Electrical Connections; Power Circuit Connections; Shapes Of The Terminals; Examples Of Connection Busbar Layouts Depending On The Types Of Terminals - ABB Tmax T8 L5757 Instructions For Installation And Service

5.

Electrical connections

5.1

Power circuit connections

Use insulated bars/ perform specifi c type tests on the installation.
5.1.1

Shapes of the terminals

F
Front terminals
(IEC/UL)
Fig. 9
Note
The drawings provide a schematic illustration of the type of terminal. The exact shape of the terminals is given in the chapter entitled "Overall
dimensions". The terminals installed on the upper and lower parts (input and output) can be different from each other.

5.1.2. Examples of connection busbar layouts depending on the types of terminals

The busbars allow connections to be made between the terminals of the circuit-breaker and the busbars of the switchboard. They must be ac-
curately sized by the switchboard design engineer.
This section illustrates examples of possible constructions, depending on the shape and size of the circuit-breaker terminals.
It is normally advisable to use the entire contact surface of the terminal, thus the width of the busbar should be the same as that of the terminal.
Different capacities can be obtained for the connections by adjusting the thickness and number of busbars in parallel. In certain cases, reductions
in the width of the connection in relation to that of the terminal can be allowed, as shown in the examples below.
Circuit-breaker Iu [A]
T8 V 1600
T8 L-V 2000
T8 L-V 2500
T8 V 3000
T8 L-V 3200
Fig. 10
Mod. L3692
L3885
ES
Adjustable rear termi-
Extended front
nals for fl at bar ( VR for
terminals (IEC)
IEC/UL; HR for IEC)
Front terminals
Busbar cross-section
2 2
[mm ]/[in ]
3x(100x5) / 3x(3.94x0.2)
3x(100x5) / 3x(3.94x0.2)
4x(100x5) / 4x(3.94x0.2)
-
-
L5757
VR/HR
Vertical rear ter-
minals (IEC)
3x(100x5) / 3x(3.94x0.2)
3x(100x5) / 3x(3.94x0.2)
4x(100x5) / 4x(3.94x0.2)
6x(100x5) / 6x(3.94x0.2)
6x(100x5) / 6x(3.94x0.2)
Apparatus
Doc N°
VR VR
Vertical rear
terminals (UL)
Vertical rear terminals
Busbar cross-section
2 2
[mm ]/[in ]
Tmax T8
1SDH000682R0002
Scale
Page N°
7/39