Difference between revisions of "General Rules for Dimensioning of Contacts"
From Electrical Contacts
(→6.4.6 General Rules for Dimensioning of Contacts) |
(→6.4.6 General Rules for Dimensioning of Contacts) |
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*'''Recommended Minimum Contact Forces at Slightly Sliding Contact Make:''' | *'''Recommended Minimum Contact Forces at Slightly Sliding Contact Make:''' | ||
| − | {| class="twocolortable" style="text-align: left; font-size: 12px;width: | + | {| class="twocolortable" style="text-align: left; font-size: 12px;width:40%" |
|- | |- | ||
|Gold | |Gold | ||
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*'''Contact Force Recommendations:''' | *'''Contact Force Recommendations:''' | ||
| − | Signal relays | + | {| class="twocolortable" style="text-align: left; font-size: 12px;width:40%" |
| − | AC power relays | + | |- |
| − | Automotive relays | + | |Signal relays |
| − | Motor switches (Contactors) 0.05 - 0.08 N/A | + | |≥3 cN |
| − | + | |- | |
| − | Power switches 0.1 - 0.2 N/A | + | |AC power relays |
| − | Connectors > 30 cN/contact element | + | |≥ 20 cN |
| − | ( | + | |- |
| − | + | |Automotive relays | |
| − | ( | + | |≥ 20 cN |
| − | + | |- | |
| − | + | |Motor switches (Contactors)<br />(Silver – Metal oxide contacts) | |
| + | |0.05 - 0.08 N/A | ||
| + | |- | ||
| + | |Power switches | ||
| + | |0.1 - 0.2 N/A | ||
| + | |- | ||
| + | |Connectors<br />(Gold coating) | ||
| + | |≥ 30 cN/contact element | ||
| + | |- | ||
| + | |Connectors<br />(Silver coating) | ||
| + | |≥ 50 cN/contact element | ||
| + | |- | ||
| + | |Connectors<br />(Tin coating) | ||
| + | |≥ 1 N/contact element | ||
| + | |} | ||
| + | |||
*'''General Rules for Dimensioning of Contact Rivets''' | *'''General Rules for Dimensioning of Contact Rivets''' | ||
Revision as of 11:19, 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
bild
- 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
