Main Terminal Connections; Cradle Connections; Horizontal Connections For Fixed Mount Breakers - Siemens UL 489 Operating Instructions Manual

5.2

Main terminal connections

For main terminal dimensions of individual frame sizes, refer to:
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

Drawout circuit breaker
Frame Size
I 800 A / 1200 A
800 A / 1200 A / 1600 A
II
2500 A / 3000 A
III 4000 A / 5000 A
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

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
bus.
Fixed Mount circuit breaker
Frame Size
I 800 A / 1200 A
800 A / 1200 A / 1600 A
II
2500 A / 3000 A
III 4000 A / 5000 A
1) The terminal permits the use of 2" x ¼" busbars.
2) The terminal permits the use of 4" x ¼" busbars.
Number of available busbars
I
nmax
mounting positions
2000 A
Number of available busbars
I
nmax
mounting positions
2000 A
 Frame sizes / dimension drawings (page 7-1)
Connections to Line/Load side cradle connectors
Busbar cross-section
1 - 3
1 - 3
2 - 4
3 - 5
5 - 7
NOTICE
( Wire connectors (page
Connections to Line/Load side horizontal terminals
Busbar cross-section
1 - 4
1 - 4
2 - 6
Number of holes
1)
4" x ¼"
1)
4" x ¼"
2)
5" x ¼"
5-24)) or other type of properly braced
Number of holes
1)
3" x ¼"
1)
4" x ¼"
2)
5" x ¼"
4
4
6
2
3
4
5 – 10