MTT MS3120 Terminal Block Type CT Transmitter

The MTT MS3120 terminal block CT transmitter reads the AC current from a current transformer, calculates its true RMS value, and delivers it as two independent, isolated DC outputs from a single unit — useful when a current reading needs to reach both a control system and a separate recorder or alarm. True RMS calculation keeps the reading accurate on non-sinusoidal current waveforms, which is common on loads driven by variable-frequency drives.

A choice of AC or DC power lets it fit panels without a dedicated low-voltage supply, and full isolation between input, both outputs, and power keeps the transmitter safely separated from the monitored circuit while delivering clean signals to every connected device. The DIN-rail housing mounts directly in the panel where the CT wiring lands.

It is a practical way to distribute one motor or load current reading to two separate monitoring or control systems without dedicated power-metering hardware.

Input Current Range0-1A AC or 0-5A AC, 50/60Hz
Allowable Continuous Input120% of rated value
Allowable Instantaneous Input10× rated value (within 3 seconds)
Crest Factor3 max.
Output 1 & 2Current (0-20mA, 4-20mA) or voltage (0-10mV to ±10V ranges), independently configurable
AccuracyBetter than ±0.25% of span with at least 10% input (at 25°C±5°C)
Temperature EffectBetter than ±0.2% of span per 10°C change
Response Time400ms max. (0 to 90%)
CMRR100dB min. (500V AC, 50/60Hz)
Power Supply100-240V AC, 24V DC (±10%), or 110V DC
Power Consumption6.5VA (AC), 1.6W (24V DC), 2.5W (110V DC)
Isolation5-way isolation between input, output 1, output 2, power, and ground
Insulation Resistance100MΩ min. (@ 500V DC)
Dielectric Strength2000V AC input/outputs; 500V AC between outputs
Enclosure / MountingABS resin (UL 94V-0), DIN rail mounting, M3.5 screw terminal
DimensionsW49.8 × H102.0 × D40.0 mm
Weight140g (main unit), 5g (shunt resistor)
Operating Temperature-5 to 55°C, 5-90% RH non-condensing
Storage Temperature-10 to 60°C
StandardsEMC Directive 2014/30/EU, Low Voltage Directive 2014/35/EU, Installation Category II

Download MTT MS3120 Terminal Block Type CT Transmitter information here

Datasheet: MTT_SpecSheet_MS3120_Rev19_E

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