SquareD, QO, 100A, 2 pole, 120/240VAC, 10kA, plug in, QO2100 Wall Plate This is a 40 circuits

This is a 40 circuits 200A loadcenter plus breakers package

Single piece brass contact provides longer life and continuous conductivity vs multi-piece riveted styles

:BY-Z4430U

If that date is unknown

or "Low Battery" when the batteries need to be replaced

SquareD, QO, 100A, 2 pole, 120/240VAC, 10kA, plug in, QO2100 Wall Plate This is a 40 circuitsManufacturer : Schneider Electric Type QO Series For use in Square D branded QO residential panels. Cat. No. : QO2100 Dimensions (H x W x L): 3. 5" x 1. 50" x 3" 2 Pole 100 Amp 120 240 Volt Connection : Plug In Phase : 1 Interrupting Rating 10000 Ampere Authentic Square D Product CSA Approved and UL Listed