ABB SACE Emax 2 Series Operating Instructions Manual page 174
Low voltage air circuit-breaker
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Connection to the power
171 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
A circuit-breaker is connected to the power circuit using the connection busbars of the switchboard fixed
circuit
to the circuit-breaker terminals.
Emax 2 circuit-breakers are tested in accordance with standards IEC 60947.2-3 and UL 1066.
The switchboard designer is responsible for busbar sizing, which must be validated by application of the
tests provided for by the pertinent standards.
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 110
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 111
Dimension of busbars (mm)
Iu (A)
Horizontal terminals
630
2x40x5
800
2x50x5
1000
2x50x10
1250
2x50x10
1600
3x50x8
Dimension of busbars (inches)
Iu (A)
Horizontal terminals
800
2x1/4x2
1200
3x1/4x2
ABB | SACE Emax 2
Vertical terminals
2x40x5
2x50x5
2x50x8
2x50x8
2x50x10
Vertical terminals
1x1/4x3
2x1/4x2
Continued on the next page
Mechanical characteristics
3 - Installation
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