Schaltbau investigated the clearances and creepage distances in the high-voltage relay, then compared these parameters with its own DC contactors. The double pole C294 DC contactor was selected. The C294 has better insulation parameters than the high-voltage relay; but most importantly it has solid contacts that withstand arcing better than a high-voltage relay.<\/p>\n
What does the C294 precharging relay do?<\/p>\n
Before the system is switched on, the capacitors have to be charged. This is done via a separate precharging path \u2013 with a resistor that limits the current flow. The C294 precharging contactor closes the precharging path. Once the capacitors are two-thirds charged, the main contactor is activated. Then the C294 opens the precharging path again.<\/p>\n
Why was the C294 chosen?<\/p>\n
Better clearances and creepage distances than the high-voltage relay<\/p>\n
Rated impulse withstand voltage Uimp up to 12 kV<\/p>\n
Contact pills prevent contact welding<\/p>\n
Note<\/p>\n
Schaltbau also provides the CT power contactor<\/a> as the main contactor in many test bench applications.<\/p>\n ","protected":false},"excerpt":{"rendered":" An automobile manufacturer needed a precharging contactor for their electric motor test benches that could withstand arcing during switch-on. They previously used a high-voltage relay, but its contacts frequently welded. Schaltbau investigated the clearances and creepage distances in the high-voltage … Continued<\/a><\/p>\n","protected":false},"author":1,"featured_media":4228,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[11],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t