The MTT MS3064 is a terminal block type loop-powered isolator that breaks a 4~20mA DC signal loop into two isolated circuits, without needing any external power supply of its own – it draws what it needs from the loop. Maximum allowable input current is 30mA DC.
Output is 4~20mA DC or 1~5V DC, with a maximum load of 50kΩ min for voltage output, or 50-350Ω range (350Ω max) for current output. Accuracy is better than ±0.1% of span, with temperature coefficient better than ±0.15% per 10°C change and response time of 15ms max (0 to 90%). CMRR is 100dB min (500V AC, 50/60Hz).
There is 2-way isolation between input and output, with insulation resistance of 100MΩ min at 500V DC and dielectric strength of 1500V AC for 1 minute – this breaks ground loops between the transmitter side and the receiving PLC or recorder side without adding a separate power feed.
The unit mounts on DIN rail with M3.5 screw terminals, measuring W25.0 × H94.0 × D40.0mm and weighing under 70g. It is rated for -5 to 55°C operation (5-90% RH non-condensing) and -10 to 60°C storage.
| Input Signal | 4-20mA DC |
| Maximum Allowable Input Current | 30mA DC max. |
| Output Signal | 4-20mA DC or 1-5V DC |
| Maximum Load | 50kΩ min. (voltage output), 350Ω max. (current output, 50-350Ω range) |
| Accuracy | Better than ±0.1% of span |
| Temperature Coefficient | Better than ±0.15% per 10°C change |
| Response Time | 15ms max. (0 to 90%) |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Isolation | 2-way isolation between input and output (loop-powered, no external supply needed) |
| Insulation Resistance | 100MΩ min. (@ 500V DC) |
| Dielectric Strength | 1500V AC for 1 minute |
| Enclosure / Mounting | DIN rail mounting, M3.5 screw terminal |
| Dimensions | W25.0 × H94.0 × D40.0 mm |
| Weight | 70g max. |
| Operating Temperature | -5 to 55°C, 5-90% RH non-condensing |
| Storage Temperature | -10 to 60°C |
Frequently asked questions
What is the MS3064 used for?
It isolates a single 4 to 20mA loop between a transmitter and a PLC or recorder, eliminating ground loops and blocking common-mode noise, without needing its own power supply.
Does the MS3064 need a separate power supply?
No, that’s what makes it different from most other isolators in this series. It draws all the power it needs from the current loop itself, so there are no power terminals to wire in.
Does adding the MS3064 affect the loop’s voltage budget?
Yes, like any loop-powered device it adds a small voltage drop to the loop, so it’s worth checking your transmitter’s available voltage headroom before adding it, especially on loops that are already running close to their limit.
Can the MS3064 output a voltage signal instead of 4 to 20mA?
Yes, the output can be configured as 4 to 20mA current or 1 to 5V voltage, depending on what your receiving instrument needs.
Download MTT MS3064 Terminal Block Type Loop-Powered Isolator information here
Datasheet: MTT MS3064 Spec Sheet (PDF)
Manual: MTT MS3000 Series User’s Manual (PDF)
