ABB | SACE Emax 2
Mechanical characteristics
3 - Installation
171 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
Connection to the power
circuit
A circuit-breaker is connected to the power circuit using the connection busbars of the switchboard fixed
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 Figure 111
circuit-breaker IEC
60947
Iu (A)
Dimension of busbars (mm)
Horizontal terminals Vertical terminals
E1.2 630 2x40x5 2x40x5
E1.2 800 2x50x5 2x50x5
E1.2 1000 2x50x10 2x50x8
E1.2 1250 2x50x10 2x50x8
E1.2 1600 3x50x8 2x50x10
circuit-breaker UL 1066 Iu (A)
Dimension of busbars (inches)
Horizontal terminals Vertical terminals
E1.2-A 800 2x1/4x2 1x1/4x3
E1.2-A 1200 3x1/4x2 2x1/4x2
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