F&F DMA-3 CT TrueRMS, Manual

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1.  Switch off power supply.

2.  Install indicator on DIN rail.

3.  Connect the indicator according to the connection diagram:

4.  Connect the power supply of the indicator (230 V AC) to termi-

nals 5 and 6; connect the current transformer output to termi-

nals 1-7 (phase L1), 2-8 (phase L2), 3-9 (phase L3).

5.  Switch on the power supply.

If the secondary windings of the measuring transformers 

are open (e.g. during assembly) and a current flows thro-

ugh the measured circuit, a dangerous voltage may be 

induced at the terminals of the measuring transformer. 

It is absolutely necessary to protect oneself from such a 

situation by switching off the power supply of measured 

circuits or installing additional bridges short-circuiting 

the secondary side of a measuring transformer.

The indicator is designed for current measurement using 

current transformers with a rated output current of 5 A. 

Current flow through the measuring circuit of the indi-

cator of a value higher than 6 A may lead to damage of 

the indicator.

For increased safety, it is recommended that one side 

of the current transformer be earthed as shown in the 

connection diagram.

Mounting