| ??? 01/16/06 14:04 Read: times |
#107492 - Varistor Responding to: ???'s previous message |
Raja said:
what are the precautions to be taken for using a relay to switch (230v ac power lines) In order to achieve a long life for the relay contacts a varistor should be used: Use a relay which switchs-off the load at phase and neutral. Then, connect a varistor across phase and neutral on the load side. When you switch-off the load and there comes some inductance into play, then the varistor and its parasitic capacitance of about 1nF helps the relay contacts from becoming eroded. Use a 275V varistor and connect a series circuit of two 1M resistors in parallel to it. Kai |
| Topic | Author | Date |
| surge/spike suppression?? | 01/01/70 00:00 | |
| Depends on the circuit | 01/01/70 00:00 | |
| Varistor again | 01/01/70 00:00 | |
| where should i connect the varistor? | 01/01/70 00:00 | |
At input of transformer | 01/01/70 00:00 | |
| Varistor | 01/01/70 00:00 | |
| Connect a fuse.. | 01/01/70 00:00 | |
| Of course!! | 01/01/70 00:00 |