| 摘要 |
An explosion proof electromagnetic door holder includes an explosion cover to protect internal door holder components. The explosion proof electromagnetic door holder comprises a wall box, the explosion cover attached to the wall box, a coil assembly attached to the explosion cover, and a face plate over the explosion cover. The explosion cover protects the coil assembly in the event of an explosion. The coil assembly includes a bobbin containing a wire coil. A sealant, preferably epoxy, may be used to cover the face of the bobbin to prevent moisture from entering the coil assembly. A coil seal may also be incorporated between a cover passage in the explosion cover and the coil assembly to resist the entry of moisture into the wall box. The resulting explosion proof electromagnetic door holder resists damage to the coil assembly in the event of an explosion.
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