The SD-N300 DC24V is a replacement coil designed specifically for the D-N300 frame of magnetic direct-on-line (DOL) contactors. It supplies the necessary magnetic force to pull in and hold the main contacts when your control circuit is at 24 VDC.
Installing or swapping
This coil wires straight onto the D-N300 contactor base — same terminal layout, same mounting slots. The 24 VDC rating matches a standard panel control transformer or PLC output; verify polarity on DC coils if your contactor has freewheeling diode suppression, otherwise reverse-polarity protection is internal.