Page 172 - Sace Emax 2 Manual for design engineers
P. 172
ABB | SACE Emax 2
Connection to the power circuit The connection of a circuit-breaker to the power circuit is performed using the connection busbars of the
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 109 Figure 110
Dimension of busbars (mm)
circuit-breaker IEC 60947 Iu (A)
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
Dimension of busbars (inches)
circuit-breaker UL 1066 Iu (A)
Horizontal terminals Vertical terminals
E1.2-A 800 2x1/4x2 1x1/4x3
E1.2-A 1200 3x1/4x2 2x1/4x2
Continued on the next page
170 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Mechanical characteristics | 4 - Installation
