Honeywell 621-3560 Description Description Honeywell 16 Point 24 V DC Input Related products HONEYWELL 621-3550 HONEYWELL 621-0009 HONEYWELL 621-2200 HONEYWELL 621-0010 HONEYWELL 620-1690 HONEYWELL DC3002-0-20A-2-89-0111-EN