| 摘要 |
<p>A power source device for a circuit breaker according to this invention has a construction which rectifies and smooths an output of current detection means. The device comprises a switching circuit (15) for changing-over the resulting output to a dummy burden (13) or a constant-voltage generating circuit (14), and in which the switching circuit (15) is controlled on the basis of an output voltage (Ve) of the constant-voltage generating circuit or rectification means (10), while the dummy burden (13) and a burden including the constant-voltage generating circuit (14) are equivalently equalized. Since the dummy burden and the burden including the constant-voltage generating circuit are equivalently equalized, fluctuations in the burden of a capacitor (11) are eliminated.</p> |
