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WL Circuit Breaker
Electronic Trip Unit (ETU)
ETU models and features
Features and characteristics
Long-time overcurrent protection (L)
Short-time delayed overcurrent protection (S)
Instantaneous overcurrent protection (I)
Neutral conductor protection (N)
Ground fault protection (G)
Selectable neutral protection
Defeatable short-time protection
Defeatable instantaneous protection
Selectable thermal memory
Zone selective interlocking
2
Selectable I
t or fixed short-time delay
Adjustable instantaneous pick-up
2
4
Selectable I
t or I
t long-time delay
Adjustable short-time delay and pick-up
Selectable and adjustable neutral protection
Dual protective setting capability
Dynamic arc-flash sentry (DAS)
Extended instantaneous protection (EIP)
Parameterization by rotary switches
Parameterization by communication (absolute values)
Parameterization by menu/keypad (absolute values)
Remote parameterization of the alarm functions
Remote parameterization of the relay functions
Alphanumeric display
Graphical display
Power metering function
Communication via PROFIBUS-DP
Communication via the MODBUS
Communication via the Ethernet (BDA)
(X) = standard feature, (O) = optional feature
WL Circuit Breaker Selection and Application Guide
Courtesy of NationalSwitchgear.com
ETU745
ETU748
X
X
X
X
X
X
X
O
O
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
O
O
O
O
O
O
O
O
O
O
ETU776
X
X
X
X
O
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
O
O
O
O
9
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