CLASS 10 trip and S0 frame — what they mean for motor protection
The 3RA2120-1HA24-0AK6: Rated for AC-3 switching duty up to 690 V, this direct starter handles the inrush of squirrel-cage motors without welding the main contacts — the contactor inside is a 3RT2024-1AK60, paired with the link module 3RA2921-1AA00.
Power ratings across common supply voltages
At 400 V, the unit is rated for 3 000 W (3 kW) motor output; at 480 V it delivers 7.92 A; at 600 V it delivers 6.33 A — the current drops as voltage rises because the motor power rating is fixed for the frame. Horsepower ratings span 1 hp at 230 V up to 5 hp at 460/480 V and 575/600 V — this covers the common North American motor voltages in a single device. The 110 V and 120 V control coil options (50/60 Hz) let the same unit work across 50 Hz and 60 Hz supply regions without a coil change.
Mounting and panel integration
The backwards clearance is 0 mm — the unit can sit flush against the back panel or against adjacent devices on the same rail. Operating temperature range is -20 to +60 °C, storage and transport range is -50 to +80 °C — suitable for unheated warehouses and truck transport in temperate climates.
Lifecycle and compliance — active production, RoHS dated
Degree of pollution 3 means the device is rated for conductive pollution environments (condensation, occasional conductive dust) — typical for industrial control panels not in clean-room conditions.