The latest news from the Unipart Rail Group of Companies

Isolating Surge Protection Unit (ISPU)

Isolating Surge Protection Unit (ISPU)

The introduction of new Rolling Stock driven by AC Traction Motors, has resulted in Electro Magnetic Capability (EMC) issues with conventional signalling in the United Kingdom. This can delay the testing and launch of these new trains on key inter-city routes. 

Park Signalling Ltd have developed a solution to minimise the effects of this and other electrical surges, on Solid State Interlocking (SSI) signalling systems.

The Isolating Surge Protection Unit (ISPU-E) for SSI Data Links is an improved surge protection unit that incorporates a transformer to greatly enhance immunity to common mode surges and voltages, protecting the Data Link Modules (DLM) from displaying faults or even failing.

Park Signalling’s ISPU is the only ISPU device with Network Rail approval (PADS no. 086/047164).

The ISPU-E SP01 module is designed to meet the requirements of BS EN 50125-3:2003 for equipment housed in a cubicle, (Altitude A1, Temperature Range T1). 

All electrical connections are made via the 11 pin (B11A) plug base, in accordance with GS/ES 1937.


Download the Product Flyer

Contact the Park Signalling team for further information and support: E-


Adding Value through Reduced Risk, Increased Safety and Product Innovation   

About this author
Nicola Holt

Infrastructure Marketing Manager

I have been a part of the Unipart Rail marketing team for over 15 years in the role as Marketing Manager. I focus mostly on supporting the Signalling side of the business with Unipart Dorman, in the UK and North America and also our more recent acquisition - Park Signalling. The Unipart Dorman Traffic sector is also a key area in which I support in addition to the Unipart Rail Manufacturing business.


Leave a Comment

Name (required):

Email (Will not be published) (required):

Your thoughts: (Characters remaining: ) )

SPAM Protection: Sum of 18 + 15 ?

Read the Ts & Cs? Tick to confirm you agree to abide by our house rules

Enter text shown in this image into the box below.

Search Our Blogs

Recent Tweets

Commenting Guidelines
By commenting on this blog you agree to abide by our Terms and Conditions. Although we will do our utmost to avoid it, we reserve the right to edit, move or delete any comments which do not follow the guidelines provided