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V
VDE Verband der Elektrotechnik Elektronik Informationstechnik: Electrotechnics, Electronics and
Communications Technologies Association (Germany).
W
Watchdog Alarm relay for reporting internal failures and auxiliary supply shortage.
X
-
Y
-
Z
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∑ (Sigma)
∑A Cumulative trip ampere-meter / value.
∑A
2
Cumulative trip ampere-square-meter / value.
Θ (Theta)
%θ Thermal heating percentage.
%
%Θ
p
Thermal overload pre-heating percentage.
%Θ
trip
Thermal overload trip heating percentage.