Relay switching fluorescent lamp

Discussion in 'General Electronics Chat' started by chchuah, Jun 19, 2009.

  1. chchuah

    Thread Starter New Member

    Jun 19, 2009
    2
    0
    I am using a relay with contact capacity 10A/277VAC and 15A/24VDC as a switch to control 10 fluorescent lamps. I found that the relay life span is decreased tremendously due to the contact welded. Is this due to inrush current and how do I protect the relay contact?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    If the relay contacts weld, the current must be well above the rating. What is the voltage and current requirement for each fluorescent fixture?
     
  3. chchuah

    Thread Starter New Member

    Jun 19, 2009
    2
    0
    Thanks. The fluorescent is rated at 40W each. As I know, it is an inductive load and there are inrush current during start up. How to prevent the relay contact from welded in this case?
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You may need to use multiple relays to spread the inrush current across more contacts.
     
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