AS-Interface reversing starter for motor control
The Siemens 3RK4320-3PQ51-1BA2 is a SIRIUS reversing motor starter designed for AS-Interface networks, combining a contactor, overload relay, and communication interface in one enclosure. The AS-Interface protocol is supported, with 2 digital inputs for local control signals, and the control supply is 20.4–26.4 V DC.
Panel fit and mounting flexibility
Dimensions are 205 mm depth, 245 mm width, and 215 mm height — the depth is the critical clearance behind the panel door for wiring and heat dissipation. IP54 rating means the unit is protected against dust ingress and splashing water — suitable for installation in control cabinets on factory floors where occasional washdown occurs.
Motor protection and brake output
A motor brake output is built into the product, allowing direct control of a holding brake without an external relay — saves panel space and wiring. Short-circuit protection is integrated via circuit-breakers, and the operating frequency is rated for 80 operations per hour at 50/60 Hz.