DDR Series 18mm DIN Rail AC Digital Multi-Function Meter Voltage Current Frequency

Not every metering application requires energy consumption tracking. When the task is real-time monitoring of AC voltage, current, or frequency in a distribution cabinet — without the complexity of a full energy meter — the DDR series delivers exactly that in an ultra-slim 18mm DIN rail footprint. Five functional models let you specify precisely what the panel needs to display, from a 3-in-1 V+A+Hz combined meter to dedicated single-parameter instruments for voltage, current, or frequency. The bright red LED display is the defining feature of the DDR series — high-visibility digital readouts that remain easy to read in dim enclosures, industrial environments, and workshops where ambient light is limited. At 18mm wide and 81×66mm in profile, each unit occupies a single 1P DIN rail slot, making the DDR practical in crowded distribution boards where space is at a premium. The wide measurement range covers AC 80–500V voltage, 0–100A current, and 50/60Hz frequency — spanning single-phase and three-phase system monitoring. Measurement accuracy is ≤2% with a 1-sample-per-second refresh rate for stable real-time readings. The 3-channel current model is particularly useful for three-phase load balancing checks without a dedicated power analyzer. Rated insulation voltage 660V, IP20 protection, operating temperature range -50℃ to +55℃. Flame-retardant nylon housing, CE compliant. Note: not suitable for variable frequency drives, inverters, or high-harmonic environments.