The Siemens 7KM3220-1BA01-1EA0 is a SENTRON PAC3220 energy monitor with a 24-60 V DC auxiliary supply — the DC-powered variant of the PAC3220 platform. It shares the same core measurement engine, dual Ethernet Modbus TCP interface, graphical LCD, and IP65 front panel as the AC/DC-supplied 0BA01 variant, differentiated solely by its DC supply voltage range optimized for battery-backed and DC control power applications.

DC Supply for Specialized Applications

The 24-60 V DC supply range targets installations where the control power is DC: telecom central offices (-48 V DC plants), battery-backed monitoring systems, railway signaling power supplies, and industrial DC control panels. In these environments, the 1BA01 variant eliminates the need for a separate AC/DC power supply module dedicated to the energy monitor — it connects directly to the existing DC bus.

Same PAC3220 Core Capability

Beyond the supply voltage, the 1BA01 delivers the same measurement performance as the 0BA01: Class 0.5 active energy accuracy, ±0.2% voltage and current measurement, TRMS sensing, harmonic-capable measurement engine, dual Ethernet with Modbus TCP, and expandability via plug-in modules. The choice between 0BA01 and 1BA01 is purely about what control voltage is available in the panel.

Decision Parameters