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x046866x
Starting Member
USA
9 Posts |
 Posted - 07/26/2012 : 05:40:31 AM
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I am not 100% sure; does "Normally open" mean that under default conditions the switch would be in the off position, meaning no power to the device, as the circuit is open?
I want to power something that only needs to be on for short periods of time and during reset's, like a power outage, I'd like it to remain off.
The "Normally closed" refers to a water heater application so that implies "normally the device has power" would be preferred....but I just want to be sure before buying a relatively expensive switch.
BTW: I am using this to power a remote air compressor and only want it on when I need it. |
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Tfitzpatri8
Administrator
USA
6886 Posts |
Posted - 07/26/2012 : 06:03:54 AM
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| Yes, that's correct. |
Volunteer Moderator & Home Automation Enthusiast |
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x046866x
Starting Member
USA
9 Posts |
Posted - 07/26/2012 : 06:13:40 AM
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| Thank you! |
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icerabbit
Average Member
USA
62 Posts |
Posted - 10/01/2012 : 12:33:26 PM
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Thank you!
This answered my question as well, that I need the normally open one to run the pool pump remotely, which is more off than on and I want to remain in the off position by default. |
Edited by - icerabbit on 10/01/2012 12:34:00 PM |
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flsr
Starting Member
USA
5 Posts |
Posted - 12/10/2012 : 12:47:45 PM
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| What is the implication of using a normally closed controller on a device such as a pool pump which is off most of the time? Is the normally closed controller likely to fail? |
flsr |
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Tfitzpatri8
Administrator
USA
6886 Posts |
Posted - 12/10/2012 : 1:24:01 PM
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Generally speaking, a mechanical device that is placed under constant stress will wear out faster than one used intermittently.
Since the core of the device is a heavy-duty electromechanical relay, that probably explains why they make two models: one normally closed, another normally open. |
Volunteer Moderator & Home Automation Enthusiast |
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2477SA1 (open) vs. 2477SA2 (closed) 220V relay
