Dear Colleagues, Sorry to once again bring up the issue on surge suppressors. I have received some very good information so far, but I still do not have a practical solution.
I have a high powered power supply that fails the IEC1000-4-5 test during the 2kV line to earth test. An MOV from line to ground allows this supply to pass. I am told by most sources that "Surge Suppressing" devices from line to ground is not allowed. PERIOD! BUT now, I have received information from TUV that says, "If a Varistor transient suppressor is separately approved according to Publications IEC 1051-1 and IEC 1051-2, it can be accepted without a protective device". I'm not familiar with these standards. Does anyone make such a device? Will such a device protect my product from a 2kV line to earth surge? TUV goes on to say; "If a Varistor transient suppressor is NOT separately approved, a protective device against the short-circuit is require." In this case, I understand that a Gas-Tube spark gap AND a fuse in series with the varistor are necessary. Summary Questions: 1. So can a surge suppressor approved to IEC-1051 REALLY be used in products for Europe? 2. Can this part truly be used alone, without the protection devices? 3. What companies make such a device? 4. Will such a device suppress the 2kV surge generated during the IEC1000-4-5 test? 5. If I go the second route, what requirements must the spark gap and fuse meet? Does someone make a part that incorporates these devices in one part? 6. Are there other (and maybe better) ways to solve my compliance problem? Thank you, Brian Kunde Group Leader Compliance Testing Center LECO Corporation 3000 Lakeview Ave. St. Joseph, MI 49085 (616) 982-5423 phone (616) 982-8964 fax [email protected] --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], or [email protected] (the list administrators).
