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AVTM24-1J REV A April 2006
38
flowing in the circuit and shall not exceed the limit set
for the rating by the manufacturer”.
IEC 61166 Ed. 1.0, B:1993
High-Voltage Alternating-Current Circuit-Breakers
Part 4: Type Tests and Routine Tests
Paragraph 3.1 Measurement of the Résistance of the
Main Circuit
“The resistance of each pole of the main circuit shall
be measured for comparison between the circuit-
breaker type-tested for temperature rise and all circuit-
breakers of the same type subjected to the routine
tests.
The measurement shall be made with dc by measuring
the dc voltage drop, or resistance, across the terminals
of each pole.
The current during the test shall have any convenient
value between 100A and the rated normal current”.
This 100-ampere test capability is achieved by adding a
special current source and range module to a more general-
purpose instrument, the Catalog No. 247000 DLRO, while
retaining all the features of that instrument.
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