| 摘要 |
With fault current circuit breakers or differential current circuit breakers, a test key is often used in the prior art to close a test current circuit so that a test current, which simulates a fault current, flows and a check as carried out to determine whether the circuit breaker functions in a proper manner. In accordance with the invention, a test lever element (16) is used instead of a test key. This is pivoted about the same axis of rotation as the conventionally provided opening/closing control lever (12) of the circuit breaker, and the movement of the test lever element (16) can be partially coupled to this control lever (12). A surface of the test lever element which can be manipulated by the operator has the same cross-sectional profile as that of the surface of the control lever which can be manipulated by the operator. In a predetermined position of the test lever element (16), the test current circuit is closed. This predetermined position is preferably an intermediate position of the test lever element between two end positions, so that the test current only flows briefly. |
