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  1. #1
    dr5chrome's Avatar
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    Patterson 2000D Enlarger timer

    Patterson 2000D - Anyone know the Watt handling capability of this timer? Doesn't seem to be listed anywhere.

    thanks - dw

  2. #2

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    This is rated for a maximum of 5 amperes.

    Watts = VA = 120 volts*5 amperes = 600 watts. (US & Canada current is 60Hz, nominally 120v)

    http://www.bhphotovideo.com/c/produc...oom_Timer.html

  3. #3
    dr5chrome's Avatar
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    thanks

  4. #4
    Nicholas Lindan's Avatar
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    The incandescent rating of a relay is often 1/5 or so of the amperage rating. The reason being that an incandescent lamp is close to a dead short when it is first turned on and it pulls a huge amount of current until it warms up. This turn-on current burns the relay contacts and can weld the contacts shut if the load is high enough.

    A relay that can switch a 12A heating load is usually rated for 200W incandescent load.

    I don't know the rating of the Patterson's relay, but if the fuse rating is 5A then I would guess they expect a 200W maximum incandescent lamp load and the relay contacts are rated at 10-12 amps.

    If you have a 300W+ lamp then you should use a remote contactor - a very heavy duty relay: http://www.mcmaster.com/#general-purpose-relays/=m4xint
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm



 

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