| 摘要 |
At least two switches (e.g. V1, K1; V2, K2) are connected in series in each branch of the load (KL). At least one of the switches in each branch of the load is separately controlled by a control unit. At least two detectors (V3,V4) are provided for monitoring the switching states of the switches (V1,K1;V2,K2). The outputs of the detectors are connected to the control unit. The control unit triggers a warning or emergency operation based on the switching state information provided by the detectors. |
