KR 120 R3900-2 K vs KR 280 R3100-2

Side-by-side comparison of KR 120 R3900-2 K (KUKA Robotics) and KR 280 R3100-2 (KUKA Robotics) — specs, pricing, Robo Index, and verified deployments. Updated daily.

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Optimized for Healthcare & Hospitals buyers. Priority specs lifted to the top and marked with a target.

KR 120 R3900-2 KAAA

KR 280 R3100-2A

Layer 1: Identity & Trust

Manufacturer Country

KR 120 R3900-2 KGermany
KR 280 R3100-2Germany

Year First Available

KR 120 R3900-2 K2015
KR 280 R3100-2—

Verified Deployments

KR 120 R3900-2 K0 Deployments
KR 280 R3100-20 Deployments

Layer 2: Operational

Price

KR 120 R3900-2 K$19,000–$84,900 USD
KR 280 R3100-2Contact for quote

Availability Status

KR 120 R3900-2 KACTIVE
KR 280 R3100-2ACTIVE

Arm Mechanics

Repeatability

KR 120 R3900-2 K±0.04 mm
KR 280 R3100-2±0.08 mm

IP Rating (Arm)

KR 120 R3900-2 KIP65
KR 280 R3100-2IP65

Reach

KR 120 R3900-2 K3,904 mm
KR 280 R3100-23,100 mm

Payload

KR 120 R3900-2 K146 kg
KR 280 R3100-2280 kg

Degrees of Freedom

KR 120 R3900-2 K6
KR 280 R3100-26

Robot Weight

KR 120 R3900-2 K42 kg
KR 280 R3100-21,687 kg

IP Rating (Wrist)

KR 120 R3900-2 KIP67
KR 280 R3100-2—

Controller & Programming

Controller Model

KR 120 R3900-2 KKR C5, KR C5 micro
KR 280 R3100-2KR C5, KR C5 micro

Commercial

Price (USD)

KR 120 R3900-2 K$19,000–$84,900 USD
KR 280 R3100-2Contact for quote

Warranty

KR 120 R3900-2 K2 yrs
KR 280 R3100-2—

Service Network

KR 120 R3900-2 Kglobal
KR 280 R3100-2—

	KR 120 R3900-2 Kindustrial-armKUKA Robotics AAARobo Index	KR 280 R3100-2industrial-armKUKA Robotics ARobo Index
Layer 1: Identity & Trust
Manufacturer Country	Germany	Germany
Year First Available (values differ)	2015	—
Verified Deployments	0 Deployments	0 Deployments
Layer 2: Operational
Price (values differ)	$19,000–$84,900 USD	Contact for quote
Availability Status	ACTIVE	ACTIVE
Layer 3: Category Specific
Arm Mechanics
Repeatability (priority for Healthcare & Hospitals buyers) (values differ)	±0.04 mm	±0.08 mm
IP Rating (Arm) (priority for Healthcare & Hospitals buyers)	IP65	IP65
Reach (priority for Healthcare & Hospitals buyers) (values differ)	3,904 mm	3,100 mm
Payload (values differ)	146 kg	280 kg
Degrees of Freedom	6	6
Robot Weight (values differ)	42 kg	1,687 kg
IP Rating (Wrist) (values differ)	IP67	—
Controller & Programming
Controller Model	KR C5, KR C5 micro	KR C5, KR C5 micro
Commercial
Price (USD) (values differ)	$19,000–$84,900 USD	Contact for quote
Warranty (values differ)	2 yrs	—
Service Network (values differ)	global	—

Insufficient data for full comparison

The following fields had no data for any of the selected robots: Battery / Shift Runtime, Path Accuracy, Max TCP Speed, Cycle Time (25/305/25), MTBF, Duty Cycle, Vibration Damping, Safety Category, Dual Check Safety, Safety I/O Pairs, E-Stop Response, Safe Zone Count, Programming Languages, Teach Pendant Type, Offline Programming, Digital Twin Support, Communication Protocols, ROS-Industrial Support, IoT / Cloud Platform, Cybersecurity Certs, Predictive Maintenance, Tool Flange Standard, Tool Changer (ISO), Internal Cable Routing, Pneumatic Lines, Electrical Lines, Spare Parts Lead Time, Expected Service Life

best in categoryweakest in categoryvalues differ

ROI Comparison

Same operating assumptions across every robot — the only difference is price. Set your numbers once to see which pays back fastest.

Robots (fleet)

Hours / day

Labor $/hr (USD)

Days / year

Annual labor displaced (per robot): $50,000

Metric	KR 120 R3900-2 K	KR 280 R3100-2
Investment	$51,950	No price
Payback period	12.5 mo	—
Net savings (5 yr)	$198,050	—
ROI (5 yr)	+381%	—

KR 280 R3100-2 has no listed price, so payback can't be computed. Contact the manufacturer for a quote.

Estimates labor-cost displacement only — not a full total cost of ownership. Actual ROI depends on integration, maintenance, training, downtime, and task fit. Converted currencies are indicative; USD is the price of record.

Trade-offs at a glance

Frequently asked

Who makes KR 120 R3900-2 K and KR 280 R3100-2?

KR 120 R3900-2 K is made by KUKA Robotics, based in DE. KR 280 R3100-2 is made by KUKA Robotics, based in DE.

How do KR 120 R3900-2 K and KR 280 R3100-2 compare on the Robo Index?

KR 120 R3900-2 K grades AAA on the Robo Index. KR 280 R3100-2 grades A. The Robo Index is a credibility grade (AAA … C) that blends commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.

How does the reach of KR 120 R3900-2 K compare to KR 280 R3100-2?

KR 120 R3900-2 K has a reach of 3904 mm. KR 280 R3100-2 has a reach of 3100 mm.

Are KR 120 R3900-2 K and KR 280 R3100-2 in the same category?

Both robots are classified as Industrial Arm on Robolist. Filters and ranking treat them as direct alternatives.

What is the realistic total cost of ownership for Industrial Arm robots?

Hardware cost is one input. Industrial Arm TCO also includes integration, training, downtime, and end-of-life. Our breakdown: TCO of a 6-Axis Arm Cell: Hardware, EOAT, Integration, Programming.

What should a buyer ask vendors when choosing between KR 120 R3900-2 K and KR 280 R3100-2?

Spec sheets only show part of the story. Useful vendor questions cover support, lifecycle, integration cost, and references. We have a buyer-focused checklist: Industrial Arm Vendor Selection: Capability Matrices and Proof Points.

Going deeper — picking the right robot

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About this comparison

KR 120 R3900-2 K vs KR 280 R3100-2 compares two robots in the industrial-arm category. All data is sourced from manufacturer spec sheets, verified deployments, and third-party filings; see our methodology for how the Robo Index is calculated.