We get this enquiry from customers running a 2-wire, 4-20mA transmitter out in the field who suddenly need that one signal to reach two different places — say a PLC for control and a separate chart recorder or annunciator panel for monitoring. Wiring the transmitter loop through two receivers in series isn’t good practice, and it doesn’t isolate anything, so noise or a fault on one side can affect the other.
The MTT MS3107 solves this properly. It powers the 2-wire transmitter directly (so no separate 24V DC supply is needed for the field device), then re-issues that 4-20mA reading as two completely independent, isolated DC outputs. Input, both outputs, and the power supply are all isolated from each other, so ground loops and common-mode noise don’t carry through from one connected system to another.
In actual application, panel power isn’t always 24V DC. The MS3107 accepts 100-240V AC mains, 24V DC, 12V DC, or 110V DC, so it can go into panels without a dedicated low-voltage bus. It can also be used purely as a dual-output isolator on an existing 4-20mA loop, without powering a transmitter at all, if that’s all you need.
Before we quote, we would normally check: whether you need the transmitter-powering function or just isolation and signal splitting, the output ranges needed on Output 1 and Output 2, the panel’s available power supply (AC or DC, and voltage), and DIN-rail space (it’s a compact 49.8mm wide unit). Send us these details and we can confirm the right variant before you order. Hope this helps.
| Input Signal | 4-20mA DC from 2-wire transmitter |
| Input Resistance | 250Ω |
| Transmitter Power Supply Output | 25V typical at 0% input, 18V typical at 100% input; 25mA max. transmitter current |
| Output 1 & 2 | Selectable current (0-20mA) or voltage (10mV-10V), independently configurable |
| Zero / Span Adjustment | Approx. ±5% of span each |
| Accuracy | Better than ±0.1% of span (at 25°C±5°C) |
| Response Time | 85ms max. (0 to 90%) |
| Temperature Effect | Better than ±0.2% of span per 10°C change |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Isolation | 4-way isolation between input, output 1, output 2, and power |
| Power Supply | 100-240V AC, 24V DC, 110V DC, or 12V DC |
| Power Consumption | 9.0VA (AC), 2.4W (24V DC), 3.5W (110V DC), 2.4W (12V DC) |
| Insulation Resistance | 100MΩ min. (@ 500V DC) |
| Dielectric Strength | 2000V AC for 1 minute |
| Enclosure / Mounting | ABS resin (UL 94V-0), DIN rail mounting, M3.5 screw terminal |
| Dimensions | W49.8 × H102.0 × D40.0 mm |
| Weight | 140g max. |
| Operating Temperature | -5 to 55°C, 5-90% RH non-condensing |
| Storage Temperature | -10 to 60°C |
Frequently Asked Questions
What is the MS3107 used for?
It powers a 2-wire, 4-20mA transmitter and converts that signal into two independent, isolated DC outputs, so one field transmitter can feed two separate systems — for example a control loop and a recorder or alarm.
Can the MS3107 be used with AC power instead of 24V DC?
Yes. The MS3107 accepts 100-240V AC, 24V DC, 12V DC, or 110V DC, so it can be powered directly from panels without a dedicated 24V DC supply.
What’s the difference between the MS3107 and the MS3007?
The MS3107 gives two independent isolated outputs from one transmitter input and can run on AC or DC power. The MS3007 is a single-output distributor powered only by 24V DC. Choose the MS3107 when the same transmitter signal needs to feed two separate devices, or when only AC mains power is available at the panel.
Does the MS3107 still power the transmitter, or is it just an isolator?
It does both — it can power a 2-wire transmitter directly, or be used purely as an isolator and signal splitter on an existing 4-20mA loop if the transmitter already has its own power source.
Download MTT MS3107 Terminal Block Type Distributor with Isolated Dual Output information here
Datasheet: MTT_SpecSheet_MS3107_Rev210_E
Manual: MTT_Manual_MS3107_Rev170_E
