Description
2.4 Electronic trip unit ETU
Air circuit breaker 3WL10
56
Manual, 11/2017, L1V30499596002-01
Electronic trip units of the 6-series
Protection functions of the ETU
ETU650 LSI
ETU660 LSIG
L
LT: Overload protection
Protection function can be enabled/disabled
Via rating plug "L = off"
Via rating plug "L = off"
Setting range of operating value I
r
= I
n
x …
0.4 to 1 (in steps of 0.001)
Default value: 1
Tolerance
1)
: Tripping
between 1.05 and 1.2 x I
r
0.4 to 1 (in steps of 0.001)
Default value: 1
Tolerance
1)
: Tripping
between 1.05 and 1.2 x I
r
Setting range for delay time t
r
at I²t
(reference point 6 x I
n
)
0.75 to 36 s (in steps of 0.25)
Default value: 36 s
Tolerance
1)
:
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
0.75 to 36 s (in steps of 0.25)
Default value: 36 s
Tolerance
1)
:
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
Switchable overload protection characteristic
IEC 60255-151
t
trip
=(t
r
∙
b)/((I
load
/I
r
)^
α
-1)
I
4
t: α=4, b=1296
standard inverse SI: α=0.02,
b=0.0364
very inverse VI: α=1, b=5
extremely inverse EI: α=2,
b=35.2
Default value: I²t
I
4
t: α=4, b=1296
standard inverse SI: α=0.02,
b=0.0364
very inverse VI: α=1, b=5
extremely inverse EI: α=2,
b=35.2
Default value: I²t
Setting range for delay time t
r
for characteristic
IEC 60255-151
(reference point 6 x I
n
)
0.75 to 5 s (in steps of 0.25)
Default value: 5 s
Tolerance
1)
:
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
0.75 to 5 s (in steps of 0.25)
Default value: 5 s
Tolerance
1)
:
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
Thermal memory can be enabled/disabled
●
●
Overload pre-alarm
50 to 100 % x I
r
(in steps
of 1%)
Default value: 90 %;
50 to 100 % x I
r
(in steps
of 1%)
Default value: 90 %;
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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