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quick capacitor question

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LAN_403

teslacoolguy

Thu Jun 26 2008, 05:00AM

Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792

I need to buy power factor correction capacitors for a mot bank before i fire it up and i was wondering what is better, motor start caps or motor run caps?

Steve Ward

Thu Jun 26 2008, 06:16AM

Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055

You want motor RUN caps, never use start capacitors for extended amounts of time. They really are only intended to start the motor, and then be switched out of circuit after maybe a second or so. If left in circuit with voltage applied to them, they do fail.

Motor run caps are almost always in a pressed steel can type enclosure. Motor start caps are often black plastic cylinders.

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