Difference between revisions of "General Rules for Dimensioning of Contacts"

From Electrical Contacts
Jump to: navigation, search
(→‎6.4.6 General Rules for Dimensioning of Contacts)
(18 intermediate revisions by 3 users not shown)
Line 1: Line 1:
−
===<!--6.4.6-->General Rules for Dimensioning of Contacts===
+
===6.4.6 General Rules for Dimensioning of Contacts===
  
−
'''Recommended Minimum Contact Forces at Slightly Sliding Contact Make:'''
+
*'''Recommended Minimum Contact Forces at Slightly Sliding Contact Make:'''
  
−
<table class="twocolortable" style="text-align: left; font-size: 12px;width:40%">
+
{| class="twocolortable" style="text-align: left; font-size: 12px;width:40%"
−
<tr>
+
|-
−
<td>Gold</td>      
+
|Gold       
−
<td>0.03 N </td>
+
|0.03 N
−
</tr><tr>
+
|-
−
<td>Silver </td>
+
|Silver  
−
<td>0.1 N</td>
+
|0.1 N
−
</tr><tr>
+
|-
−
<td>Tungsten  </td>
+
|Tungsten   
−
<td>0.5 N</td>
+
|0.5 N
−
</tr>
+
|-
−
</table>
+
|}
  
−
'''Contact Force Recommendations:'''
+
*'''Contact Force Recommendations:'''
  
 
{| class="twocolortable" style="text-align: left; font-size: 12px;width:40%"
 
{| class="twocolortable" style="text-align: left; font-size: 12px;width:40%"
Line 46: Line 46:
  
  
−
'''General Rules for Dimensioning of Contact Rivets'''
+
*'''General Rules for Dimensioning of Contact Rivets'''
  
−
[[File:General Rules for Dimensioning of Contact Rivets.jpg|left|thumb|Figure 1: General Rules for Dimensioning of Contact Rivets]]
+
[[File:General Rules for Dimensioning of Contact Rivets.jpg|left|thumb|General Rules for Dimensioning of Contact Rivets]]
 
{| class="twocolortable" style="text-align: left; font-size: 12px;width:100%"
 
{| class="twocolortable" style="text-align: left; font-size: 12px;width:100%"
 
|-
 
|-
Line 76: Line 76:
 
|}
 
|}
  
 +
*'''Head diameter for electrical loads'''
  
 +
{| class="twocolortable" style="text-align: left; font-size: 12px;width:40%"
 +
|-
 +
|For AC currents:   
 +
|approx. 1 – 1.5 A/mm²
 +
|-
 +
|For 1 A 
 +
|min. 2 mm head diameter
 +
|-
 +
|10 A 
 +
|approx. 3 – 3.5 mm head diameter
 +
|-
 +
|20 A 
 +
|approx. 5 mm head diameter
 +
|-
 +
|For DC currents:
 +
|approx. 0.5 – 0.8 A/mm²
 +
|}
  
 +
*'''Head radius R for electrical loads'''
  
−
 
+
{| class="twocolortable" style="text-align: left; font-size: 12px;width:40%"
−
'''Failure Probability of Single and Double (Bifurcated) Contacts''' (according to Thielecke)
 
−
 
 
−
{| class="twocolortable" style="text-align: left; font-size: 12px;width:100%"
 
 
|-
 
|-
−
!Contact force[N]      
+
|for I < 1 A      
−
!colspan="4" style="text-align:center"|'''Single contact'''
+
|R &#8776; 1,5 mm
 
|-
 
|-
−
!    
+
|I = 6 A    
−
!Ag
+
|R &#8776; 5 mm
−
!AuNi 5, Pt
 
−
!Ag
 
−
!AuNi 5, Pt
 
 
|-
 
|-
−
|0.04 
+
|I = 10 A   
−
|
+
|R &#8776; 10 mm
−
|1 x 10<sup>-4</sup>
 
−
|
 
−
|2 x 10<sup>-8</sup>
 
 
|-
 
|-
−
|0.1 
+
|I = 20 A   
−
|2 x 10<sup>-3</sup>
+
|R &#8776; 15 mm
−
|4 x 10<sup>-5</sup>
 
−
|8 x 10<sup>-5</sup>
 
−
|8 x 10<sup>-9</sup>
 
−
|-
 
−
|0.2
 
−
|1 x 10<sup>-4</sup>
 
−
|8 x 10<sup>-6</sup>
 
−
|4 x 10<sup>-6</sup>
 
−
|4 x 10<sup>-8</sup>
 
−
|-
 
−
|0.3
 
−
|5.5 x 10<sup>-6</sup>
 
−
|1.5 x 10<sup>-6</sup>
 
−
|1.8 x 10<sup>-7</sup>
 
−
|3.2 x 10<sup>-10</sup>
 
 
|}
 
|}
  
 +
*'''Failure Probability of Single and Double (Bifurcated) Contacts''' (according to Thielecke)
  
−
<div class="multiple-images">
+
Fig. 6.18: Failure probability of a contact as a
−
<figure id="fig:Failure probability of a contact as a function of the voitage">
+
function of the voltage (according to Kirchdorfer);
−
[[File:Failure probability of a contact as a function of the voitage.jpg|left|thumb|Figure 2: Failure probability of a contact as a function of the voltage (according to Kirchdorfer); Ag/Ni10; 10 mA]]
+
Ag/Ni10; 10 mA
−
</figure>
 
  
−
<figure id="fig:Failure probability of a contact as a function of the current">
+
Fig. 6.19: Failure probability of a contact as a
−
[[File:Failure probability of a contact as a function of the current.jpg|left|thumb|Figure 3: Failure probability of a contact as a function of the current (according to Kirchdorfer); Ag/Ni10; F<sub>k</sub> = 0.45 N; U = 24 V]]
+
function of the current (according to
−
</figure>
+
Kirchdorfer); Ag/Ni10; F = 0.45 N; U = 24 V
−
</div>
 
−
<div class="clear"></div>
 
  
 
==References==
 
==References==
 
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
 
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
−
 
−
[[de:Faustregeln_für_die_Kontaktdimensionierung]]
 

Revision as of 12:00, 2 April 2014

6.4.6 General Rules for Dimensioning of Contacts

  • Recommended Minimum Contact Forces at Slightly Sliding Contact Make:
Gold 0.03 N
Silver 0.1 N
Tungsten 0.5 N
  • Contact Force Recommendations:
Signal relays ≥ 3 cN
AC power relays ≥ 20 cN
Automotive relays ≥ 20 cN
Motor switches (Contactors)
(Silver – Metal oxide contacts) 		0.05 - 0.08 N/A
Power switches 0.1 - 0.2 N/A
Connectors
(Gold coating) 		≥ 30 cN/contact element
Connectors
(Silver coating) 		≥ 50 cN/contact element
Connectors
(Tin coating) 		≥ 1 N/contact element


  • General Rules for Dimensioning of Contact Rivets
General Rules for Dimensioning of Contact Rivets
Dimensioning Solid Rivets (1) Composite Rivets (2)
a : d 1.5 : 1 bis 2.5 : 1 2 : 1 bis 2.5 : 1
a : b 2.5 : 1 bis 10 : 1 3 : 1 bis 5 : 1
c : b ≥ 1 : 1 ≥ 1 : 1
b : s ≥ 2 : 1
smin ≈ 0.3 mm
  • Head diameter for electrical loads
For AC currents: approx. 1 – 1.5 A/mm²
For 1 A min. 2 mm head diameter
10 A approx. 3 – 3.5 mm head diameter
20 A approx. 5 mm head diameter
For DC currents: approx. 0.5 – 0.8 A/mm²
  • Head radius R for electrical loads
for I < 1 A R ≈ 1,5 mm
I = 6 A R ≈ 5 mm
I = 10 A R ≈ 10 mm
I = 20 A R ≈ 15 mm
  • Failure Probability of Single and Double (Bifurcated) Contacts (according to Thielecke)

Fig. 6.18: Failure probability of a contact as a function of the voltage (according to Kirchdorfer); Ag/Ni10; 10 mA

Fig. 6.19: Failure probability of a contact as a function of the current (according to Kirchdorfer); Ag/Ni10; F = 0.45 N; U = 24 V

References

References

Retrieved from "https://www.electrical-contacts-wiki.com/index.php?title=General_Rules_for_Dimensioning_of_Contacts&oldid=2834"