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WEG Molded Case Circuit Breakers - User’s Manual
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WEG Molded Case Circuit Breakers - User’s Manual 3
Circuit
breaker
types
Trip unit types
Thermal-magnetic
in (Amperes)
LSI, LSG,
LSIG
Digitrip RMS (electronic)
Fixed
thermal
Magnetic
adjustable
Trip unit
rating
Fixed rating
plug
Adjustable
rating
plug
Adjustable
short time
UBW800S
UBW800H
800 4 to 8 x l
n
800 800 600/800 4 to 8 x l
n
Table 1:
available trip unit ratings
Type UBW800 circuit breakers are factory sealed breakers with non-interchangeable
trip units. Factory sealed breakers may be installed with reverse feed.
1.1. 100 PERCENT RATED UBW800 CIRCUIT BREAKERS
This instruction leaflet (IL) gives procedures for installation and field testing of
UBW800 circuit breakers.
Internal accessories are available which are field installable in nonfactory sealed
breakers. They are factory installed in sealed breakers.
2. INSTALLATION
The installation procedure consists of inspecting the circuit breaker and, as
applicable, installing the trip unit, accessories, 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:
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 instruction 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 the trip unit and accessories (if required) in circuit
breaker frame. See Figure 2. Rating plug must be installed in electronic trip units.