www.weg.net
WEG Molded Case Circuit Breakers - User’s Manual
4
2. INSTALLATION
The installation procedure consist of inspecting the circuit breaker and, as
applicable, installing the trip unit, accessories, interphase barriers, and terminals;
mounting the circuit breaker; connecting the line and load conductors; torquing
terminals and attaching terminal shields. Circuit breaker frames, trip units, rating
plugs, accessories, mounting hardware, and unmounted terminals may be supplied
in separate packages. To install the circuit breaker, perform the following steps.
Note: UBW600 circuit breakers are factory sealed for reverse feed applications under UL 489. U Lrequires that
internal accessories be installedat the factory in these types of circuit breakers.
Internal accessory installation in any type of circuit breaker should be done before the
circuit breaker is mounted and connected. Refer to individual accessory instruction
leaflets for specific installation instructions on field installable accessories.
1. Compare nameplate data with existing equipment ratings and system
requirements to make sure that the circuit breaker is suitable for the intended
installation. Prior to mounting, confirm that the circuit breaker has not been
damaged during transit or initial handling.
2. To install trip unit and any internal accessories, remove installed cover screws
and cover.
Note: The circuit breaker handle must be in the tripped or OFF position to remove the cover. Instructions for
installing the trip unit and accessories are supplied with the devices.
3. If not already installed, mount trip unit and accessories (if required) in circuit
breaker frame.
Note: When required to be removed or replaced, stationary interphase barriers can only be installed removed with
circuit breaker in the tripped or open position.
4. After the trip unit and any internal accessories are installed, and with the circuit
breaker in the tripped position, make sure that stationary interphase barriers are
properly installed in base. Install cover and secure with pan-head screws. Eight
screws are used for two and three pole circuit breakers. Ten screws are used for
four pole circuit breakers. Torque to 20-22 Ib-in (2.26-2.49 N.m.).
5. If not already installed, mount wire connecting terminals as shown in Figure 2.
Secure the terminals to the circuit breaker using two pan-head slotted screws
and lock washers. Torque to 6 to 8 Ib-ft (8.14 to10.85 N.m). With the circuit
breaker mounted and before the conductors are installed and conductor
clamping screws inserted, the terminal mounting screws may be checked for
correct torque.
