60
Relay Contacts: Protective Wiring
1
2
3
1
2
3
Typical AC applications
with inductive load
1 Load
2 RC combination, e.g. RIFA PMR 209
Typical RC combinations
e.g.
capacitor 0.1 µF
resistor 100 ohms / 1 W
3 Contact
Caution!
Make sure that the maximum ratings of the relay contacts are not exceeded
even during switching!
Protective wiring of relay contacts
Relay contacts are subject to electrical erosion. Especially with inductive and
capacitive loads, the service life of the contacts will be reduced. For suppres-
sion of sparks and arcing, components such as RC combinations, nonlinear
resistors, series resistors and diodes should be used.
Information concerning relay contacts
As delivered, the relay contacts are suitable for low signal currents (down to
approx. 1 mA). If currents above approx. 100 mA are switched, the gold plating
is destroyed during the switching process. After that, the contacts will not
reliably switch low currents.
Содержание Protos 3400
Страница 12: ...12 ...
Страница 160: ...160 ...
Страница 177: ...177 Appendix Buffer Table Mettler Toledo ...
Страница 179: ...179 Appendix Buffer Table DIN 19267 ...
Страница 181: ...181 Appendix Buffer Table Techn Buffers to NIST ...
Страница 182: ...182 Appendix Buffer Table Hamilton ...
Страница 183: ...183 Appendix Buffer Table Kraft ...
Страница 184: ...184 Appendix Buffer Table Hamilton A ...
Страница 185: ...185 Appendix Buffer Table Hamilton B ...
Страница 186: ...186 Appendix Buffer Table HACH ...
Страница 206: ...206 Index ...
Страница 207: ...207 Index ...