4QT — Hybrid Powertrains for Heavy Machinery

Autonomy ready.
We have the power.

We build hybrid electric powertrains that work with the heavy machinery of today. Every 4QT system is drive-by-wire from the ground up — the instant-torque, software-controlled backbone that autonomous machines demand. Future-proof your fleet without sending it to the scrap heap.

100%
Drive-by-wire
150 kW
Peak drive power
<5 min
Recharge / refuel
4
Product lines
01 — Product Lines

One architecture,
four powertrains

From fully electric to diesel-hybrid range extension — every line shares the same control stack, so the machine you electrify today is the machine you automate tomorrow.

4QT iBEX axial flux motor
Drive Type: Electric In Service

iBEX

Proudly powering the world's first fully electric 8T dumper. Pure electric drive means full software authority over every newton-metre — autonomy ready out of the box.

  • 400V 4QT battery pack
  • 10C peak symmetric charge and discharge
  • 6C continuous symmetric charge and discharge
  • Power outlet optional for auxiliary tools — power on tap, wherever the machine goes
  • All software, remote diagnostics and servicing included
Vehicle class (unladen)2–4 T
Drive motor power (peak)80 kW
Capacity30 kWh
Recharge 0–100%<10 min
Drive Type: Hybrid Electric In Service

iREX MK I

Taking your worksite to the next level: our proprietary iREX MK I diesel-hybrid system keeps the power flowing wherever the mission goes — no grid, no downtime, no compromise on control.

  • 20% extended range vs iBEX — power that outlasts the shift
  • Variable battery sizing to fit all budget requirements and power needs
  • Highly modular system layout — no base-vehicle structural adjustments needed
  • Tunable interface and power delivery: the feel your customers expect from your brand, with the drive-by-wire control autonomy demands
  • Powers all heavy-duty vehicle applications up to 8T fully loaded
Vehicle class (unladen)2–4 T
Drive motor power (peak)80 kW
Capacity (incl. range extender)110 kWh
Recharge / refuel 0–100%<8 min
4QT iREX MK I hybrid powertrain
4QT iREX MK II hybrid powertrain
Drive Type: Hybrid Electric New

iREX MK II

Further expanding the segments we serve — and the missions we power. The MK II is the drivetrain behind the CERBERUS UGV: proven where power and autonomy are not optional.

  • 30% improved hybrid electric power and range vs MK I
  • Boosted drive motors for sharp response and superior acceleration, also for vehicles up to 12T fully loaded
  • Instant torque and millisecond-level control — built for autonomous operation
Vehicle class (unladen)3–6 T
Drive motor power (peak)120 kW
Capacity (incl. range extender)145 kWh
Recharge / refuel 0–100%<5 min
Drive Type: Diesel-Electric In Development

iREX MK III

The next class up: diesel-electric power for the heaviest applications, engineered on the same autonomy-ready control architecture as the entire iREX family.

  • Specifications to be announced
Vehicle class (unladen)4–8 T
Drive motor power (peak)150 kW
Recharge / refuel 0–100%<5 min
4QT iREX MK III diesel-electric powertrain
02 — The System

A versatile powertrain built
to supercharge your manufacturing

Four subsystems, one integrated stack. Everything a machine needs to drive itself — and the power to do it all day.

001

Controls & Inverter

Tuneable software and control algorithms, trained on years of combined field and synthetic data. This is the layer autonomy stacks plug into: full drive-by-wire authority over torque, steering and braking.

002

Modular Battery

2× more power-dense LFP or NMC chemistry with continuous AC charge & discharge. Sized to the mission — including a silent, engine-off reserve when the job demands it.

003

Axial Flux Motor

Stackable for all machine types and up to 50% more efficient than alternatives — more usable power from every litre of fuel and every kilowatt-hour, with instant torque on command.

004

Industry 4.0

Underpinned by smart software that optimises performance and balances range extender and EV power in real time. Full telemetry and remote diagnostics — machine health without a mechanic on site.

03 — Trusted By

Swiss quality on your product line

Become the latest company to supercharge the e-line of their heavy-duty segment.

Kästli Menzi Muck Swiss Army Walo

The same power drives the battlefield.

4QT powertrains are the hybrid-electric backbone of the CERBERUS unmanned ground vehicle — silent running, unlimited range, autonomy proven in field trials.

5QT Defence ↗
04 — About Us

We are 4QT and we make
heavy machinery autonomy ready

We collaborate with OEMs, construction contractors and governments to build, sell, and scale advanced powertrains for heavy equipment — the power and control layer that takes a fleet from driven, to drive-by-wire, to driverless.

05 — News & Research

Latest

11/09/2025 Joint Customer Roadshow with OEM Menzi Muck 22/10/2024 A New Hybrid Powertrain with Strategic Military Advantages
Inquiries

Supercharge your powertrain

Looking for a complete vehicle that fulfils your off-highway requirements — or a powertrain that makes your product line autonomy ready? Let's talk.

Get in Touch