Reply by ChrisK

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Posted on Electrical questions, voltage and surge protection for router and lathe

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2076 posts in 4541 days

#1 posted 09-05-2014 07:17 PM

The surge protector does not need to handle the motor current. The surge protector is designed to prevent he voltage at the motor from spiking above a certain level. The clamping of the voltage by the surge protector is limited by the joule rating of the device. The higher the joule rating the more surge current from the voltage spike the device can absorb. Look for a 400V or less clamping voltage on the surge device.

For the start up current on the motor the transformer needs to be large enough to not allow the secondary voltage, the 115V, to dip. Not every 2KVA transformer may have enough copper and steel to prevent the drop in voltage due to the start up current. The lower the temperature rise for a given kva the better the transformer. Dig around a few transformer manufacturers sites for more info. Square D, Eaton, ABB and Siemens are a few of the big ones. They all make surge protectors as well.

-- Chris K

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