Surge Voltage Protection Test
Surge Voltage Protection Test as per IEC 61000-4-11
Lightning isn't the only thing that disturbs power lines. Normal grid operation causes its own share of dips, short interruptions, and sudden swings — and low-voltage AC equipment has to handle all of it without missing a beat.
IEC 61000-4-11 covers exactly this. It's aimed at how electrical and electronic equipment respond to voltage dips, brief interruptions, and variations on a standard AC power input — the everyday disturbances, not the dramatic lightning-strike kind.
Testing works by applying these disturbances directly to the power input at different severity levels, then watching how the device reacts. Does it keep running? Reset briefly? Shut down completely? Each response gets compared against the standard's acceptance criteria.
This matters most in places where grid supply isn't rock-solid — industrial zones, defence installations, regions with older infrastructure. Equipment that fails during routine grid noise creates safety risk and downtime that's entirely preventable with the right upfront testing.
The process at Aldo Compliance
Calibrated Equipment
Simulating disturbances using calibrated equipment matched to IEC 61000-4-11 parameters
Dip Depths and Durations
Testing multiple dip depths and durations to map out full immunity performance, not just one point
Response Logging
Logging every response with precise timing, so nothing gets missed
Immunity Report
Compiling results into a report showing exactly which immunity class the equipment achieves
Frequently Asked Questions
How is this different from the over/under voltage test?
Both sit under IEC 61000-4-11 and check related immunity — the emphasis just shifts depending on the application.
Which industries ask for this most often?
Defence, telecom, industrial automation, lighting, electronic products, battery OEM and power equipment manufacturers are the regulars here.