Author Topic: What is a relay with 'LTB'  (Read 1271 times)

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Offline splinTopic starter

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What is a relay with 'LTB'
« on: February 20, 2020, 05:06:12 pm »
I'm pretty sure I don't need one but I am just curious as to what the LTB means - from the picture it looks like a test button but what is it used for?

https://www.lmentesale.com/index.php?main_page=product_info&products_id=173593

[EDIT] I did read the datasheet but it wasn't enlightening
 

Offline splinTopic starter

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Re: What is a relay with 'LTB'
« Reply #1 on: February 20, 2020, 06:52:35 pm »
Lockable Test Button

Ok, thanks, but what does it do when you press the test button - does it operate or release the relay? Where and why would you use one?
 

Offline I wanted a rude username

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Re: What is a relay with 'LTB'
« Reply #2 on: February 21, 2020, 02:09:25 am »
From the Finder 60-series datasheet (emphasis added):

The dual-purpose Finder test button can be used in two ways:

Case 1) The plastic pip (located directly above the test button) remains intact. In this case, when the test button is pushed, the contacts operate. When the test button is released the contacts return to their former state.

Case 2) The plastic pip is broken-off (using an appropriate cutting tool). In this case, (in addition to the above function), when the test button is pushed and rotated, the contacts are latched in the operating state, and remain so until the test button is rotated back to its former position.


To answer your second question, it would be implementation-specific, but could ease testing since the operator could set the relay on and go investigate downstream.
 

Offline splinTopic starter

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Re: What is a relay with 'LTB'
« Reply #3 on: February 21, 2020, 06:48:06 pm »
From the Finder 60-series datasheet (emphasis added):

To answer your second question, it would be implementation-specific, but could ease testing since the operator could set the relay on and go investigate downstream.

Thanks, that makes sense. The Schneider datasheet I looked at was silent wrt the TLB. It seems that the 'L' should stand for latching/latchable more than lockable then - I assumed the latter meant it could be phsically locked for safety purposes, but clearly not.
 


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