Although this product range is now obsolete from full manufacture, we pride ourselves on having the ability to provide a full spares, service & repair service for all Hawker Siddeley Switchgear heritage products.




We can offer a range of spares for the MM74 to meet your requirements, including:

  • Protection Relays
  • Main Contacts
  • Shunt Trip Coils
  • Closing Coils
  • Catch Boxes
  • Various Springs

Tools Available

Tools Include:

  • Steering Dolly
  • Isolating Handle
  • Closing Handle

All enquiries should be forwarded to the Spares Department at or click here to request a quote.

Alternatively click on “Key Contacts” and speak to one of our experienced sales team



get in touch

Contact HSS

+44 (0)1495 223001

+44 (0)1495 223001

+ 61 7 3888 2333

what we've done

case studies

ENWL Case study Wilmslow retrofit ENWL approved

SSEN - Horizon Framework