Accessories
3.4 External accessories
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01
91
Rogowski CT solo external neutral
The optional Rogowski CT solo external neutral is only for three-pole circuit breakers. It
enables protection of the neutral conductor from overload and short-circuit by the ETU of the
circuit breaker. The transformer is connected directly to the auxiliary conductor terminal
system. It is suitable for all electronic trip units of the 3- and 6-series.
The Rogowski CT solo external neutral is also used for determining ground-fault currents by
calculation of the vector sum of the currents for trip units with a G protection function
(ETU360 and ETU660).
T5
Rogowski CT solo external neutral
External CT for grounding conductors of the main power supply (grounded transformer star point)
GF-CT
Currents in the grounding conductor of the transformer star point can be directly measured
with high accuracy using this toroidal-core transformer and can be evaluated with the
ETU660 (LSIG). The transformer is connected to the auxiliary conductor terminal system of
the circuit breaker. The external current transformer for the grounding conductor of the
power supply is available with rated currents 100 A and 250 A.
Direct measurement of ground currents is an alternative to the vector sum calculation.
T6
External CT for grounding conductors of the main power supply (grounded transformer star
point) GF-CT
Summary of Contents for SENTRON 3WL10
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Page 8: ...Table of contents Air circuit breaker 3WL10 6 Manual 11 2017 L1V30499596002 01 ...
Page 170: ...Operation 6 3 Troubleshooting Air circuit breaker 3WL10 168 Manual 11 2017 L1V30499596002 01 ...
Page 180: ...Technical specifications Air circuit breaker 3WL10 178 Manual 11 2017 L1V30499596002 01 ...
Page 199: ...Air circuit breaker 3WL10 Manual 11 2017 L1V30499596002 01 197 Circuit diagrams 10 ...
Page 212: ...Circuit diagrams Air circuit breaker 3WL10 210 Manual 11 2017 L1V30499596002 01 ...
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