Honeywell 621-4550 Description Description Honeywell 24V DC Source Input Module Related products HONEYWELL 621-0010 HONEYWELL AX51-051-001 HONEYWELL 621-3550 HONEYWELL C7027A1031 HONEYWELL 620-1690C HONEYWELL DC3002-0-20A-2-89-0111-EN