Switching frequency and duty class — what the numbers mean
The 3RT2024-1AN60 is rated for 1 000 switching cycles per hour under AC-1, AC-2, and AC-3 duty, and 300 cycles per hour under AC-4. AC-3 is the standard motor-switching category (starting and disconnecting a running squirrel-cage motor); AC-4 covers plugging and inching, which stresses the contacts harder. If your application involves frequent reversing or jogging, the AC-4 limit of 300 1/h is the governing number — not the higher AC-3 figure.
Auxiliary contact capacity across voltages
The built-in auxiliary switch breaks 10 A at 24 V rated value, 2 A at 48 V and 60 V, 1 A at 110 V, and 0.3 A at 220 V. At 400 V rated value it handles 3 A. These are the contact ratings for the auxiliary circuit — they define what control loads (PLC inputs, indicator lamps, contactor coils) the auxiliary contacts can switch directly without an interposing relay.
The Size S0 footprint (85 mm height, 45 mm width, 97 mm depth) fits standard 35 mm DIN rail enclosures. Solid or stranded wire accepted: 1... 10 mm² for main contacts, 2x (0.5... 1.5 mm²) or 2x (0.75... 2.5 mm²) for the coil and auxiliary circuit.