Connection To The Power Circuit - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

Connection to the power circuit The connection of a circuit-breaker to the power circuit is performed using the connection busbars of the
287 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
electric switchgear fixed to the terminals of the circuit-breaker. The sizing of the busbars is specified by the
designer of the electrical switchgear.
IMPORTANT: before proceeding with the connection between terminals and connection
busbars:
• Make sure that the contact surfaces of the busbars are free of burrs, dents, traces of
rusting, dust or traces of grease.
• Make sure, if aluminium busbars are used, than they are tin plated in the contact areas.
• Make sure that the busbars do not exert forces in any direction on the terminal.
• Tightening: for E1.2 use M10 screws with resistance class 8.8 equipped with spring
washers and lock them with a torque of 45 Nm - 398.3 lb in
• Tightening: for E2.2-E4.2-E6.2 use M12 screws with resistance class 8.8 equipped with
spring washers and lock them with a torque of 70 Nm - 619.5 lb in
IMPORTANT: it is possible to obtain different capacities for the connections by altering
the thickness and number of busbars in parallel.
NOTE: the information on the performances of the circuit-breakers in switchboards is available
on the website:
http://new.abb.com/low-voltage/products/circuit-breakers/emax2.
The connection for the E1.2 circuit-breaker is shown below as swell as the tables with some examples of the
amount and sizes of the connections that can be used for each type of circuit-breaker:
Figure 96
circuit-breaker IEC 60947
E1.2
E1.2
E1.2
E1.2
E1.2
circuit-breaker UL 1066
E1.2-A
E1.2-A
Figure 97
Dimension of
Iu (A)
busbars (mm)
630 2x40x5
800 2x50x5
2x50x10
1000
2x50x8
2x50x10
1250
2x50x8
3x50x8
1600
2x50x10
Dimension of
Iu (A)
busbars (inches)
1x1/4x3
800
2x1/4x2
2x1/4x2
1200
3x1/4x2
ABB | SACE Emax 2
Horizontal Vertical
terminals terminals
yes yes
yes yes
yes -
- yes
yes -
- yes
yes -
- yes
Horizontal Vertical
terminals terminals
- yes
yes -
- yes
yes -
Continued on the next page
Mechanical accessories | 7 - Installation