During the short-time withstand current test,
the ground conductor rail-mount terminal
blocks are subjected three times for one sec-
ond each current load 120 A/mm². For example, the short-time with-
stand current test per IEC/EN 60947-7-1, through rail-mount terminal blocks must capable withstanding for one second the rated
short-time withstand current which corresponds 120 A/mm² its nominal cross section.wago. Terminal blocks and connecting devices must able withstand such conditions.
.13
www., when motors are started. Also, the event short circuit, high current can flow for short time until the
fuse element melts.
The pass criterion for the test the voltage
drop (limiting value and constant measured
values).com
mV
Test specimen
VCC
VCS
ICS ICC
Measuring
point
Measuring
point
Measuring
point
WAGO Rail-Mount Terminal Block Systems
Technical Information
• Short-Time Withstand Current Test (Short-Circuit Withstand Capacity) per IEC/EN 60947-7-1
Apart from the rated current that can constantly applied electrical device, operation-related short peak currents consistently occur
in electrical installations, e.g
