| 摘要 |
The aim of the invention is to provide a test circuit (16) which is independent of the power supply and which enables a circuit breaker (2) to be tested in a reliable manner. To achieve this, the test circuit (16) comprises a test coil (18), which is devoid of electric potential and is wound round a totalizing current transformer (4). Said test coil is preferably short-circuited using a test switch (20) and a connectable load (R2). This simulates the occurrence of a residual current. The selection of an appropriate connectable load (R2) allows the sensitivity of the circuit breaker (2) to be tested in an advantageous manner.
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