The K3MAJA2100240AC is a K3MA-J Series digital process display — a panel-mount indicator that reads DC voltage from -10 to 10 V and DC current from 0 to 20 mA on a 5-digit LCD with 14.2 mm character height. It runs on 100 to 240 VAC, so it taps directly into the control transformer without needing a separate 24 VDC power supply — one less rail to maintain in the panel. The panel cut-out is 95 mm wide by 45 mm high, with a mounting depth of 85 mm — standard 1/8 DIN footprint, meaning it drops into existing cut-outs without panel rework.
The voltage input spans -10 to 10 VDC — bipolar, so it handles both positive and negative process signals like a pressure transmitter's 0-10 V output or a temperature transmitter's -10 to +10 V scaled signal. The current input is 0 to 20 mA, covering the standard 4-20 mA loop — the 0 mA floor means it also reads 0-20 mA transmitters, not just the live-zero type. The 5-digit display at 14.2 mm gives readable resolution for process values like 0.0000 to 9.9999, useful when you need to see millivolt or microamp changes on a furnace profile or flow signal.