A substation relay loses its link during a switching surge. A roadside camera drops offline in a heat wave. A packaging line stalls because the network switch in its control cabinet failed after two summers. In each case, the failed component was built for an office, not the field, and industrial Ethernet switches exist to close that gap.
Note: If your next project puts network infrastructure in a substation, roadside cabinet, or factory floor, then the switch you specify decides how often a technician gets called out. Comnet's hardened, NDAA and TAA compliant switches keep cameras, controllers, and sensors online through the heat, surges, and vibration that take office-grade hardware down. Contact Comnet to match the right hardware to your site before the first failure does it for you.
What Is an Industrial Ethernet Switch?
An industrial Ethernet switch is a network switch built to connect Ethernet devices such as PLCs (programmable logic controllers), sensors, IP cameras, and access control panels in harsh environments where standard hardware fails. It does the same core job as any switch, forwarding data between the devices connected to its ports, but every part of it is engineered for heat, cold, vibration, dust, and electrical noise.
Comnet designs and manufactures industrial Ethernet switches for power utilities, transportation switches, physical security, and manufacturing. The lineup is NDAA-compliant, includes Made-in-USA options, and covers managed and unmanaged switches, PoE switches, and substation-rated models. For a product-focused comparison, see our hardened Ethernet switch buyer's guide.
Why Would You Need an Ethernet Switch?
Every Ethernet network needs switches to move data between devices. Ethernet switches learn which device sits on which port and forward traffic only where it needs to go, keeping data transmission efficient and predictable as the network grows.
In industrial networks, the network switch is also the aggregation point for field devices spread across a site. It connects edge equipment to control systems, uplinks network data over fiber to a control room, and often powers the end devices themselves. If it fails, every device on that part of the network goes dark.
Industrial Ethernet vs. Standard Ethernet
Industrial Ethernet uses the same IEEE 802.3 foundation as office Ethernet. Frame format, cabling, and transmission speeds, from Fast Ethernet at 100 Mbps to Gigabit Ethernet and beyond, are identical. What changes is the operating context and what the network must guarantee.
Standard Ethernet assumes a climate-controlled room, stable AC power, and traffic that can tolerate delay. Industrial Ethernet assumes none of that. It adds hardened hardware, predictable latency for time-critical applications, fast recovery when a link fails, and support for the industrial protocols used in automation and utility control. A dropped email is an inconvenience. A dropped trip signal in a substation is a safety event.
Industrial Switch vs. Regular Switch: Key Differences
The advantages of industrial Ethernet switches over regular office Ethernet switches show up in five places: temperature, physical design, power, electrical immunity, and lifespan.
Wide Operating Temperature Range
Commercial switches are typically rated for roughly 0 to 40°C. Industrial Ethernet switches offer a wide operating temperature range, commonly -40 to +75°C, and some Comnet substation-rated models extend to +85°C. Wide operating temperatures matter anywhere equipment sits in an unconditioned roadside cabinet or outdoor substation yard. Most hardened Ethernet switches are also fanless, removing the moving part that fails first in dust and heat.
Enclosure and DIN Rail Mounting
Office Ethernet switches ship in plastic or thin sheet metal housings. Industrial Ethernet switches use ruggedized metal enclosures, typically rated IP30 to IP67, that resist dust, moisture, shock, and vibration. DIN rail mounting is the norm: switches clip onto a standard 35 mm DIN rail inside a control cabinet or traffic controller. DIN rail mounting saves space, speeds field installation, and keeps compact designs serviceable in crowded cabinets.
Power Supply Design
Regular Ethernet switches run from a single AC adapter. Industrial Ethernet switches usually accept DC power across a wide voltage range, with dual inputs for a redundant power supply. If one source fails, the switch keeps running on the other, to support continuous operation without a truck roll. A redundant power supply is one of the simplest ways to improve network reliability.
Electromagnetic Interference and Electrical Isolation
Motors, drives, and switchgear generate electromagnetic interference that disrupts data transmission on unprotected network hardware. Industrial Ethernet switches are tested for high EMI immunity, surge withstand, and electrostatic discharge resistance. Where copper is exposed to ground potential rise or lightning, fiber optic cables carry data with full electrical isolation between buildings or between a substation yard and its control house.
Service Life and MTBF
Industrial switches use components rated for continuous duty, which yields a higher Mean Time Between Failures (MTBF) than office hardware. The result is higher reliability, a longer service life and fewer maintenance visits, which matters at unmanned sites hours from the nearest technician.
What Is the Purpose of an Industrial Switch?
The purpose of an industrial switch is to keep data moving between field equipment and the systems that monitor and control it, regardless of conditions.
Network Redundancy for High Availability
An industrial network is often built as a ring so a single cable cut does not isolate a device. Redundancy protocols such as RSTP and MSTP, along with faster proprietary ring technologies, detect a broken link and reroute network traffic, often in under hundreds of milliseconds. Comnet's C-Ring technology recovers in under 10 ms across rings of up to 250 switches, to support high availability in mission-critical environments like substations and transit corridors.
Power over Ethernet for Field Devices
Power over Ethernet (PoE) delivers power and data transmission over a single cable, eliminating separate power runs to each device. That reduces installation time and simplifies cable management. PoE switches can power IP cameras, sensors, wireless access points, and badge readers. With IEEE 802.3bt, Power over Ethernet reaches 90W per port, enough for PTZ cameras with heaters and other high-draw equipment.
Security and Traffic Control
Switches at the network edge also form a security boundary. Managed Ethernet switches offer comprehensive security functions, including SNMPv3, HTTPS, SSH, IEEE 802.1X port authentication, and the ability to disable unused ports. VLAN segmentation separates control traffic from video and corporate traffic, limiting how far an intrusion or broadcast storm can spread across network segments.
Managed and Unmanaged Switches in Industrial Networks
Industrial Ethernet hardware comes as managed and unmanaged switches, and the right switch depends on how much visibility the application needs. Many sites use both: managed switches at the core, unmanaged switches at simple edge points.
Managed Switches
Managed switches let engineers configure and monitor every port. Features include VLANs, QoS traffic prioritization, bandwidth management, IGMP snooping to contain multicast video, port mirroring for troubleshooting, and SNMP-based remote monitoring. Managed switches also support the redundancy protocols and diagnostic tools that keep critical environments online, making them the default for any utility, transportation, or government network.
Read more about smart switches vs managed switches.
Unmanaged Switches
Unmanaged switches are plug and play: no configuration, no login, no ongoing administration. They are suitable for small, fixed-topology segments, such as adding a few plug and play devices to an existing managed network. Hardened unmanaged switches keep the same rugged construction and wide temperature ranges as managed switches. The tradeoff is visibility, since unmanaged switches cannot segment traffic, report network faults, or join a redundant ring. For more, read our guide to smart switches vs. managed switches.
Industry Standards and Certifications
Certifications separate industrial Ethernet switches from office hardware in a metal box. One of the main advantages of certified hardware is that it has already been tested against the conditions it will face.
IEC 61850-3 defines environmental and EMC requirements for communication equipment in substations and power automation. IEEE 1613 sets comparable requirements for utility network devices and is a common specification for critical infrastructure projects. EN50155 covers equipment on rail vehicles, including severe shock and vibration, and NEMA TS-1/TS-2 applies to traffic signal control equipment.
Comnet ranks among the top BABA certified ethernet switches.
Where Industrial Ethernet Switches Are Used
Industrial Ethernet switches are suitable for industrial or outdoor applications wherever downtime carries a safety, financial, or regulatory cost:
- Power utilities: substation automation, SCADA, protective relaying, and perimeter security at critical infrastructures such as generation sites
- Transportation: traffic signal cabinets, roadside cameras, message signs, and rail signaling (see our ITS industrial Ethernet switch buyer's guide)
- Industrial automation: machine controllers, sensors, and robotics in industrial environments with heavy electrical noise
- Physical security: cameras and access control across campuses, airports, hospitals, and government sites
How to Choose the Right Industrial Ethernet Switch
Choosing the right industrial Ethernet switch starts with the environment, then the network design:
- Temperature range: confirm wide operating temperatures cover the worst case inside the enclosure. Extreme temperatures in a sun-loaded cabinet run well above ambient.
- Certifications: match IEC 61850-3, IEEE 1613, EN50155, or NEMA TS-2 to the application.
- Management level: managed switches for segmentation, monitoring, and redundancy; unmanaged switches for simple edge links.
- Ports and transmission speeds: Fast Ethernet is often suitable for sensors and controllers, while video needs Gigabit Ethernet or 10G uplinks. SFP modules support fiber connectivity for long runs without replacing the switch.
- PoE budget: total the draw of every powered device and leave headroom.
- Power inputs: specify dual DC inputs for redundant power and a voltage range that matches site power.
- Supply chain: for federal, utility, and defense-adjacent projects, confirm TAA and NDAA compliance.
Comnet Industrial Ethernet Switches
Comnet switches are designed for reliable operation in mission-critical environments where replacing hardware is slow and expensive. Comnet specialists offer expert support for network upgrades and new builds, and the hardened lineup is engineered specifically for industrial environments.
Substation-Rated Switches
The RLGE3FE7MS4, a managed Layer 2 Gigabit Ethernet switch, is fully compliant with IEC 61850-3, IEEE 1613 Class 2, EN50155, and NEMA TS-1/TS-2. It adds support for IGMP snooping, IEEE 802.1Q VLANs, HTTPS and SSH, C-Ring redundancy, and SFP modules for fiber runs up to 120 km.
Hardened Managed PoE Switches
For surveillance and access control, the CNX16F4T12MPB is a DIN rail Layer 2+ switch with four 90W 802.3bt ports, eight 30W 802.3at ports, a 360W Power over Ethernet budget, and four 10G SFP+ ports. For aggregation, the CNGE24MS2 pairs 8 SFP ports and 16 Gigabit combo ports with C-Ring, ComRing, and MSTP/RSTP/STP support, plus comprehensive security functions like device binding and DoS/DDoS protection.
Compact Edge Switches
The compact CNGE2FE4SMS self-managed switch pairs four 10/100 copper ports with two Gigabit SFP slots for easy installation at small edge segments. Comnet DIN rail power supplies and SFP modules complete the cabinet, so switching, fiber connectivity, and power come from one NDAA-compliant source of network infrastructure.
If your next project puts network infrastructure in a substation, roadside cabinet, or factory floor, contact Comnet and our engineers will help you specify the switch that keeps it running.
Building a Network That Holds Up
Switches are among the smallest line items in an industrial network budget and among the most consequential. Office-grade switches save money until the first heat wave, surge, or cable cut takes a camera ring offline. Industrial Ethernet switches earn their place by staying online: rated for the temperatures inside the cabinet, certified for the site, fed from redundant inputs, and managed closely enough to segment and monitor data. Match those four requirements to the application, and the network stops being the weak point.
If your next project puts network infrastructure in a substation, roadside cabinet, or factory floor, contact Comnet and our specialists will help you specify the switch that keeps it running.
