Siemens SENTRON 3WL10 Series Manual page 120

Application planning
4.2 Power supply, grounding, and connection
Means of connection, cables
Connections of the fixed breaker version
Circular conductor terminal,
adapter 4x240
The following applies to connecting bars to horizontally / vertically orientable rear terminals
for main circuit connection:
Rated uninterrupted current I
[A]
630
800
1000
1250
Grounding
The fixed circuit breaker does not require grounding.
For the withdrawable breaker, two alternatives are possible to achieve continuity and
equipotentiality of the grounding between the circuit breaker and the protection circuit of the
switchboard:
● Connection of the guide frame to the protection circuit with a cable in accordance with
IEC 61439-1, Section 10.5.2
● If a conductive connection between the guide frame and the grounding of the switchboard
is ensured via the metal base (floor mounting) or the metal wall (wall mounting) of the
switchboard panel, no additional grounding is required. This means there must be no
insulation material between the circuit breaker and the grounded metal of the switchboard
panel.
118
Busbar dimensions
u
2 x 40 x 5
2 x 50 x 5
2 x 50 x 10
2 x 50 x 8
2 x 50 x 10
2 x 50 x 8
A ∅
[mm] [mm]
30 21.5
Horizontally oriented
rear terminals
●
●
●
—
●
—
Manual, 11/2017, L1V30499596002-01
A ∅
[mm ]
2
120 to 240
Vertically oriented
rear terminals
●
●
—
●
—
●
Air circuit breaker 3WL10