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IEC 61850-3 modular managed rackmount switch – 24× Gigabit copper – 4× Gigabit RJ45 uplinks – 110/220 VDC/VAC input – IEC 62443 cybersecurity – Extended wide -40 to 75°C operation
Moxa Products Supplied To the UK, From the UK
As an official UK distributor of Moxa products since 2014, we at Impulse are proud to be affiliated with Moxa Technical College. Our partnership enables us to provide comprehensive in-house training and first-line technical support, and our team of Industrial Internet of Things (IIoT) specialists are fully equipped to guide you through every step of the process. Whether you require assistance with installation, troubleshooting or anything else, our team is ready to assist you.
Technical Support from Impulse
Our commitment doesn't end with the initial setup—we provide lifelong technical support for the entire range of Moxa products at no extra charge. Count on us to ensure that your network operates at its peak performance throughout its entire lifespan.
The RKS-G4028-4GT-HV-T is a high-availability, full Gigabit managed switch built for substation and heavy industrial backbones. Four fixed 1G RJ45 uplinks provide immediate aggregation capacity. At the same time, three module slots let you scale to as many as 28 Gigabit interfaces using a mix of copper, SFP fibre, or Fast-Ethernet FX cards. Isolated high-voltage power (110/220 VDC/VAC) simplifies deployment in utility and transportation cabinets, and fanless IP30 construction withstands -40 to 75°C operation.
Engineered to IEC 61850-3 and IEEE 1613, the switch resists severe EMI/EMS, ensuring wire-speed forwarding with hardware 1588v2 PTP for precise time synchronisation across protection, measurement, and automation workloads. Rapid resiliency is delivered via Turbo Ring and Turbo Chain with <20 ms recovery (at 250 nodes), complemented by STP/RSTP/MSTP, Link Aggregation (LACP), Loop Protection, and Dual-Homing/Ring Coupling for flexible topologies.
Security follows IEC 62443 principles with secure boot, 802.1X, RADIUS/TACACS+, HTTPS/SSH, ACLs, MAC authentication bypass, sticky MAC, and policy-driven rate limits. Deterministic delivery is maintained using eight hardware queues, IEEE 802.1p/ quality of service, DSCP, VLAN/GVRP, and IGMP Snooping/Querier for multicast control.
Operational efficiency comes from intuitive management (web/CLI), SNMPv1/v2c/v3 with traps/informs, RMON, LLDP, Syslog, SFTP/TFTP, and event alarm relays. Optional ABC-02/03 media streamlines backup/restore and firmware updates, while MicroSD/USB storage aids logging.
From bay controllers to interlocking and traction systems, the RKS-G4028-4GT-HV-T combines HV power flexibility, modular port growth, and substation-class immunity to anchor mission-critical networks with confidence.
Delivery & Returns
We offer a range of delivery options to suit your needs.
UK Mainland
Northern Ireland & Highlands
Ireland
RMA
In order to process returned goods, Impulse Embedded Limited uses an internal RMA system. Before returning goods for any reason, please contact Impulse Embedded Limited (returns@impulse-embedded.co.uk) to request an RMA number. Please confirm the reason for the return of the goods, providing the Serial Number, Product Code, and Impulse Embedded Limited Invoice Number (if known).
When returning goods, please ensure they are suitably packed so as to avoid damage, are in the original packaging, along with all accessories, with the outer packaging marked with the RMA number. It is recommended that you use a signed delivery service, as goods lost in transit are not the responsibility of Impulse Embedded Limited.
Please do not write the RMA number on the goods or on the original packaging. Impulse Embedded Limited may refuse returned goods and return them if they arrive without an RMA number, or not in the original packaging.
Moxa 28 Port Gigabit Modular Managed Ethernet Switch – 4x Gigabit RJ45 Ports – 110V to 220V AC Input
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RKS-G4028-4GT-HV-T
28 Port Gigabit Modular Managed Ethernet Switch – 4x Gigabit RJ45 Ports – 110V to 220V AC Input
A customer in the nuclear sector wished to replace the rack computers at heart of their control system, as critical system components had gone out of support. The control system itself forms part of an essential cog in the nuclear supply chain, and is deployed in numerous locations around the world.