Too much starting current. Wire them up so that the two items (both
115 volt?) are on different 15 amp circuits. It may take a bit of
(safe) jiggery-pokery for the vacuum switch on one tool to start up
the electrcity to the other tool (the dust collector motor which is
wired to a different supply.
I have exactly this set up, with a 230 volt table saw and then an
arrangement to start up a 115 volt vacuum dust collector, which is not
yet installed! Right now I can plug in a 115 volt window fan that then
starts 'automatically' when the 230 volt bench saw is running.
Naturally the 230 volt and the 115 volt supplies are on different
The easiest fix is to return the one you bought for the remote starting
Alternatively, find one of the plug-in types similar to what you have
but that has a start delay built in as well as stopping to eliminate the
simultaneous starting surge or one that senses motor current from one
circuit but allows the tool to be on another. If the one you have plugs
into the saw outlet and the tool to be controlled plugs into it, it
would be more difficult to modify. There are just current sensors w/
start relays that serve the other function.
My only recommendation on breaker changeout would be that should have
run 30A service for shop circuit instead of 20A, but by Code that would
be 10ga, not 12ga.
A longer time-delay is probably possible to find, but I'd venture it
might be more expensive than the remote start option above.
Something sounds like it could be wrong, I use a 1.5hp collector that
recommends a 20 amp circuit, on 15 amp circuit along with a 15 amp router.
Both coming on at the same time is a problem.
In answer to your question, there are slow blow breakers to address
situations like this but I would still be cautious.
There are also quite a few circuit breakers from a number of different
manufacturers that have been recalled due to failure to trip when
overloaded. Federal Pacific is one example:
You need a higher amp circuit, or plug DC and tabesaw into different
circuits, or switch to 220v. My lights used to momentarily dim as I
powered on the DC, but switching from 110v to 220v solved that. Plus,
there are other benefits to 220v.
Breakers are designed with different trip curves depending on the
Breakers designed for resistive loads will trip sooner than one designed to
handle motor inrush current. Each manufacturer typically has three or four
Find a local electrical supply and get a breaker rated for HVAC service.
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