Bypass Switches

20A to 160A either two pole or four pole switches

Harland Simon design a standard range of wall or panel mounted external Manual Maintenance UPS Bypass Switches (MMBS).


  • The MMBS are available as rotary switches or static type
  • Ratings for rotary type bypass switches are available – 20A to 160A either two pole or four pole switches. The static version is currently available at either 10A or 16A single phase only
  • The MMBS escutcheon reads Normal / Test / Bypass as standard, other escutcheon plates are available
  • All enclosures are of sheet steel design
  • All switches are key lockable or pad lockable in all 3 positions
  • The MMBS enclosures are provided with full connection instructions for easy electrical installation.
  • Alternative combination and designs are available
  • Alternative distribution enclosures are also available which can provide the UPS installation with optional power distribution outlets and typically house local incoming isolators, MMBS, and customer specified MCB’s
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Three Phase 32A - 400A EMBS

Three Phase 32A – 400A EMBS

32A to 400A External Wall Mount Bypass Switch

Three Phase Input – Three Phase Output. 32A to 400A External Wall Mount UPS Bypass Switch.

Other options available upon request

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