Im trying to wire a toggle to control 2 speeds on a blower. Its a 30 amp circuit, but I can't seem to find a 30 amp rated toggle. Or is it the motors amp draw that the switch is rated for and not the circuit?

Will this switch work?
http://www.sears.com/gardner-bender-gsw-13-20a-heavy-duty/p-SPM6449610407P

 

Your switch has a HP rating of 3/4. Check the blower HP rating.
If the blower motor is around 1/2 HP or less, should be OK.
It's usually a good idea to operate components at less than max. rating.

 

Your switch has a HP rating of 3/4. Check the blower HP rating.
If the blower motor is around 1/2 HP or less, should be OK.
It's usually a good idea to operate components at less than max. rating.

So if the hp is correct its ok to run 30 amps into the switch? Just want to be sure I don't run the wrong amount of amp's into the switch. Thanks for the fast response.

 

So if the hp is correct its ok to run 30 amps into the switch? Just want to be sure I don't run the wrong amount of amp's into the switch. Thanks for the fast response.

30 amps is the maximum the circuit can supply. The motor will draw only the current it needs through the switch. The switch rating is based on the motor current or horsepower rating, not the circuit rating. As a side note, AC circuits should not be loaded at more than 80% of the circuit rating, or whatever the local codes require.

 

Not much left to say here. The switch is running the motor, not the circuit breaker. If the switch is rated to run a motor that size, go for it.

 

30 amps is the maximum the circuit can supply. The motor will draw only the current it needs through the switch. The switch rating is based on the motor current or horsepower rating, not the circuit rating. As a side note, AC circuits should not be loaded at more than 80% of the circuit rating, or whatever the local codes require.

Thanks so much. Heres the info off the motor. Nothing wrong with triple checking.

208/230v
1/2hp
A. 2.90
HZ. 60
Ph. 1

 

Not much left to say here. The switch is running the motor, not the circuit breaker. If the switch is rated to run a motor that size, go for it.

After burning up my last motor I don't want to take chances.

Finally got this thing mounted like I wanted just need to add filters, junction boxes, and switch to tidy thing up.

 

Thanks so much. Heres the info off the motor. Nothing wrong with triple checking.

208/230v
1/2hp
A. 2.90
HZ. 60
Ph. 1

Triple checking is sometimes a good thing....

Heavy Duty Toggle Switch, Single Pole Double Throw, On/Off/On, Screw Terminal, Recommended Mounting Hole Fits 1/2" Diameter, 20A/125V, 3/4 HP, Carded.

Switch: HP OK, Voltage Not OK . Need a 208/230 volt rated switch.

 

Here is a limitation: Those fans are designed to fight against air flow restriction in the ductwork. The more air they can get at the intake, the more power they will use. Check the running amps to be sure you aren't going over the current limit (2.90 amps). If the current is too high, you will have to reduce the intake air by using some kind of partial (mechanical) obstruction.

ps, tubeguy caught the voltage error

 

Triple checking is sometimes a good thing....

Heavy Duty Toggle Switch, Single Pole Double Throw, On/Off/On, Screw Terminal, Recommended Mounting Hole Fits 1/2" Diameter, 20A/125V, 3/4 HP, Carded.

Switch: HP OK, Voltage Not OK . Need a 208/230 volt rated switch.

Glad I triple checked. The switch I have in hand says:

10A 277 V AC/ 20A 125 V AC
3/4 HP 125-250 V AC

Since the motor only needs 2.9 amps, and 10A/ 277 V covers that correct?
That means I could potentially run this switch at 10 max on 277 V max right?
I don't think the motor is pulling either of those.

As for air restriction. I will be installing a series of filters on the intake side of the blower.

 

Have a look at this one:
http://www.mpja.com/SPDT-On-Off-On-Full-Size-Toggle-Switch/productinfo/12218 SW/
Center off, SPDT, 250V 15A, 125V 20A, $1.50.

 

Glad I triple checked. The switch I have in hand says:

10A 277 V AC/ 20A 125 V AC
3/4 HP 125-250 V AC

Since the motor only needs 2.9 amps, and 10A/ 277 V covers that correct?
That means I could potentially run this switch at 10 max on 277 V max right?
I don't think the motor is pulling either of those.

As for air restriction. I will be installing a series of filters on the intake side of the blower.

???


After testing the motor is pulling 2.5 amps.

 

You should be using a manual on-off motor starter for 3/4 HP motors and not just a simple switch...the reason is the motor starter will protect the motor from burning up or otherwise overheating...the are in-expensive enough...look in E bay's industrial section.

Cheers, DPW [ Everything has limitations...and I hate limitations.]