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Eric R Snow
- Jan 1, 1970
- 0
I have a 120 VAC 1 hp motor that I want to control with a solid state
relay because they are sealed. Looking at solid state relays with 3 to
32 VDC control voltage I found a couple that might work. 1 is rated
240 VAC 25 amps. The other is rated 240 VAC, 40 amps, and is zero
crossing. And twice as much as the 25 amp model. Since the load is an
AC induction motor does the zero crossing relay need to be used? Is
either relay appropriate? Will these relays rated at 240 volts be OK
switching 120 volts as long as the amperage is within spec?Here's a
link to the relays:
http://www.aaaim.com/u/web/aaaimc/cgi-local/shop991/shop.pl/SID=59872674/page=RELS.htm#RL2052
The stock numbers are RL9801and RL2052. They are located near the
bottom of the page.
One other thing comes to mind. Since these relays are solid state
devices and they may be sensitive to voltage spikes (I don't know if
they are or not). If they are, and fail in the ON mode, it won't be a
safety hazard because the motor can run continuously without burning
up. The motor runs a circulating pump so the water would just get
circulated more.
Thank You,
Eric R Snow
relay because they are sealed. Looking at solid state relays with 3 to
32 VDC control voltage I found a couple that might work. 1 is rated
240 VAC 25 amps. The other is rated 240 VAC, 40 amps, and is zero
crossing. And twice as much as the 25 amp model. Since the load is an
AC induction motor does the zero crossing relay need to be used? Is
either relay appropriate? Will these relays rated at 240 volts be OK
switching 120 volts as long as the amperage is within spec?Here's a
link to the relays:
http://www.aaaim.com/u/web/aaaimc/cgi-local/shop991/shop.pl/SID=59872674/page=RELS.htm#RL2052
The stock numbers are RL9801and RL2052. They are located near the
bottom of the page.
One other thing comes to mind. Since these relays are solid state
devices and they may be sensitive to voltage spikes (I don't know if
they are or not). If they are, and fail in the ON mode, it won't be a
safety hazard because the motor can run continuously without burning
up. The motor runs a circulating pump so the water would just get
circulated more.
Thank You,
Eric R Snow