Operating current and RCM measuring device UMG 20CM (Channel Meter) for DIN rail mounting Supply voltage 95V..240V (45-65Hz), 135V..340V DC, 4 voltage measuring inputs (LN: 10V-277Vrms, LL: 18V- 480Vrms, resolution 1V, 45Hz-65Hz), 20 current measuring inputs single-phase or three-phase, for measuring operating currents and RCM measurement Operating current (0-1 A, response current: 100 mA) 0 .. 600 A Connection via optional current transformers CT-6-20 700/1, CT20 700/1 and divisible current transformers STC20 3000/1 and differential current 1 .. 1000 mA (with load 16 A), resolution 1 mA Connection via optional residual current transformers CT-6-20 700/1 and CT 20 700/1Measurement in 1-phase / multi-phase networks 1 ph, 2 ph, 3 ph, 4 ph and 20 x 1 phNetworks: TN, TT, and ITMeasurement in single-phase 3-wire systems up to max. 220V-440VMeasurement in single-phase 2-wire systems up to max. 220VVoltage measurement, measurement category 300V CATIII2 digital outputsAcknowledgement function on the device Polarity reversal for current transformers 50Hz filter function for residual currents Data storage: 768 KB Flash (31 days for 15min currents, active power, active energy and voltage) Interface: RS485Protocol: Modbus Accessories:3303310 Operating instructions