Low Leakage Power Supplies
Jerome Industries specializes in ultra low leakage power supplies for demanding medical applications. All Jerome switchmode products are designed to be useable in a type B or BF medical application, where the power supply provides the sole isolation barrier. Please note, that in the following table where the power supply leakage current is referred to as "Output", the 60601-1 document refers to this as "Patient" .
Design Category |
Generalized Description |
60601-1 Compliance Limits: |
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Normal Condition |
Single Fault Condition |
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ALPHA |
This category represents the minimum requirement for medical safety certification of a power adapter. Only the earth leakage current is taken into account during the design of the power supply. By disregarding other possible useage scenario's, a slightly simpler power supply design is realized. All Jerome medical grade adapters exceed this design category, the basic starting level for all Jerome medical products is the Beta category shown below. |
Earth Leakage: 500uA (US/UL Deviation limit is 300uA.) |
Earth Leakage: 1000uA Single fault condition is a open line or neutral connection. |
BETA |
All standard Jerome switchmode power adapters meet this category. The output isolation of the adapter will meet the type B and BF leakage current categories from 60601-1. This leakage current data is available on our web spec pages. Link to standard Jerome Switchmode Products: |
Earth: 500uA (US/UL Deviation limit is 300uA.) Output: 100uA |
Earth: 1000uA Output: 500uA Worst single fault is open earth connection. (US Deviation under UL specs is 300uA.) Type BF also requires less than 5000uA leakage with mains voltage applied directly to output. |
GAMMA |
Switchmode products designed to this category, will meet the type CF output isolation requirements. To meet this category, it is necessary for us to modify the design and construction of the power supply. The WSL part of our product line has been tested and qualified to these ultra low leakge current requirements. Link to type CF Jerome Switchmode Products: |
Earth: 500uA (US/UL Deviation limit is 300uA.) Output: 10uA |
Earth: 1000uA Output: 50uA Worst single fault is open earth connection. Also requires less than 50uA leakage with mains voltage applied directly to output. |
DELTA |
Switchmode products designed to this extra low leakage current category perform extremely well under abnormal situations such as an open ground. The leakage current levels are considerably below CF limits. Designed for applications where earth grounding may possibly be unavailable or intermittant. Link to Delta/Epsilon Jerome Switchmode Products |
Note: Delta leakage levels are much lower than 601 CF leakage levels. | |
Specified Jerome Performance: |
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Normal Condition |
Single Fault Condition |
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| Earth:100uA Output: 3uA |
Earth: 100uA Output: 3uA Open earth, or reversed line and neutral connections. Also will measure less than 30uA leakage with mains voltage applied directly to output. |
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EPSILON |
This category represents the lowest level of leakage current switchmode products which Jerome presently produces. The leakage current levels under normal operation are far below the CF limits. Designed for applications where a reliable earth ground exists in the system deployment environment. Link to Delta/Epsilon Jerome Switchmode Products |
Note: Epsilon leakage levels are much lower than 601 CF leakage levels. | |
Specified Jerome Performance: |
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Normal Condition |
Single Fault Condition |
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| Earth:10uA Output: 0.5uA |
Earth: 100uA Output: 15 uA Open earth, or reversed line and neutral connections. Also will measure less than 50 uA leakage with mains voltage applied directly to output. |
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Ultra low leakage current products which meet the Gamma, Delta or Epsilon level leakage current limits are special order items. Please contact the Jerome sales department at 908-353-5700 with your exact specs in order to determine best product line match with your specific application. Special non-recurring engineering fees will apply for the Gamma, Delta or Epsilon product families. Delta and Epsilon products will generally have a higher prototype fee, and lead time than the Gamma products. The Jerome engineering department may be contacted through the sales department, and can help with technical support. |
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Jerome Industries manufactures external power supplies (also called power adapters) for the international industrial and medical markets. Product offerings include wall plug-in and desktop style power adaptors, medical grade power supplies, battery charger power sources, open frame switchmode power supplies, battery chargers, transformers, linearmode power sources, switchmode power sources, unregulated power supplies, NiCad chargers, NiMH chargers, gel cell chargers, low leakage switching power supplies, military grade power supplies and custom power supplies. Energy Star certified external power supplies now available.
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