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WL Circuit Breaker
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WL Selection and Application Guide • 2005
Electronic Trip Unit
Electronic Trip Unit ETU725
Application:
Low-cost building, motor and plant
protection up to 5000A.
Features:
• Adjustable long-time overload
protection with
I
2
t characteristic time delay
Long-time delay fixed at
tR=10 seconds at 6 x I R
• Short-time delay short-circuit
protection, adjustable from
1.25... 12 x In
• Instantaneous short-circuit
protection fixed at 20 x In. 50kA max
• Replaceable Rating Plug allows
instant adaptability to the required
plant currents, thus ensuring
overload protection of 200A
to 5000A
• Overcurrent alarm indicator
• LED trip cause indicator
• Option for testing the trip unit
• Protective parameters set via
rotary switch
For technical details, see table
on pages 1/36 and 1/37.
Application:
Low-cost building, motor and plant
protection up to 5000A.
Features:
Same as for ETU725 plus the
following:
• Selectable neutral conductor
protection
• Integrated ground fault protection,
3- or 4- wire residual only
For technical details, see table
on pages 1/36 and 1/37.
Electronic Trip Unit ETU727
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