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Foster Transformer Company has received UL approval on the Worlds First and only, 100 Va Inherently Limited Class 2 Transformer. This remarkable transformer is a part of Foster’s Patented Survivor™ line of transformers. The first transformer in this 100VA offering is a custom design. However, we expect to add several standard voltages including a center tapped version in the next few weeks. Look for the Data Sheet to add to your catalog shortly.
Prior to our Survivor™ series, “inherently limited” Class 2 transformers were limited to smaller sizes and were generally sacrificed if a short was applied. Our Survivor™ series now extends to 100VA which is the maximum allowable under the code and is self protected toeliminate failures resulting from overloading the transformer.
Class 2 transformers are defined in the National Electric Code for use in “power limited circuits”. The governing standard is UL 1585, soon to be superseded by UL 5085 which has been harmonized with CSA to address minor differences between US and Canadian requirements. Class 2 transformers are commonly used as the interface between humans and machines as their output is considered to not represent a shock hazard. If the output power of the transformer is limited “inherently” the transformer may be used without additional fusing. If the transformer is not "inherently” limited it means that in order to limit the output power levels a separate fuse must be used.
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