28 – 3
S23 Signaling switch for 2nd shunt trip
S24 Bell Alarm signaling switch
S3 Contact position-driven auxiliary switch
S30 Signaling switch for disconnected position (TOC)
S31 Signaling switch for test position (TOC)
S32 Signaling switch for test position (TOC)
S33 Signaling switch for connected position (TOC)
S34 Signaling switch for connected position (TOC)
S35 Signaling switch for connected position (TOC)
S4 Contact position-driven auxiliary switch
S40 csignaling switch for "ready-to-close"
S41 c signaling switch for "closing spring charged"
S43 c signaling switch for 2nd shunt trip
S44 c signaling switch for "main contacts OPEN / CLOSED"
S45 c tripped signaling switch
S46 c signaling switch for connected position
S47 c signaling switch for test position
S48 c signaling switch for disconnected position
S50 ... S53 MOC (external auxiliary switches)
S-tripping Short-time delayed tripping
SIGUT Siemens trademark for aux. termination technique
ST Shunt trip
T.U. ERROR Trip unit error
TEST Test position
t
g
Delay time for G-tripping
TOC Truck operated cell switch (S30 … S35)
t
R
Delay time for L-tripping (defined at 6 x I
R
)
TRIP G Trip cause was ground fault
TRIP I Trip cause was short-circuit (instantaneous)
TRIP L Trip cause was overload
TRIP N Trip cause was neutral pole overload
TRIP S Trip cause was short-circuit (short-time delayed)
t
sd
Delay time for S-tripping
t
x
Delay time for load monitoring
U
c
Rated control voltage
U
e
Rated operational voltage
U
i
Rated insulation voltage
U
Imp
Rated impulse withstand voltage
UL Underwriters Laboratories Inc.
UVR Undervoltage release (instantaneous)
UVR td Undervoltage release (delayed)
VT Voltage transformer
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