Ottermill OMA ACB Retrofit (OTTERFIT) - Before Ottermill OMA ACB Retrofit (OTTERFIT) - After
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Ottermill OMA ACB Retrofit (OTTERFIT)

Ottermill Switchgear Limited were renowned for their high quality engineered Ottermet switchboards and motor control centres. The Ottermill OMA was the ACB installed as a key component within Ottermet switchboards.

The factory located in Ottery St Mary Devon closed in 2004.

Countless Ottermet switchboards remain in service throughout the UK and with regular servicing remain a fully functional element of a sites LV electrical distribution system.
The Ottermill OMA ACB however is the one key element of the Ottermet panel which regularly fails to provide the circuit protection required.

The Ottermill OMA ACB is a mechanical breaker with an oil filled dashpot tripping mechanism, which even with regular maintenance often cannot achieve required disconnection times, in addition many Ottermill OMA ACB`s also contain Asbestos flash guards

No original spares or manufacturers support exists for the Ottermill OMA ACB and replacement of the OMA ACB or even the entire Ottermet panel is the only option to provide reliable circuit protection.

Prior to the design and manufacture of the EDS Otterfit OMA retrofit option, the replacement of an Ottermill OMA ACB required isolation of the power supply to the breaker for a minimum of 12 hours per ACB., replacement of the entire distribution panel could take up to a week.

EDS Otterfit incorporates a Schneider MTZ ACB and is manufactured and assembled in the EDS workshops and delivered to site fully assembled.

Installation of EDS Otterfit can be achieved in around an hour without isolation of the electrical supply to the switchboard.

Case Study:

  • EDS RECENTLY REPLACED 3 Ottermill OMA 12 1250ACB`s in one 4 hour shift at a busy British Regional Airport.
  • The Ottermill OMA ACB`s configured as two mains incomers and a buscoupler supplied a significant part of the passenger terminal.
  • Due to the unique design of the EDS Otterfit OMA Retrofit, the whole operation could be undertaken without disruption to the power supply to the terminal.
  • The buscoupler ACB was changed first and then each of the mains incoming ACB`s were replaced utilising the newly installed EDS Otterfit bus coupler.

Ottermill OMA ACB Retrofit