Dwyer Instruments 1910-00 Differential Pressure Switch. 

Pressure Ratings: Max Pressure 45 IN. W.C.  

Surge Pressure 10 PSI. 

Unit with conduit enclosure and cover meet 1 type specs. 

Diaphragm Vertical Electric Rating 

15A 125, 250, 480 VAC. 

1/8 HP 125 VAC. 

1/4 HP 250 VAC. 

K2Y2-BEMST-487