Question 1

Can i put this into a nema plastic enclosure box or does in need more ventilation? does the transformer create much heat?

Accepted Answer

No I would not put it in any enclosure. The transformer does not seem to generate much heat and after all it is outside and well ventilated.

Question 2

Is this a compatible replacement for a Siemens D70637.009 contactor?

Accepted Answer

The Siemens D70637.009 is a 1P contactor rated for 40A motor load. Depending on the option chosen this contactor is 1P, 2P, 3P rated for 30A, 32A, 40A motor load. The correct choice for a a form fit and function replacement is the 1P 40A contactor https://www.amazon.com/dp/B08PZFPQTR/  
    I would caution any purchaser not to rely on the UL LISTED markings shown on the paper label. A UL listed part should have a UL file number of the form E123456 directly below the word "LISTED". The UL file number can be checked on the UL site to to find out if the particulars match the product offered and if there have been any problems with the parts or counterfeit parts. The Siemens component is UL RECOGNIZED meaning that the part itself has only been investigated and approved as a generic replaceable component for use in larger assemblies that  are UL Listed. The part itself may or may not have sufficient safety protections for use in other applications.
    The other specifications LRA, 240 locked rotor amperes rating, and resistive load 50 amperes are also the same. The locked rotor amperes rating is the motor starting inrush current. An undersized contactor tends to burn up its contacts over time. What isn't available from the specs are the coil insulation ratings, operating details like unsealed (initial) coil VA, sealed (continuous) coil VA, actuation time for close/open. The coil insulation ratings are more important if the point of use is very hot, e.g. in a rooftop unit. The others shouldn't matter if the control transformer is properly sized and in good condition (test it, a weak transformer can destroy contactors). The only other differences are at the 1/4" Faston contacts. The Siemens contactor is yellow zinc plated steel, which provides limited corrosion protection, with an extended insulating dividers on the housing. This contactor appears to have solid copper Faston contacts which would be more corrosion resistant, but the Chinese language doesn't distinguish between what a product looks like and what it is and the translated description would be the same for a copper plated steel contact which is less corrosion resistant than yellow zinc. The insulating dividers on the housing are the traditional size that only considers the block contacts, and not the Faston add-ons. I don't think I've seen a control box so crowded that larger insulating dividers were necessary.

Question 3

Will this work for Carrier model# ca16na061-a ?

Accepted Answer

The carrier contactor for that model is HN51KC024, a 1 pole 30A contactor, the other pole is a copper strap.  A 30A 2 pole contactor is a suitable replacement for a 30A 1 pole contactor..

Question 4

Is ut normaly closed?

Accepted Answer

Normally open

BOJACK 2 Poles FLA 30 Amp Coil 24 VAC Air Conditioner Condenser Compressor Contactor Motor Definite Purpose AC Contactor (Pack of 1 Pcs)

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