Patterson 2000D Enlarger timer

[dr5chrome]

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

thanks - dw

 

[Ian C]

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/product/245871-REG/Paterson_PTP745U_2000D_Darkroom_Timer.html

 

[dr5chrome]

thanks

 

[Nicholas Lindan]

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