Siemens UL 489 - Main Terminal Connections

5 – 10
5.2 Main terminal connections
For main terminal dimensions of individual frame sizes, refer to:  Frame sizes / dimension drawings (page 7-1)
The main terminals and connectors are intended for busbar connection with NEMA hole patterns. The number and size of the busbars con-
nected to the circuit breaker must be selected per UL 891 in order to meet the design and test requirements according to UL 891 depending
on the rated current, defined by the rating plug. Different bussing in a given frame size may be applicable.
5.2.1 Cradle connections
1) The terminal permits the use of 2“ x ¼“ busbars.
2) The terminal permits the use of 4“ x ¼“ busbars.
5.2.2 Horizontal connections for fixed mount breakers
1) The terminal permits the use of 2“ x ¼“ busbars.
2) The terminal permits the use of 4“ x ¼“ busbars.
Drawout circuit breaker Connections to Line/Load side cradle connectors
Frame Size I
nmax
Number of available busbars
mounting positions
Busbar cross-section Number of holes
I 800 A / 1200 A 1 - 3 4“ x ¼“
1)
4
II
800 A / 1200 A / 1600 A 1 - 3
4“ x ¼“
1)
42000 A 2 - 4
2500 A / 3000 A 3 - 5
III 4000 A / 5000 A 5 - 7 5“ x ¼“
2)
6
NOTICE
Equipment Damage.
Cables which are connected directly to the horizontal bus terminals using cable terminals can damage the circuit breaker when
short-circuit currents occur.
Always connect mechanical cable lugs to front connected bus terminals ( Wire connectors (page 5-24)) or other type of properly braced
bus.
Fixed Mount circuit breaker Connections to Line/Load side horizontal terminals
Frame Size I
nmax
Number of available busbars
mounting positions
Busbar cross-section Number of holes
I 800 A / 1200 A 1 - 4 3“ x ¼“
1)
2
II
800 A / 1200 A / 1600 A
1 - 4 4“ x ¼“
1)
32000 A
2500 A / 3000 A
III 4000 A / 5000 A 2 - 6 5“ x ¼“
2)
4