| 摘要 |
A magnetically operated digital switch (10) includes an array of magnetically actuated relays (14-24) mounted adjacent a magnetic shield (26) having an array of holes (28-38) therein corresponding to the location of the relays (14-24). The switch assembly is mounted on a nonmagnetic plate so that the relays can be actuated by a small magnet (58) which is positioned adjacent the holes in the magnetic shield (26). The shield (26) prevents magnetic flux which is applied to one of the relays from being spilled over and inadvertently actuating a nearby relay. An alarm circuit (50) is provided to decode the key number sequence entered into the digital switch (10) for operation of an alarm relay (56) when the proper key number is entered.
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