Honeywell 621-3502 Description Description Honeywell 12-24V DC Fast Response Input Related products HONEYWELL STD924-A1A-00000-MB.3H+XXXX HONEYWELL 620-1690 HONEYWELL 621-3550 HONEYWELL 620-0053 HONEYWELL 620-3590 HONEYWELL 621-3560