Sidactor Protection Thyristor Products Page 46 SIDACtor Protection Thyristor Products

SIDACtor Protection Thyristors 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/17 This standard defines test procedures to evaluate equipment EFT resistibility performance. IEC 61000-4-4 Testing and measurement techniques - Electrical fast transient (EFT) Immunity test Table 3.33 Test Levels Table 3.34 Test waveform values Figure 3.9 EFT generator schematic Level Repetition rate kHz Power Ports kV I/O ports kV 1 5 or 100 0.5 0.25 2 1 0.5 3 2 1 4 2 X Special Set voltage V P (open circuit) V P (1 k) V P (50) Repetition rate 250 V 240 V 125 V 5 kHz or 100 kHz 500 V 480 V 250 V 1 kV 950 V 500 V 2 kV 1.9 kV 1 kV 4 kV 3.8 kV 2 kV Burst duration 15 mS 20% at 5 kHz, 0.75 mS 20% at 100 kHz, burst period 300 mS 20%; 5 nS 30% rise time, 50 nS 30% decay to half value time R C (charging resistor) R S (impulse duration shaping resistor) R M (impedance matching) 10 nF 50 coaxial output C HV supply Table 3.35 Guidelines for test level selection Level Environment Description 1 Well- protected Shielded power cables, suppression of all EFT in power supply & control circuits, proper separation of application from other environments 2 Adequately- protected Physical separation of unshielded power cables, partial suppression of EFT in power supply & control circuits 3 Industrial Poor separation between power supply, control, signal & communication cables, no suppression of EFT in power supply & control circuits 4 Severe industrial No separation between power supply, control, signal & communication cables, no suppression of EFT in power supply & control circuits 5 Special Special situation that remain to be analyzed Regulatory Requirements (continued)

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