IEC 61000-4-11 Voltage Dips & Interruptions Immunity Testing
Compatible Electronics is NVLAP-accredited for IEC 61000-4-11 Edition 2 (2004), Edition 3 (2020), KS C 9610-4-11 and AS/NZS 61000.4.11 — voltage dips, short interruptions, and voltage variations immunity testing at three Southern California locations.
NVLAP Lab Code 200527-0
IEC 61000-4-11 Ed. 3 (2020)
IEC 61000-4-11 Ed. 2 (2004)
Lake Forest · Brea · Newbury Park
What is IEC 61000-4-11?
IEC 61000-4-11 defines test methods and procedures for evaluating the immunity of electrical and electronic equipment to voltage dips, short interruptions, and voltage variations on AC power supply inputs. These phenomena occur regularly on public power networks as a result of faults, switching operations, and heavy load changes — and can cause equipment to malfunction, reset, or permanently fail if not properly designed for immunity.
IEC 61000-4-11 immunity testing is required by virtually every product-family and generic immunity standard for equipment connected to AC mains power. It is referenced by EN 61000-6-1 and EN 61000-6-2 generic immunity standards, IEC 60601-1-2 medical device EMC, IEC 61326-1 measurement equipment, EN 55035 multimedia immunity, and EN 50130-4 alarm systems — making it one of the most universally applied EMC tests.
🔎 Performance criteria: IEC 61000-4-11 uses performance criteria A (normal operation during test), B (temporary degradation, self-recoverable), and C (temporary loss of function requiring operator intervention). The applicable criteria depend on the product standard — most require Criterion A or B for dips up to 70% and Criterion C for 100% interruptions. Our EMC Design Consulting team can advise on appropriate criteria for your product and standard.
Voltage Dip & Interruption Test Levels
IEC 61000-4-11 tests are defined by the percentage reduction in supply voltage and the duration of the event. Standard test levels applied under EN 61000-6-1 and EN 61000-6-2 are:
| Test | Voltage Reduction | Duration | Typical Criterion |
|---|
| Voltage Dip | 0% UT (100% dip) | 0.5 cycle | B |
| Voltage Dip | 0% UT (100% dip) | 1 cycle | B / C |
| Voltage Dip | 40% UT (60% dip) | 10 / 25 cycles | C / B |
| Voltage Dip | 70% UT (30% dip) | 25 / 50 cycles | A / B |
| Voltage Interruption | 0% UT (100%) | 250 / 300 cycles | C / B |
