KR 120 R3900 ultra

The KUKA KR 120 R3900 ultra is a 120 kg payload robot with an extended 3,904 mm reach — the longest in KUKA’s KR QUANTEC ultra family. It is designed for applications requiring reach across very wide work areas: long press lines, extended conveyor transfer sequences, and large part staging areas where a standard-reach robot would require a floor track to cover the necessary distance. The ultra-reach configuration eliminates track complexity while maintaining 120 kg of payload capacity throughout the full work envelope.

The KR 120 R3900 ultra is built on the KR QUANTEC mechanical platform, which provides the structural rigidity needed to maintain accuracy at extended reach distances. IP54 standard with IP65 wrist protection suits the press room and stamping environments where extended-reach robots are most commonly deployed. The QUANTEC series’ servo drive system maintains consistent motion performance at full reach extension, where the mechanical leverage of the extended arm amplifies the demands on joint control.

Operating on the KR C4 controller with smartPAD, the KR 120 R3900 ultra supports KUKA’s full software suite including SafeOperation for monitored zone management at extended reach distances, mxAutomation for PLC integration, and KUKA’s technology packages for material handling and press automation. KUKA.OfficeLite enables offline programming and reach verification simulation — particularly important for extended-reach installations where physical commissioning is complex and time-consuming.

Every KR 120 R3900 ultra that passes through iGAM’s Detroit facility is powered on and run through a full axis evaluation before it ships. Our team reviews alarm history, checks battery backup status, and documents the condition of the controller, teach pendant, and cables. What you receive is a robot that has been verified operational — not simply warehoused and resold. iGAM also offers reconditioning services for customers who own a KR 120 R3900 ultra in need of maintenance, servo evaluation, or refurbishment to restore it to peak performance.