Talk About the Latest in Home Automation/Home Electronics
Home Automation Forum

Smarthome Forum
Login or Register
 
Home | Profile | Register | Active Topics | Search | FAQ | Smarthome
 All Forums
 General Discussion
 INSTEON
 2477SA1 (open) vs. 2477SA2 (closed) 220V relay
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

x046866x
Starting Member

USA
9 Posts

Posted - 07/26/2012 :  05:40:31 AM  Show Profile  Reply with Quote
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.

Tfitzpatri8
Administrator

USA
8604 Posts

Posted - 07/26/2012 :  06:03:54 AM  Show Profile  Reply with Quote
Yes, that's correct.

Volunteer Moderator & Home Automation Enthusiast
Go to Top of Page

x046866x
Starting Member

USA
9 Posts

Posted - 07/26/2012 :  06:13:40 AM  Show Profile  Reply with Quote
Thank you!
Go to Top of Page

icerabbit
Average Member

USA
71 Posts

Posted - 10/01/2012 :  12:33:26 PM  Show Profile  Reply with Quote
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
Go to Top of Page

flsr
Starting Member

USA
5 Posts

Posted - 12/10/2012 :  12:47:45 PM  Show Profile  Reply with Quote
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
Go to Top of Page

Tfitzpatri8
Administrator

USA
8604 Posts

Posted - 12/10/2012 :  1:24:01 PM  Show Profile  Reply with Quote
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
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
Smarthome Forum © 2000-2014 SmartLabs, Inc Go To Top Of Page
Powered By: Snitz Forums 2000 Version 3.4.07