| 摘要 |
<p>The relay has a movable contact [41] and fixed contact conductors [31,32]. Within the top section is a movable permanent magnet [44] that is in line with an electromagnet having an armature [20] and a coil. When the coil is momentarily supplied with power the magnets attract and the circuit contacts are held together. If the coil current is applied to reverse polarity the contacts open.</p> |
