for 400 V and 690 V systems. Screw-type terminals for the main current circuit accept stranded conductors up to 2x 50 mm², which is typical for this frame size. Mounting is screw and snap-on onto 35 mm and 75 mm standard mounting rail — a clean DIN-rail integration. Side-by-side mounting is allowed, so you can pack multiple contactors in a row without spacing gaps. The front carries IP20 protection; the terminal area is IP00, so panel builders need to account for that in the enclosure design.
Key ratings and what they mean for selection
The 53 kW at 230 V 60 °C is the motor-switching capacity under continuous duty at elevated ambient — if your panel runs cooler, you get headroom. The contactor also carries rated operational currents for resistive loads: at AC-1 maximum it can handle 1 000 switching cycles per hour. For DC switching, the 24 V rated value is 10 A, dropping to 0.3 A at 220 V — typical for a power contactor, not a DC relay. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Pollution degree 3 means it's rated for industrial environments with conductive pollution — no extra conformal coating needed for most panel conditions. The mechanical life is typical 10 000 000 operations, which is standard for this class.
Termination and wiring
Main circuit terminals accept solid conductors: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²), and stranded: 2x (10... 50 mm²). At 40 °C the minimum permissible conductor is 50 mm²; at 60 °C it derates to 35 mm². AWG cables for main contacts are 2x (10... 1/0). The arcing time is 10... 15 ms, and the at AC operating time is 10... 25 ms — both within expected ranges for a power contactor.