CIRCUTOR OPTIM HYB Series - Manual (Page 28)

5.2.2. TIGHTENING TORQUE OF THE ELECTRICAL CONNECTIONS
The connections must be tight.
The torques of the circuit breakers are indicated in Table 4 and Table 5.
Table 4:Torques of power cables to unipolar and three-pole circuit breakers.
Circuit breaker Torque (Nm)
In ≤ 3 x 63 A 2
In ≤ 2 x 63 A 2
Table 5:Torques of cables to connector terminals
Model Auxiliary (Nm) Power (Nm)
MC -12 1.3 1.6
MC -18 1.3 2.2
MC -32 1.3 2.9
MC -40 1.3 4
MC -50 1.3 4.5
MC -65 1.3 4.5
MC -75 1.3 4.5
MC -85 1.3 5.1
5.2.3. KEY POINTS FOR INSPECTING CONTACTORS
 Check that the plastic parts are not blackened and do not show signs of burning or hardening.
 Check that the head is properly inserted.
 Check the tightness of cables and terminals, as shown in Table 5 .
 The terminals must be clean.
 If the capacitor bank includes RD discharge resistors, check they are in good condition (that
they are not open or show signs of burning). ( Figure 18 )
Figure 18: Connection of the discharge resistors.
 Cleaning the contactors: In dirty environments (dust, sawdust, rust particles, etc.) vacuum
the contactor periodically.
There is no estimated time frame for cleaning, it depends on the amount of dirt that is inside
the bank.
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OPTIM HYB Series
Instruction Manual