Energy Measurement and Management
Terminal block for direct connected meters
The terminal block for direct connected meters contains current terminals, auxiliary terminals and potential links
for power supply of the voltage metering circuitry.
Terminal block of direct connected meters
1. Current terminals
3. Auxiliary voltage terminals for an add-on unit
2. Auxiliary terminals 4. Terminal cover opening detector
The 85 A terminal blocks has only one screw per current terminal, while 120 A terminal blocks has
two screws per current terminal. Due to indirect pressure to the conductors the terminal screws do not
damage it. The current terminals make a reliable and durable contact regardless if the conductor is made of
copper or aluminium.
Voltage metering elements are power supplied via potential links. Sliding potential links are self- braking and
enable easy disconnection of current and voltage metering circuitry. In the metering mode they should be
in their lowest position (closed contact), and in the meter testing mode they should be in their highest
position (opened contact). On request, the potential links can be located under the meter cover.
2
1. Sliding potential links
(opened contacts)
1
3
2. Phase voltage test
contacts
3. Terminals of auxiliary voltages
Potential links in the terminal block
