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Old 07-22-2012, 08:48 PM   #1
bendiy
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Default DPST Power Relay for 240V 30A Kill Switch?

I scavenged this relay and I think it will work as a main kill switch to a water heater element, but I wanted to get a confirmation.

Potter & Brumfield T92S7A22-120

Here's the datasheet.

It says max contact current rating is 30A and max contact voltage rating is 600V. It's a DPST relay. Should this be fine for both legs going to a 240V 5500W water heater element? I would drive the relay coil with 120V and a switch to act as a kill switch to the heater element. I'll be doing the PID control with an SSR, this is just a main safety on/off switch.


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Old 07-22-2012, 09:17 PM   #2
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That contactor will do the job very well for you. It is rated well within the power requirements for your mission.

No worries.

P-J


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Old 07-23-2012, 02:29 PM   #3
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Thanks P-J.
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Old 09-12-2013, 03:27 PM   #4
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This is a bit of an old thread, but will this relay switch two 2000W 110V elements?

From the documentation:

Quote:
Rated voltage 277VAC
Max. switching voltage 600VAC
Rated current 30A NO; 3A NC
Limiting continuous current 40A NO; 3A NC
Limiting making current 40A NO; 3A NC
Limiting breaking current 40A NO; 3A NC
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Old 09-12-2013, 06:46 PM   #5
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Quote:
Originally Posted by mikeal View Post
This is a bit of an old thread, but will this relay switch two 2000W 110V elements?

From the documentation:
Yeah, it should work fine granted you have the two elements on separate poles


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