Honeywell 621-4550 Description Description Honeywell 24V DC Source Input Module Related products HONEYWELL DM106-0-A-00-0-R-1-00000-000-E0 HONEYWELL AX51-061-001 HONEYWELL 621-6550 HONEYWELL 620-1690 HONEYWELL 621-9990 HONEYWELL AX51-051-001