The 3RT2028-2XB40-0LA2: The 24 V DC coil with spring-type terminals eliminates the need for screwdriver torque control on the coil wiring — the spring clamp holds the conductor under constant pressure, resistant to vibration loosening. Rated for 5 hp at 230 V motor duty, this contactor handles typical pump, fan, and conveyor applications within the S0 frame's current envelope.
Coil circuit and auxiliary contact ratings
Dropout time at DC is 30 to 50 ms, which matters for sequencing logic where the contactor must release before a downstream device engages. These are the make/break capacities for the auxiliary contacts — the PLC input or relay it drives must be rated to handle the switched current at the applied voltage.
Wiring and panel integration
The spring-type terminals on both coil and main circuits mean no screw-torque verification — strip, insert, and the clamp engages.
Switching frequency and thermal limits
Maximum switching rate is 750 operations per hour in AC-1, AC-2, AC-3, and AC-3e duty, dropping to 250 ops/h in AC-4 (plugging/inching). For a conveyor running at 30 starts per hour, this is well within margin; for a rapid-cycling application like a press control, the AC-4 limit governs the duty cycle.