Currently these are still manufactured to the BR 865 Specification which details transformers to BR924A and fuses to BS714 for the inrush current test.  
 
However, since the start of the 21st century the industry has utilised smaller, faster acting fuses and these require a transformer with a much lower inrush current.
This requirement is even more critical for T/Js with a high duty cycle, such as those supplying the AWS electro-magnets and this has led to the introduction of our Low Inrush & Ultra Low inrush current (LIC & ULIC) ranges.
 
The following Low Inrush Current transformer rectifiers have now been approved for use by Network Rail and are available exclusively from ourselves:

POWER WATTS	VOLTS D.C.	CURRENT A.D.C.	BR CAT NO	INRUSH CAPABILITY
12	12	1	86/34455	LIC
24	24	1	86/34475	LIC
60	50-60	1	86/34495	ULIC
72	24	3	86/34477	ULIC
180	50-60	3	86/34497	ULIC
330	110	3	86/34518	ULIC
550	110	5	86/34519	ULIC

  

Typically Inrush Current has been reduced by over half from previously available products and in some instances we have achieved much greater improvements. For example, the relevant specification for the 86/34477 allows a maximum Inrush Current of 14 Amps, our ULIC© transformer rectifier has a peak Inrush Current of just 3 Amps whilst the 86/34497 has a peak Inrush Current reduced to just 7 Amps from a maximum allowable of 35 Amps.

We also manufacture many types of T/J’s up to 100A rating including Points Operating and Battery Chargers, further details are available on request.