Honeywell 621-1251 Description Description Honeywell 16 Point 240V AC Input Isolated Related products HONEYWELL STD924-A1A-00000-MB.3H+XXXX HONEYWELL 621-2200 HONEYWELL 620-0041 HONEYWELL 620-0053 HONEYWELL 621-3580 HONEYWELL 620-3691C