Noise Considerations

Yes, contactors can make noise when they operate. The noise level depends on the contactor's size, construction, and operating frequency.

Closing noise

When a contactor closes, it creates an arc that can generate a loud "pop" or "snap" sound.

Opening noise

When a contactor opens, the arc is extinguished, which can also produce a snapping sound.

Contact bounce

After opening or closing, the contactor's contacts may bounce several times before settling into their final position. This can create a rapid clicking or chattering noise.

Specific to Your Application



Using contactors

Placing contactors ahead of the disconnects and using door contacts to open them when the door is opened would create a noticeable noise each time the door is opened and closed.

Using molded case switches with shunt trip coils

Replacing the disconnects with molded case switches with shunt trip coils would eliminate the contactor noise.

Recommendation

Given the noise concerns, it would be best to use

molded case switches with shunt trip coils. This solution would provide a reliable and safe method of de-energizing the power when the door is opened without creating excessive noise.

Additional Considerations: Ensure that the molded case switches have the appropriate amperage and voltage ratings for your application. Use high-quality switches from a reputable manufacturer to minimize noise and ensure long-term reliability. Consider installing sound-dampening materials around the switches if necessary to reduce noise further. Flag for review