The MTT MS3004 is a terminal block type high-level signal conditioner (isolator) that takes a DC current or voltage input and converts it into a standard, isolated DC output. It accepts DC current from 100µA to 200mA, or DC voltage from 200mV to 600V, covering most high-level signal sources found on a panel.
Output is configurable to DC current (4~20mA, 0~20mA) or DC voltage (10mV to 20V), so it can match what your PLC or DCS accepts. Zero and span are each adjustable by ±2.5% of span, with accuracy better than ±0.1% of span at 25°C±5°C and temperature effect of ±0.2% of span per 10°C change. Standard response time is 85ms max (0-90%); a /K option brings this down to 10ms max for faster processes.
There is 3-way isolation between input, output, and power, with CMRR of 100dB min (500V AC, 50/60Hz) and insulation resistance of 100MΩ min at 500V DC – this is what breaks ground loops and keeps electrical noise from corrupting your reading. Dielectric strength is 1500V AC for 1 minute.
Power supply is 24V DC (±10%) or 12V DC (±20%), drawing up to 40mA (24V) or 70mA (12V). The unit mounts on DIN rail with M3.5 screw terminals, in an ABS resin (UL 94V-0) enclosure measuring W25.0 × H94.0 × D40.0mm and weighing under 90g.
| Input Types | DC current (100µA to 200mA) or DC voltage (200mV to 600V) |
| Input Resistance | 1MΩ min. (voltage), 10-250Ω depending on range (current) |
| Allowable Input | 30V DC max. / 40mA DC max., continuous |
| Output Types | DC current (4-20mA, 0-20mA) or DC voltage (10mV to 20V) |
| Zero / Span Adjustment | ±2.5% of span each |
| Accuracy | Better than ±0.1% of span (at 25°C±5°C) |
| Temperature Effect | ±0.2% of span per 10°C change |
| Response Time | 85ms max. (0-90%); 10ms max. with /K option |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Power Supply | 24V DC (±10%) or 12V DC (±20%) |
| Power Consumption | 40mA max. (24V current out), 70mA max. (12V current out) |
| Isolation | 3-way isolation between input, output, and power |
| Insulation Resistance | 100MΩ min. (@ 500V DC) |
| Dielectric Strength | 1500V AC for 1 minute |
| Enclosure / Mounting | ABS resin (UL 94V-0), DIN rail mounting, M3.5 screw terminal |
| Dimensions | W25.0 × H94.0 × D40.0 mm |
| Weight | 90g max. |
| Operating Temperature | -5 to 55°C, 5-90% RH non-condensing |
| Storage Temperature | -10 to 60°C |
| Standards | EMC Directive 2014/30/EU, EN61326-1:2013; Low Voltage Directive 2014/35/EU, IEC/EN61010-1:2010 |
Frequently asked questions
What is the MS3004 used for?
It converts and isolates a DC current or voltage signal, so you can split, repeat, or protect a 4 to 20mA or voltage loop without disturbing the original instrument reading.
Can the MS3004 be used to split an existing 4 to 20mA loop?
Yes, that’s one of its most common uses. Because the input, output, and power are all isolated, adding the MS3004 doesn’t load down or disturb the original loop.
What’s the difference between the MS3004 and the MS3044?
The MS3004 has a standard response time of 85ms (10ms with the /K fast-response option), while the MS3044 is built specifically for fast-response applications, with a response time of 70 microseconds. If your loop needs very fast signal tracking, the MS3044 is the better fit.
Does the MS3004 need a separate power supply?
Yes, it runs on 24V DC or 12V DC and is not loop-powered.
Download MTT MS3004 Terminal Block Type High-Level Signal Conditioner (Isolator) information here
Datasheet: MTT MS3004 Spec Sheet (PDF)
Manual: MTT MS3000 Series User’s Manual (PDF)
