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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 The governing standard is UL 1585, soon to be superseded by UL 5085 which has been harmonized with CSA to address minor differences between US and Canadian requirements.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.

First, there is the issue of installed cost and total cost of ownership. If the transformer relies on a fuse for power limitation and protection, there is the additional cost of this protection and the potential service cost of replacing this protection.

Second, there is an important safety issue. If the fuse is field replaceable, an end user may bypass the protection or use a larger fuse thereby defeating its purpose and possibly creating a safety hazard.

Third, there is the issue that often a larger transformer must be used than would otherwise be necessary. The reason for this is that when using a transformer that is not “inherently limited” the transformer must be selected to accommodate the peak current draw to prevent opening the fuse. This often represents overkill as the typical loads for a Class 2 transformer are intermittent and often have high initial current draw followed by much lower steady state draw. Using an “inherently limited” transformer allows the transformer to be sized for the average rather than peak load.

This remarkable transformer is suitable for any application requiring a 100 VA Inherently Limited Class 2 transformer. Typical applications would include appliances, medical applications , vending machines, control panels, HVAC and refrigeration. The potential applications are virtually unlimited and we have the ONLY 100VA Class 2 Transformer.

Foster Transformer Company's Survivor Transformer has been chosen as the "product of the week" in the July 19 Edition of Air Conditioning Heating Refrigeration News.

The Survivor Class 2 transformer with short circuit and overload protection is capable of withstanding a direct short circuit in excess of 15 days, says the company. According to the manufacturer, the transformers are classified as inherently limited, which eliminates the need for external protection or problematic internal fusing. Also, it extends the range of Class 2 transformers, allowing them to be used in intermittent-duty applications that would cause the fuses or circuit breakers used by other manufacturers to open, claims the company. Models are available from 40 to 100 VA, with either a 60 Hz rating or a 50/60 Hz rating. Primary input voltages include 115 V, 115/120 V, 200/300 V, and 460 V, with 24 V output.

The Survivor™ line of transformers proven so Unique it was awarded US patent #4951168!

March 15, 2004:

Foster Transformer Company Announced The Successful Opening Of A New Manufacturing Plant In China Without Closing US Facilities.

Herman A. Harrison, President announced today from Foster Transformer Company Corporate Headquarters in Cincinnati, Ohio that they have shipped over one-half million parts from their newest manufacturing plant in China with virtually no production delays or rejects. Mr. Harrison believes the addition of the China Plant was accomplished so smoothly by taking the time and patience to do it right the first time and by keeping US plants in operation. Foster completed the successful transition of their longer running transformers, power supplies and solenoids into the new China facility without compromising their level of commitment to manufacturing quality parts in the US.

In keeping with Foster's philosophy, since their founding in 1937, of keeping American workers working. Foster opened this facility in China without significantly cutting the workforce in existing plants in Seymour, Indiana or Cincinnati, Ohio. Maintaining the 3 facilities has allowed Foster the cost cutting option of building longer running, lighter weight parts in China and the flexibility to fill emergency orders and smaller custom orders from stateside facilities. Unlike competitors who closed US plants when relocating off-shore, by maintaining a consistent presence in the US, events such as the Longshoreman's strike would not affect Foster's ability to service customers needs. Since all three plants are completely agency certified any plant could manufacture any product at any given time.

Foster continues to maintain their Corporate Offices, Engineering and Design teams in the Cincinnati, Ohio facility affording them easy access to their customers as well as Certifying agencies, UL, CUL & TUV. This in turn allows them the ability to react quickly to solve design/manufacturing emergencies.

** Download Press Release March 15 pdf