| 摘要 |
In order to accurately detect an operation abnormality of a moving contact, the operation abnormality of the moving contact (9) with respect to a fixed contact (10) is detected on the basis of at least one of a separation transient response signal of a coil current in an excitation coil (6) when a separation pulse signal is supplied, and an attraction transient response signal of the coil current when, in a state such that an attraction signal is being supplied, an attraction pulse signal is supplied. |
