The Schneider Electric A9MEM3250-NMI is an Acti9 iEM3250 electronic energy meter — a DIN-rail mounted, clip-on sub-metering device from the Acti9 iEM3000 series. It measures active energy, current, voltage, and active power for three-phase (3P, 3P+N) or single-phase (1P+N) circuits, with Class 0.5S accuracy on active energy per IEC 62053-22 and IEC 61557-12. Rated voltage covers 100...277 V (line-to-neutral) and 173...480 V (line-to-line), making it suitable for common low-voltage distribution in buildings, data centers, healthcare, and industrial sites. Current input is via external current transformers (CTs) rated 1 A or 5 A secondary.
Clip-on DIN-rail mounting (per IEC 60715), 10 x 9 mm pitch modules wide (90 mm), 95 mm tall, 69 mm deep. The form factor fits standard distribution board space — a 10-module-wide slot is common for meters. Screw terminals: 6 mm² for the current circuit, 2.5 mm² for voltage. IP40 on the front panel (finger-safe behind the door), IP20 on the body. Operating altitude below 3000 m, ambient storage from -40 to 85 °C, and 5–95% relative humidity at 50 °C.