WEG Molded Case Circuit Breakers - User’s Manual
www.weg.net
WEG Molded Case Circuit Breakers - User’s Manual
7
Caution
When aluminum conductors are used, the application of a suitable
joint compound is recommended to reduce the possibility of terminal
overheating. Overheating can cause nuisance tripping and damage to the
circuit breaker.
7. Connect line and load conductors and accessory.
8. After the circuit breaker is installed, check all mounting hardware and terminal
connecting hardware for correct torque loading. Torque values for line/load
terminals are given in Table 2 and on the circuit breaker nameplate.
9. Install line terminal cover on circuit breaker cover with mounting screws
provided. Torque to 20-22 lb-in (2.26-2.49 N.m).
Terminal Cat.
No. @
Terminal
material
body
Screw
head
type
AWG
wire
range
Metric
wire
range
(mm²)
Wire
type
Torque value
lb-in (N.m)
LT3 UBW400
1)
Aluminum
Socket
400-500 (2)
185-240
Cu/Al
275 (31.1)
Table 2:
terminal types
Notes: 1) Sold in 3-poles kits only.
10. When step-type terminals (Cat. No. LT3D UBW600 or LT3D UBW400) are
used, terminal shields (supplied with terminals) must be installed on the circuit
breaker (Figure 5) and secured using retainer and screws included with the
terminal shield kit. Warning label supplied with the kit must be attached to the
circuit breaker cover.
Screws
Retainer
Warning
label
Terminal shield
Figure 5:
installation of terminal shields and warning label