You are not registered yet. Please click here to register!


 
 
plc storereviewsdownloads
This board is for PLC Related Q&A ONLY. Please DON'T use it for advertising, etc.
 
Try our online PLC Simulator- FREE.  Click here now to try it.

New Here? Please read this important info!!!


Go Back   PLCS.net - Interactive Q & A > PLCS.net - Interactive Q & A > LIVE PLC Questions And Answers

Reply
 
Thread Tools Display Modes
Old February 11th, 2020, 03:14 PM   #1
Firejo
Member
United States

Firejo is offline
 
Firejo's Avatar
 
Join Date: Jun 2008
Location: Redmond, WA
Posts: 1,429
Spring clamp vs. screw type terminal blocks

OK, some internal "discussion" going on in my world about what is preferred in the industry for a three position connector, a spring clamp type or traditional screw type. I'm starting to see a lot of the spring clamp ones showing up on Rockwell (and others) PLC's so now I'm curious.
This is an "in general" question (not one specific model vs. another).
So, what do you guys prefer (again, in general)?
__________________
Go Hawks!!!

Last edited by Firejo; February 11th, 2020 at 03:16 PM.
  Reply With Quote
Old February 11th, 2020, 03:31 PM   #2
James Mcquade
Member
United States

James Mcquade is offline
 
Join Date: Oct 2007
Location: Tennessee
Posts: 2,891
What are you calling a three position connector?
James
  Reply With Quote
Old February 11th, 2020, 03:40 PM   #3
Firejo
Member
United States

Firejo is offline
 
Firejo's Avatar
 
Join Date: Jun 2008
Location: Redmond, WA
Posts: 1,429
It has three connection points
__________________
Go Hawks!!!
  Reply With Quote
Old February 11th, 2020, 03:57 PM   #4
rQx
Member
Sweden

rQx is offline
 
Join Date: Oct 2010
Location: Trelleborg
Posts: 830
Screw connections for me on everything. Seems like spring clamp connections tend to break more often, have not so accessible meassuring points and smaller connection holes
  Reply With Quote
Old February 11th, 2020, 04:00 PM   #5
Dryhops
Member
United States

Dryhops is offline
 
Join Date: Jan 2018
Location: California
Posts: 83
I'm sure spring type connections are rated for a certain number of insertions, but I often see them bent pretty badly.

I'm sure I'm not the only one who gets frustrated when the spring doesn't release. I prefer screw terminals, even if they take longer.
  Reply With Quote
Old February 11th, 2020, 05:29 PM   #6
Timbert
Member
United States

Timbert is offline
 
Timbert's Avatar
 
Join Date: May 2011
Location: The middle of the Pacific Ocean
Posts: 434
I prefer screw terminals. But then again everything I work on is serial number 000001.

If I was mass producing something with electronic assemblers, I would take spring-loaded.
__________________
An expert is a man who has made all the mistakes which can be made in a very narrow field. --Niels Bohr as quoted by Edward Teller
  Reply With Quote
Old February 11th, 2020, 05:44 PM   #7
OkiePC
Lifetime Supporting Member
United States

OkiePC is offline
 
OkiePC's Avatar
 
Join Date: Mar 2005
Location: ENE of Nowhere Oklahoma
Posts: 10,682
If I have to wire a shedload of them and they're not going into a freezer, spring clamp terminals, otherwise, screw terminals.
__________________
You can choose a ready guide in some celestial voice. If you choose not to decide you still have made a choice.
  Reply With Quote
Old February 11th, 2020, 05:45 PM   #8
Dryhops
Member
United States

Dryhops is offline
 
Join Date: Jan 2018
Location: California
Posts: 83
Quote:
Originally Posted by OkiePC View Post
If I have to wire a shedload of them and they're not going into a freezer, spring clamp terminals, otherwise, screw terminals.
Hmm, the metal contracts significantly and the wires come loose? Just how cold are you talking?
  Reply With Quote
Old February 11th, 2020, 05:55 PM   #9
OkiePC
Lifetime Supporting Member
United States

OkiePC is offline
 
OkiePC's Avatar
 
Join Date: Mar 2005
Location: ENE of Nowhere Oklahoma
Posts: 10,682
Quote:
Originally Posted by Dryhops View Post
Hmm, the metal contracts significantly and the wires come loose? Just how cold are you talking?
Yep, been there and done that. Standing on my head in a -15F freezer working on a tiny j-box with a terminal strip. The 3rd time in a month that I had to go put wires back in the same spot that had fallen out, I switched them to screw terminals and it quit happening.
__________________
You can choose a ready guide in some celestial voice. If you choose not to decide you still have made a choice.
  Reply With Quote
Old February 11th, 2020, 07:50 PM   #10
Archie
Member
United States

Archie is offline
 
Join Date: May 2002
Location: Orangeburg, SC
Posts: 1,925
Quote:
Originally Posted by Dryhops View Post
I'm sure spring type connections are rated for a certain number of insertions, but I often see them bent pretty badly.

I'm sure I'm not the only one who gets frustrated when the spring doesn't release.
I used to see bent springs when using the old style terminals where you had to insert a screw driver into a hole, then bend the correct direction. Some years ago I switched to the terminals with the orange release button, never seen another issue. The same terminals are "push-in" type so they need no tool for insertion. The speed of wiring is drastically faster than screw terminals.

I used to do regular work at a certain facility and they had weekly failures from loose screw terminals or the wire not inserted correctly. After they began phasing into the push-in spring terminals with the release button, I have not seen any failures related to terminals since.
__________________
Expectations lead to disappointment. Appreciation leads to satisfaction.

AdvancedHMI - HMI Software without the license key hassles
  Reply With Quote
Old February 11th, 2020, 07:55 PM   #11
Miguel554
Member
United States

Miguel554 is offline
 
Join Date: Jun 2019
Location: Arizona
Posts: 8
Screw type is the way to go because I wont always have ferrules on me when I'm troubleshooting and need to reland a wire.
  Reply With Quote
Old February 11th, 2020, 08:15 PM   #12
dogleg43
Member
United States

dogleg43 is offline
 
Join Date: Dec 2005
Location: Indiana
Posts: 420
I’m an old fa#t whose negative opinion of spring type terminals was shaped by my experience wiring houses with #12 solid wire and stab-in type receptacles. These failed a lot.

I moved into engineering and design and my opinion changed after using Wago & Phoenix spring clamp terminals for control wiring (stranded #16 & smaller) on some industrial panels. The connections seemed to hold up well and it was a space saver in the panels because less space is required between the terminals and the wiring duct.

Very few of our customers wanted them so most of our projects continued with screw terminals.

My final comment is to just make sure the electricians terminating spring clamp terminals understand how to do it properly.
  Reply With Quote
Old February 11th, 2020, 08:22 PM   #13
Bit_Bucket_07
Member
United States

Bit_Bucket_07 is offline
 
Bit_Bucket_07's Avatar
 
Join Date: Feb 2013
Location: Southeast US
Posts: 1,609
Quote:
Originally Posted by dogleg43 View Post
I’m an old fa#t whose negative opinion of spring type terminals was shaped by my experience wiring houses with #12 solid wire and stab-in type receptacles. These failed a lot.

I moved into engineering and design and my opinion changed after using Wago & Phoenix spring clamp terminals for control wiring (stranded #16 & smaller) on some industrial panels. The connections seemed to hold up well and it was a space saver in the panels because less space is required between the terminals and the wiring duct.

Very few of our customers wanted them so most of our projects continued with screw terminals.

My final comment is to just make sure the electricians terminating spring clamp terminals understand how to do it properly.

That's the trick. Screw terminals are superior if installed by a skilled technician, but spring-loaded terminals may (or, may not?) be more dummy-proof.
__________________
  Reply With Quote
Old February 11th, 2020, 11:03 PM   #14
dogleg43
Member
United States

dogleg43 is offline
 
Join Date: Dec 2005
Location: Indiana
Posts: 420
Quote:
Originally Posted by James Mcquade View Post
What are you calling a three position connector?
James
Maybe a 3-level terminal block? These are very convenient for 3-wire proximity sensors, etc.
  Reply With Quote
Old February 12th, 2020, 01:08 AM   #15
Firejo
Member
United States

Firejo is offline
 
Firejo's Avatar
 
Join Date: Jun 2008
Location: Redmond, WA
Posts: 1,429
Quote:
Originally Posted by dogleg43 View Post
Maybe a 3-level terminal block? These are very convenient for 3-wire proximity sensors, etc.
This would be a three position terminal block

https://www.alliedelec.com/product/p...7022/70054840/
__________________
Go Hawks!!!
  Reply With Quote
Reply
Jump to Live PLC Question and Answer Forum

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Topics
Thread Thread Starter Forum Replies Last Post
terminal block technology MNJ96 LIVE PLC Questions And Answers 23 February 17th, 2020 05:49 PM
Rotary Index Table app. gpdc LIVE PLC Questions And Answers 1 September 20th, 2007 01:22 PM
Air compressor screw type - questions leitmotif LIVE PLC Questions And Answers 7 September 11th, 2007 06:02 AM
melsec type A0J2 and MAC E200 terminal? ason LIVE PLC Questions And Answers 10 January 17th, 2007 01:22 PM
OT Cage Clamp Terminals MikeW LIVE PLC Questions And Answers 15 January 19th, 2005 09:29 AM


All times are GMT -4. The time now is 06:59 AM.


.