Honeywell 621-3580 Description Description Honeywell 320 Point 24V DC Input Related products HONEYWELL STD924-A1A-00000-MB.3H+XXXX HONEYWELL AX51-061-001 HONEYWELL 621-3550 HONEYWELL 620-1690 HONEYWELL 621-9990 HONEYWELL 621-0009