One Surge on an Unprotected Control Panel Can Halt Your Entire Production Line
A transient on the AC power feed destroys the PLC. A surge on the RS485 cable burns out the communication board from the data side — bypassing power protection entirely. TrilPeak's IEC 61643-11 certified DIN-rail SPDs protect both pathways simultaneously, keeping your control panels running through storms and grid events.
3 Industrial Automation Surge Protection Failures That Stop Production
Most industrial control panel failures after a surge event are preventable. These are the scenarios panel builders and plant engineers encounter — and what causes them.
The PLC Is Destroyed. The Line Stops.
A lightning-induced transient on the incoming AC supply destroys the PLC and motor control center simultaneously. Hardware replacement costs thousands. But the unplanned production stoppage — affecting every downstream process — costs far more and takes days to restore. A single Type 2 SPD on the panel incoming feed prevents this entirely.
Power Is Protected. The PLC Burns Out Anyway.
The panel has AC surge protection installed. After a storm, the PLC communication board fails. The surge entered through the RS485 cable from a remote field sensor — bypassing the power SPD completely. This is the most common and most overlooked failure mode in industrial automation. Both AC and signal lines must be protected.
Panel Fails Factory Acceptance Test.
A completed control panel is rejected at FAT because the SPDs specified are not IEC 61643-11 certified or the documentation is incomplete. The panel builder carries the cost of rectification and project delays. Using IEC 61643-11 compliant SPDs from the start prevents this entirely.
What Industrial Automation Surge Protection Does Your Application Need?
Protection requirements vary by panel complexity and site exposure. Use the guide below to identify which layers apply to your installation.
Single PLC or MCC — Indoor Low-Risk Site
Remote Field Devices — Long Cable Runs
Factory Roof, Exposed Processing Plant
Industrial Automation Surge Protection — 4 Entry Points Covered
Surges reach the PLC through four separate paths. Each needs its own protection — covering one while leaving others open still results in a failure.
Why Panel Builders Choose TrilPeak for Industrial Automation Surge Protection
IEC 61643-11 Documentation — Passes FAT First Time
All TrilPeak industrial AC SPDs are tested and documented to IEC 61643-11. Full documentation ships with every order — ready for factory acceptance test submittals without additional paperwork.
AC Power and RS485 Signal — One Supplier
We manufacture both high-capacity AC SPDs and RS485/RS232 signal line protectors. Complete industrial automation surge protection from one factory, one purchase order, one document set.
Standard 35mm DIN-Rail. Pluggable Module.
Every SPD mounts on standard 35mm DIN rail with a pluggable cartridge — hot-swap replacement without disconnecting the panel or stopping the production line.
In-House MOV Manufacturing
We manufacture our own Metal Oxide Varistor chips — direct control over clamping voltage and thermal performance for consistent quality across every production batch and OEM run.
Industrial Automation Surge Protection — FAQ
Why must RS485 signal lines be protected separately from the AC power feed?
Surges induced on long field device cables enter the PLC directly through the RS485 communication port — bypassing AC surge protection entirely. If only the AC supply is protected, the PLC is still vulnerable to destruction via its data ports. Both pathways require dedicated industrial automation surge protection. For IEC 61643-11 standard details refer to the IEC official standards body.
Do TrilPeak SPDs fit standard DIN-rail control panels?
Yes. All TrilPeak industrial AC and signal SPDs are designed for standard 35mm DIN-rail mounting with pluggable modules — seamless integration for panel builders and OEM manufacturers. No special enclosure or custom wiring required.
Are your SPDs suitable for export-bound panels and international EPC projects?
Yes. TrilPeak SPDs comply with IEC 61643-11, making them fully compliant for panels destined for European and international markets. Full documentation is included for project submittals and factory acceptance tests.
Can I get samples for panel integration testing?
Yes. Samples are available at standard product price. Lead time for stock items is typically 5–10 days. Contact us with your voltage rating and DIN-rail configuration and we will confirm availability within 24 hours.
What voltages do your industrial SPDs cover?
We manufacture a comprehensive range covering standard 120V, 230V and 400V AC power feeds, as well as low-voltage 12V and 24V DC control lines and RS485 communication circuits. Contact us with your specific requirements for a direct product recommendation.
Protect Your Control Panels
Tell us your panel type and application — our engineers will confirm the right industrial automation surge protection specification within 24 hours.