RS shredder series refined for greater uptime, control, and efficiency

With more RS shredders in operation worldwide than any other UNTHA machine, this four-shaft workhorse is a genuine staple of the waste and recycling market. Trusted for volume reduction, material liberation, and precise particle sizing across a wide range of complex streams – from WEEE and confidential documents to metal swarf, plastic packaging, IBC drums, and automotive parts – the RS has continued to evolve since its original launch many decades ago.

Now, we’re taking it even further. To meet the demands of an industry that never stands still, the RS range has been comprehensively redesigned with several major innovations to improve strength, versatility, control, uptime, efficiency, and cost. Here, we explore exactly what’s new.

A bold exterior built with impact

The RS Series 4 arrives with a refreshed aesthetic, marked by a distinctive new hopper colour unique to this generation. But the refresh is not simply about visual appeal. LED status lighting on the control panel gives operators an at-a-glance read on machine availability, while a more solid, torsion-resistant construction adds structural resilience for long-term durability in demanding environments. Every element of the redesign has been considered with the operator in mind, from the shop floor up.

Enhanced throughput performance

Throughput performance has always been a strength of the RS. In the Series 4, it’s been pushed further still. Targeted adaptations to the screen body and cutting system symmetry reduce clogging, improve material flow, and deliver a more homogenous output than any previous generation. For operators, this consistency matters – it keeps downstream systems running efficiently, reduces the risk of process interruptions, and puts greater confidence behind every shred, regardless of what material you’re running through the machine.

Fewer parts for straightforward maintenance

Sometimes, the most impactful engineering decisions are the simplest, designed to remove complexity rather than add it. The RS Series 4 features a direct drive across all models, which significantly reduces the number of wear parts within the machine. Fewer components means fewer potential failure points, lower spare parts costs, and a more straightforward maintenance experience day to day. Perhaps most importantly, the lifetime cost is reduced because of this, meaning that, over time, you’ll save more money than if you’d opted for a competitor shredder. Furthermore, all routine servicing can now be carried out with non-specialist tooling, reducing dependency on external engineers and keeping your operation moving.

30% faster screen changes to cut downtime

Maintenance windows are an unavoidable reality in any shredding operation, ensuring equipment operates at peak performance. What isn’t inevitable is how long they take. The integrated quick-change screen system in the RS Series 4 cuts screen change times by up to 30% compared to older models – a seemingly simple improvement that has a direct and measurable impact on operational efficiency. Less time spent on the machine means more time processing material, and stronger uptime figures across the board.

Quieter operations that boost health and safety

Operator wellbeing is a central priority that cannot be overlooked. The RS Series 4 delivers a genuine, measurable improvement here – noise levels have been reduced by 8%, bringing the machine down to as low as 74dB(A). This not only supports compliance with occupational health and safety requirements, but also improves day-to-day working conditions for machine operators and broadens the range of site environments where the RS Series 4 can be deployed.

A reimaged core for long-term reliability

The mechanical foundations of the RS Series 4 have been enhanced with longevity in mind. Upgraded mechanical sealing now offers far greater protection for the bearings, extending service intervals and reducing the frequency of maintenance interventions. New IE3 motors improve energy efficiency across the full model range. Plus, every RS Series 4 comes with an extended three-year warranty as standard – a reflection of the confidence placed in this new generation of engineering, and a meaningful assurance for operators planning long-term.

Intelligent monitoring with UNTHA GENIUS

UNTHA’s data-driven software platform GENIUS – already well established on the XR and ZR ranges – is now available on the RS Series 4 for the first time. It collects real-time process data from the machine, generates productivity forecasts, and supports proactive maintenance planning before issues escalate into downtime. Remote diagnostics with SMS alerts add another layer of operational confidence, meaning your team can be notified of developing faults or performance changes instantly, without needing to be on site. An enhanced touchscreen interface, integrated machine hours counter, and a control system upgraded to EN 13849-1 PLd complete a package that puts operators genuinely in control of their machine and their output.

Configurable for the most demanding applications

No two shredding operations are the same, and the RS Series 4 has been designed with this reality in mind. Available across six models – RS30, RS40, RS50, RS60, RS100, and RS150 – the machine can be specified with a range of optional enhancements, fully configurable to suit your exact requirements. Available options include longer-lasting mechanical seals for enhanced bearing protection, wear plates for resilience against abrasive inputs, digital oil level monitoring with automatic shut off, pre-tensioned cutting discs to guard against unshreddables, and shaft ventilation to reduce contamination within the cutting system.

Ready to find the right shredding solution?

Whether you need a standalone RS Series 4 or a fully integrated turnkey shredding line designed around your site, our team works closely with you from the outset to make sure the solution genuinely fits. No matter what, our goal is to help you strengthen performance, minimise disruption, and maximise returns for years to come.

If you’d like to see the RS Series 4 before committing, we’d love to show you what it can do. At our Boroughbridge HQ, you can book a demo and trial your own materials for free – there’s no better way to understand the output quality and throughput capability firsthand. Plus, with our flexible finance and hire options, accessing industry-leading shredding technology doesn’t have to mean a significant upfront investment.

Get in touch with our team to talk through your unique requirements.