1370-DC280

The Allen-Bradley 1370-DC280 contactor is an electronically-held DC loop contactor that has been designed for the sole purpose of switching an armature current from a DC drive module to a shunt-looped DC motor. The 1370-DC280 contactor should be used with the right control logic design to allow the contactor to disconnect a motor armature from the DC drive module in case of a power failure or when a stop has been initiated. The 1370-DC280 loop contactor comes with a number of features, like a top-wired design that has all of its power connections on top of the contactor. In addition to this, there are double-break silver cadmium oxide contacts which are weld-resistant for better reliability. The movable contacts have wedged shapes, whereas the stationary contacts come with a distinct fold-back design. During contact opting, the foldback design creates a strong magnetic field that throws the arc from the contact surface, then the arc is cooled and extinguished by its chamber’s surface.

The contact coils in the 1370-DC280 contactor are molded under hot pressure in a thermoset epoxy. This protects the coils against any mechanical damage, as well as against harmful environments. The coils' shunt plate has been designed to impede any magnetic flux until the applied voltage reaches the recommended level. Every coil has its exclusive thermal cutout with a design that allows it to open in case of misapplied voltages or excessive currents. Lastly, the 1370-DC280 contactor has a high-efficiency magnet with a permanent air gap. This air gap cannot be affected by pole face wear or sticking because of residual magnetism. Every magnet lamination in the Allen-Bradley 1370-DC280 loop contactor is coated with phosphate to provide strong resistance to corrosion.