Why Choose an Industrial 4G Router Over a Standard Modem?
Industrial sites—such as pumping stations, field control panels, silos, and substations—do not have access to ADSL or fiber-optic lines. Even when a fixed network is available, it can go down. A 4G cellular connection provides a robust alternative that can be deployed in just a few minutes.
But consumer-grade modems aren’t designed for that. They stop working at -5 °C, have only one SIM slot, no built-in VPN, and no remote management interface. The industrial 4G router addresses these limitations:
- DIN rail format — fits into standard electrical cabinets.
- Extended temperature range — from -20 °C to +70 °C, depending on the model.
- Wide power supply range — 9–48 V DC, tolerates industrial voltage fluctuations.
- Dual SIM — automatically switches to the other SIM if one operator goes down.
- Built-in VPN — OpenVPN or IPSec to secure all access.
- MTBF > 100,000 h — designed to operate maintenance-free for years.
Internet Box vs. Industrial 4G Router: A Comparison
| Critère | Consumer set-top box | Industrial 4G Router |
|---|---|---|
| Connection Type | ADSL / Fixed Fiber | 4G/LTE cellular |
| Temperature range | 0 – 40 °C | -20 – +70 °C |
| Format | Desk / Wall-mounted | DIN Rail / Industrial Wall Mount |
| Number of SIM cards | 0 (fixed WAN port) | 1 or 2 M2M SIM cards |
| Automatic Failover | SIM + WAN | |
| Built-in VPN | OpenVPN / IPSec | |
| Fleet Management | Cloud platform | |
| Carrier-assigned static IP address | Private M2M APN | |
| Expected service life | 3–5 ans | 7–15 ans |
Typical Architecture: Dual-SIM Failover
When the primary carrier is no longer reachable (due to an outage, network congestion, or a dead zone), the router automatically switches to the secondary carrier—without any user intervention, often in less than 30 seconds. Monitoring remains active, and data continues to be transmitted.
Key Features of an Industrial 4G Router
1. Multi-carrier cellular connectivity With two M2M SIM cards and smart firmware, the router selects the best signal. Some models support multi-network SIM cards that connect to the carrier with the strongest signal without changing the card.
2. Built-in VPN The VPN tunnel is the cornerstone of security. It enables remote access to PLCs, HMIs, and meters without opening any incoming ports. Only an encrypted outbound connection is established—the attack surface is minimized.
3. Firewall and Segmentation Industrial routers include firewall rules, VLAN separation, and sometimes packet inspection. This allows the OT network to be segmented from the IT network, in accordance with the NIS2 and IEC 62443 recommendations.
4. Fleet Monitoring Through a cloud-based platform, each router reports its active carrier, signal strength (RSRP, RSRQ), data usage, and VPN status. Alerts are configurable: if a site loses its primary connection, a notification is sent in real time.
Use Cases: Where Should You Deploy an Industrial 4G Router?
The most common applications:
- Pumping stations — flow, level, and pressure monitoring; remote control of pumps.
- MV/LV substations — energy metering, fault detection, and remote protection.
- Agricultural silos — temperature and humidity sensors; overflow alerts.
- Construction sites — temporary connection of HMIs and monitoring systems.
- Building automation systems — monitoring of HVAC, lighting, and meters without Ethernet cabling.
- Vending machines / kiosks — remote maintenance, OTA software updates.
How to Choose an Industrial 4G Router?
Before you buy, check the following:
- Number of SIM cards — single or dual SIM? For critical sites, dual SIM is essential.
- Supported LTE bands — check compatibility with your carrier’s bands (B3, B7, B20 in France).
- Field interfaces — Do you need RS-485 / Modbus? Some routers include them, others do not. The Eziwan Gateway includes RS-485 and Modbus natively.
- VPN — OpenVPN, IPSec, WireGuard? Make sure the protocol is compatible with your infrastructure.
- Temperature — unheated areas, outdoor cabinets: check the operating range.
- Remote management — a REST API or cloud platform is essential for managing more than a few sites.
The Eziwan Approach
The Eziwan Gateway integrates everything an industrial 4G router needs into a single DIN-rail enclosure: an LTE Cat-4/Cat-6 modem, dual M2M SIM slots, a native RS-485 port, OpenVPN/IPSec VPN, and zero-touch provisioning. It pairs with the Eziwan Cloud for fleet monitoring, alerts, and remote diagnostics—without the need for a technician to visit the site.
For critical sites (water, energy, industry), visit our Multi-Carrier M2M SIM page and learn about remote site monitoring.