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WL Circuit Breaker selection and application guide
Low Voltage Circuit Breaker
Accessories
Breaker lifting device
The breaker lifting device is designed to safely transport the
WL breaker when using a hoist or other lifting equipment. The
device is expandable to conform to all three WL frame sizes and
easily attaches to specified lift points on the breaker.
Order part number WLLFT
A portable lift hand truck (not shown) is available
Order part number WLHOIST
Digital input module
The digital input module enables up to six additional binary
signals (24V DC) to be connected. Signals, such as breaker
status, arc-flash current reduction, over-temperature conditions
or control circuit status switchgear, can be transmitted directly
to the power monitoring network.
A total of 6 inputs are available in the “BUS Input” Switch
position. Six inputs are also available if the rotary switch is in
the “Parameter Switch” position, although the first input causes
the active parameter set to change. If the connected ETU does
not have two parameter set capability (e.g. ETU745 or ETU748),
this input can also be used without any restrictions.
Digital Input Module: Order part number WLDGNCUB
CubicleBUS modules
External CubicleBUS modules enable the WL Circuit Breaker a
way to interface with external switchgear controls or building
management systems. They can be used, for example, to activate
analog displays or devices, transmit circuit breaker status and
cause of trip, or read external device control signals. One
module is suitable for zone-selective interlocking main and
branch breakers.
Three different CubicleBUS modules can output data from the
CubicleBUS system (two digital output modules and one analog
output module). A digital input module can transmit data from
the switchgear or system to a PROFIBUS/MODBUS master device
like a power meters or logic controllers.
Digital Output Module with Rotary Switch – The digital output
module can be used to output six events. These events can be
warnings or trips and can be used for external annunciation or
control. The load shedding and load restoring signals can enable
a load to be switched ON or OFF automatically. The digital output
module is available in two versions. The “optocoupler” version
features solid state outputs. The current carrying capacity of this
output is 150mA, and the nominal voltage is 24V DC. Only DC
voltage can be switched. The “relay” version, uses a relay contact
with a maximum load of 12A. Voltages of up 250V AC/DC are
possible. The relay contacts are isolated.
Opto-Coupler Digital Output Module:
Order part number WLDGSCUB
Relay Digital Output Module: Order part number WLRLYCUB
ZSI module
To use the ZSI function with the WL Circuit Breaker, the external
CubicleBUS ZSI module must be implemented. The zone selective
interlocking (ZSI) module provides the complete range of
selectivity with the short delay time of tZSI = 50 ms, irrespective
of the number of levels and the location of the short-circuit in
a distribution system. Its benefits become even more apparent,
the higher the number of levels in large systems and the longer
the resulting delay times. By shortening the time, the ZSI module
significantly reduces stress and damage in the event of a short-
circuit in the switchgear.
Zone Selective Interlocking Module: Order part number WLZSIMD
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