Siemens UL 1066 Operating Instructions Manual page 329

Low voltage power circuit breaker
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VT
Voltage transformer
WAGO
WAGO Kontakttechnik, München
X
Terminal designation according to DIN
ZSI
Zone Selective Interlocking
I
Present average of current
avg
I
Long term average of current
avglt
I
Distortion factor of current
THD
U
Distortion factor of voltage
THD
25 – 4

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