Specifications

Low Leakage Version
If Low Leakage is required, the MegaPAC Family of Power Supplies has a model variant (must be requested). This
model enables the user to meet various additional specifications. Presently, the PFC MegaPAC, Mini MegaPAC and
Autoranging MegaPAC are available in Low Leakage versions. Other models can be made available. The MegaPAC
Family of Power Supplies consist of:
• PFC MegaPAC
• PFC MegaPAC-High Power
• PFC MegaPAC-EL (Low Noise)
• Mini MegaPAC
• Autoranging MegaPAC
• 4kW MegaPAC
• 4kW MegaPAC-EL (Low Noise)
The advantage of the Low Leakage MegaPAC power supply is in multiple power supply systems that have one AC
input. This option will lower the input leakage current for these products to 100μA or less. An additional external
EMI filter is typically required.
How Low Leakage is obtained
Low Leakage for the MegaPAC Family of power supplies is obtained with the removal of the "Y" capacitors from
within the EMI filter of the MegaPAC as well as the "Y" capacitors on the input of the ConverterPACs*. This reduces
the leakage current from the AC input to AC ground (chassis) to below 100μA (leakage value may differ with use of
Maxi modules.. Consult Factory for more information.) At the same time, since the "Y" capacitors are a vital com-
ponent of the EMI filter, without them, the EMI will go up. When this happens, the unit will no longer meet
Westcor’s published specifications for conducted EMI. In order to reduce the EMI to within an acceptable limit, an
additional external EMI filter is required. All safety agency certifications for the MegaPAC Power Supplies remain
intact**. Contact Applications Engineering for more information.
* Westcor currently has the following ConverterPACs (See ConverterPAC information sheet and/or Design Guide for more infor-
mation):
VI-200/VI-J00 Maxi/Mini/Micro
ModuPAC (M) FinPAC (PZ)
JuniorPAC (J) UniPAC (XU)
DualPAC (D) QPAC (XQ)
RamPAC (R) FinQPAC (PZL)
BatPAC (B)
QPAC (L)
DualQPAC (LD)
Junior QPAC (LJ)
** Please note that the MegaPACs (including Low Leakage versions) are not UL 2601 compliant.
Pg 26 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474 Rev. 4/2010
PFC MegaPAC Design Guide