Resonance CountermeasuresSURGE ABSORBERS
In case surge absorber located between power line to ground; point A in figure, reacts against the surge, residual voltage is transmitted to the latter part of the circuit. Some part of the circuit is destroyed because of amplified residual voltage by LC resonance of a noise filter and/or a coil. Potential equalization before and behind the common mode coil by a surge absorber; GDT2, is recommended as a measure.
Carrying out potential equalization between the terminals of a common mode coil and the both ends of a coil with a surge absorber (GDT2, GDT3) is recommended.
Recommended parts
| AC Withstand Voltage Test | GDT1 | MOV | GDT2 , GDT3 | |
|---|---|---|---|---|
| ～AC125V | Test is not required | DE37-401W | 220V～270V (φ10mm) |
CSA70-301L CSA70-401L DE37-301L DE37-401W DE37-501M DSS-301L DSS-401M |
| AC1,000V AC1,200V |
CDA70-272M FA55-272 |
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| ～AC250V | Test is not required | DE37-501M | 470V～680V (φ10mm) |
|
| AC1,500V | CDA70-302M FA55-302 |
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| AC1,800V | CDA70-362M FA55-362 |
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| AC2,000V | FA55-402 |