Rated 8 A at 400 V AC-3 — motor switching capacity and protection
The 3RK4320-3MQ54-0BA2: The same 8 A rating applies at AC at 400 V for general resistive or mixed loads. The main current circuit has 3 poles, and short-circuit protection is designed for coordination with circuit-breakers. Operating voltage range is 340-440 V at 50/60 Hz. The minimum operating frequency of 80 operations per hour sets the switching rate limit for cyclic applications — exceeding this shortens the electromechanical contact life.
DC control supply and AS-Interface integration
Control supply voltage is 20.4-26.4 V DC, making this starter compatible with standard 24 V DC control systems. The AS-Interface protocol is supported (bus communication enabled), so it integrates directly into an AS-i network without a separate gateway module for the motor starter function. Two digital inputs are onboard for local sensor feedback or command signals. A motor brake output component is included, but brake control options are absent for 24 V DC, 180 V DC, 400 V AC, and 500 V DC — confirm brake wiring requirements separately if the application uses a brake motor.
IP54 enclosure and mounting flexibility
Dimensions are 205 mm depth, 245 mm width, 215 mm height. Duty rates per SN 31920 are 50% for low-demand and 75% for high-demand cycles — relevant for sizing the starter in applications with frequent starts.
Compliance and substance prohibitance
The reference code per IEC 81346-2 is Q (power switching device).