Fourrmula Limited was formed in 2018 by John Casey, CEng MIMechE. After almost 45 successful years in the MV switchgear industry, 35 of those years conceiving and designing successful products, it became apparent to John that he enjoyed ‘Designing’ switchgear and wanted to continue his career as a Consultant in this area. Based in Cheshire, UK, Fourrmula has allowed John to concentrate on Cost Effective Engineering Design.

  • John has successfully performed cost effective design and industrialisation of market leading switchgear products in major global companies
  • Conceived and presented four novel concept ideas to promote one company as innovators in the UK. Two of these novel ideas are now successfully in production.
  • Designed Four successful market leading Ring Main Units (RMU) at three different companies……hence………..Fourrmula


Sharing knowledge and experience to assist companies with design and cost reduction.

Designing an advanced Non-SF6 RMU to add to the existing ‘four’ SF6 RMU designs. (Ringmaster 2, Guardian, VRN2A, VRN6A).

Enjoying being part of a successful design and product introduction team with the aim of introducing a world beating, novel, environmentally friendly, cost effective and future proof RMU product and range.


Innovating Efficient Ethical