Milesight Routers – UR32, UR35, UR75 and UF51
The complete Milesight industrial cellular router range – from compact dual-SIM 4G for space-constrained installations to 5G multi-WAN with edge computing for high-availability sites. All models support the Milesight Development Platform for remote fleet management.
Why Use Milesight Routers for Industrial Cellular Connectivity?
Milesight has built a cohesive industrial router range where the same firmware architecture, management platform, and VPN stack runs across every model from the smallest UR32 to the full-featured UR75. This consistency matters in practice – an engineer familiar with configuring one Milesight router can work productively across the entire range without relearning a different interface or a different set of concepts for each product.
The Milesight Development Platform is the management layer that sits above the hardware estate. Free for up to 10 devices and priced at $1 per device per year for unlimited scale, it provides remote configuration, OTA firmware management, real-time monitoring, comms-loss alerting, and webhook integration with external systems. For deployments of any significant size, this platform capability is as important a selection criterion as the hardware specification itself. See the full explainer at Milesight Development Platform.
Milesight also integrates well with the wider IoT ecosystem through Node-RED on higher-specification models, serial RS232 and RS485 interfaces for legacy equipment integration, and LoRaWAN gateways that share the same platform and management tooling as the router range. The full picture of Milesight hardware including ordering codes and images is at the detailed post Milesight routers – full specification guide.
The Milesight Router Range – Model by Model
UR32 Series – 4G Pro Router
The most widely deployed Milesight model for industrial IoT – compact form factor, dual SIM, RS485 serial interface, and the full VPN stack in a DIN-rail mountable package.
The UR32 is built for industrial sites where serial SCADA and RTU connectivity is a requirement alongside cellular WAN. The RS485 port provides direct Modbus RTU integration with sensors, controllers, and meters without a separate serial server. Digital inputs allow external alarm events – cabinet door, temperature sensor, UPS on battery – to be forwarded as SMS or platform alerts. Three variants cover different antenna, WiFi, and PoE combinations within the same core specification.
- Dual SIM with automatic failover – configure SIM 1 and SIM 2 on different MNOs for genuine WAN diversity
- RS232 and RS485 serial interfaces – direct RTU and sensor integration via Modbus RTU or DNP3 serial
- IPsec IKEv2, OpenVPN, and WireGuard VPN – encrypted tunnels to control centre or cloud platform
- Stateful firewall with per-interface rules and VLAN segmentation
- Python 3.7 SDK for custom on-device scripting – local data processing without cloud dependency
- Digital inputs and outputs for alarm forwarding and relay control
- Operating temperature -40 to +70 degrees C
- DIN-rail and wall mount options
- Remote management via Milesight Development Platform
UR35 Series – 4G Pro Router 5-Port
The UR32 specification extended to a 5-port LAN switch – suited to substation and site applications where multiple devices need to connect through a single cellular WAN router.
The UR35 extends the UR32 with a built-in 4-port LAN switch, providing local Ethernet connectivity for up to four devices – IEDs, RTUs, HMIs, and engineering workstations – through a single router. At a secondary substation or BESS site where multiple pieces of equipment need connectivity, the UR35 removes the need for a separate unmanaged switch. The serial interfaces, VPN capability, and platform integration are identical to the UR32.
- All UR32 specifications including dual SIM, RS232/RS485, VPN, firewall, and digital I/O
- 4-port LAN switch – connect multiple site devices through a single cellular WAN connection
- VLAN support across LAN ports – segment SCADA traffic from engineering access from management traffic
- PoE variant available – power IP cameras or VoIP phones directly from the router LAN ports
- WiFi variant available – local wireless access for site engineers without a separate AP
UR41 Series – 4G Mini Router
The most compact Milesight 4G router – single SIM, minimal footprint, for applications where space is the primary constraint and a single WAN path is acceptable.
The UR41 is the entry point in the Milesight industrial router range. Single SIM limits WAN resilience compared to dual-SIM models, but the compact footprint and lower cost make it appropriate for deployments where the application is less critical or where a separate redundancy mechanism (a secondary device or alternative connectivity path) handles failover. Available in Cat 4 and Cat 1 modem variants – the UR41L uses Cat 1 for lower power consumption at reduced peak throughput.
UR75 – 5G Industrial Router
Milesight’s flagship industrial router – dual SIM 5G NR with multi-WAN aggregation, Node-RED edge computing, and the full enterprise VPN and security stack.
The UR75 is the right choice where primary substation backhaul, high-bandwidth SCADA aggregation, 5G coverage is available at the site, or where a hybrid cellular-plus-Ethernet WAN topology is needed. The Ethernet WAN port allows a leased line or DSL circuit to be configured as primary with 5G cellular on hot standby, giving three independent WAN paths when combined with dual-SIM cellular. Node-RED on the device handles local protocol conversion and edge logic without a separate compute platform.
- 5G Sub-6GHz NR with 4G LTE fallback – protects investment as 5G coverage extends across UK infrastructure corridors
- Dual SIM across 5G and 4G – carrier flexibility as network operator coverage evolves
- Ethernet WAN port for hybrid fibre-cellular or DSL-cellular architectures
- Multi-WAN load balancing and policy-based failover with configurable health check timers
- Embedded Node-RED runtime – visual flow programming for Modbus, MQTT, OPC-UA, and custom protocols on the device
- Full VPN suite – IPsec IKEv2, OpenVPN, WireGuard, GRE – with site-to-site and hub-and-spoke topologies
- SNMP v1/v2c/v3 for integration into existing network management systems
- Remote management via Milesight Development Platform including OTA firmware
For a head-to-head comparison with the Teltonika RUTX50, see the iotportal post Milesight UR75 vs Teltonika RUTX50.
UF51 – Outdoor 5G Router / CPE
IP67-rated outdoor 5G CPE for external pole or wall mounting – brings 5G connectivity to locations where running cable to an indoor router is impractical.
The UF51 is the outdoor companion to the UR75 – the same 5G NR connectivity and Node-RED capability in an IP67 enclosure designed for direct outdoor mounting. Positioning the unit close to the antenna or at height eliminates long coax cable runs and the signal losses that come with them. Power and Ethernet are provided via a single PoE cable back to the building, simplifying the installation. A WiFi 6 variant (UF51-W4) adds dual-band wireless access for sites where local wireless connectivity is also needed.
- IP67 outdoor enclosure – direct mounting on poles, rooftop structures, and building facades
- 5G NR Sub-6GHz with 4G LTE fallback and dual SIM
- PoE input for single-cable power and Ethernet installation
- Node-RED for on-device edge logic and protocol processing
- Integrated antennas eliminate coax cable runs and associated signal loss
UF31 – Compact 5G Dongle
A compact 5G USB dongle for embedded applications and single-board computer installations where a full router form factor is not appropriate.
The UF31 provides 5G connectivity via USB 3.0, making it suitable for single-board computers, edge compute platforms, and custom embedded installations where a standalone router is not needed. For Raspberry Pi and similar SBC deployments requiring 5G connectivity, the UF31 is a compact and straightforward solution.
Quick Selection Guide
Space-constrained cabinet, single WAN path acceptable
UR41 or UR41L – ultra compact, single SIM, serial interface. Cat 1 variant for lower power.
Standard 4G deployment with serial SCADA integration
UR32 – dual SIM, RS232/RS485, Python SDK, full VPN stack. The workhorse for most industrial sites.
Multiple devices on site, 4G WAN
UR35 – dual SIM, 5-port LAN switch, RS232/RS485. One router connects multiple field devices.
5G, high availability, or hybrid cellular-fibre WAN
UR75 – 5G NR, dual SIM, Ethernet WAN port, Node-RED, full VPN. Highest capability indoor model.
Outdoor pole or wall mounting, 5G
UF51 – IP67 outdoor, 5G NR, Node-RED, PoE install. Eliminates coax runs, best signal at height.
Embedded / SBC 5G connectivity
UF31 – USB 5G dongle. Raspberry Pi, edge compute platforms, custom device integration.
Model Comparison
| Model | Cellular | SIM | Serial | LAN ports | Node-RED | Outdoor IP67 |
|---|---|---|---|---|---|---|
| UR41 / UR41L | 4G Cat 4 / Cat 1 | 1 | RS232 or RS485 | 1 | – | – |
| UR32 | 4G LTE Cat 4 | 2 | RS232 + RS485 | 1 | – | – |
| UR35 | 4G LTE Cat 4 | 2 | RS232 + RS485 | 4 | – | – |
| UR75 | 5G NR + 4G | 2 | – | 4 + Eth WAN | Yes | – |
| UF51 | 5G NR + 4G | 2 | – | 2 | Yes | Yes |
| UF31 | 5G NR | 1 | – | – | – | – |
Common Capabilities Across the Range
Every model in the Milesight router range shares a common set of capabilities that define the Milesight approach to industrial connectivity.
VPN – IPsec, OpenVPN and WireGuard
All Milesight routers support IPsec IKEv2, OpenVPN, and WireGuard VPN protocols. This is not an optional feature or a licensed add-on – it is standard capability across every model. For industrial IoT applications where operational data must travel encrypted between the field device and the control centre or cloud platform, the VPN stack is a baseline requirement. WireGuard is increasingly the preferred protocol for new deployments due to its performance advantage and simpler configuration compared to IPsec and OpenVPN.
Stateful Firewall and Network Segmentation
Per-interface firewall rules, VLAN support, and the ability to close unused ports and services from first boot. NIS and NCSC CAF requirements for industrial IoT cybersecurity expect network segmentation – SCADA traffic isolated from management traffic from IT networks – as a baseline. Milesight routers support this architecture natively without additional hardware.
Milesight Development Platform Integration
All models connect to the Milesight Development Platform via a simple authentication code entry in the router web GUI. Once connected, the router is visible in the platform dashboard for remote configuration, OTA firmware updates, real-time monitoring, and alert configuration. The $1 per device per year Professional tier pricing makes platform management economically straightforward even for large fleets.
Milesight Routers and SIM Selection
Dual-SIM capability is only as useful as the SIM strategy that goes with it. SIM 1 and SIM 2 on the same operator provides no resilience against a network-level outage. The right configuration for critical applications is SIM 1 and SIM 2 on different mobile network operators – independently tested at the deployment location before installation. A multi-network roaming SIM in one or both slots adds a further layer of coverage resilience on a single SIM card.
For Milesight router deployments that require direct inbound access to the device – SCADA polling, CCTV access, or direct management without a platform – a fixed IP SIM is needed. For everything managed through the Milesight Development Platform, a standard dynamic IP SIM is sufficient since all platform traffic is outbound from the router.
For full guidance on M2M SIM selection for Milesight router deployments, see the industrial SIM cards guide, the fixed IP SIM explainer, and the multi-network SIM guide.
- IoT Antenna – antenna selection guide for Milesight routers and cellular IoT devices
- 5G FWA – 5G Fixed Wireless Access using Milesight UR75 and UF51 hardware
- 5G RedCap – 5G RedCap as the next generation of industrial IoT cellular hardware
- eUICC Explained – eSIM remote profile management for Milesight router deployments
- IoT SIMs – M2M SIM cards for Milesight router deployments
- Multi Network SIM – multi-network SIM options for dual-SIM Milesight routers
Milesight Hardware, Platform and Connectivity
Full specifications, LoRaWAN gateways, SIM guidance and sector applications across IoT Portal.