Although state of the art for their time, the Health and Safety Executive has
become increasingly concerned by the continued use of Direct Manually Operated Switchgear
(DMOS) such as Oil Circuit Breaker equipment. Recognising that this was potentially a very
serious problem affecting a wide cross section of end users, Ellison developed a neat,
cost effective replacement solution, allowing fully tested, modern equipment to be
substituted for the older system.
What were the potential problems with
Oil Circuit Breaker equipment?
Operation - The speed of operation is determined by the operator. Closing
the system too slowly can inhibit the fault making capability of the circuit breaker, with
potentially catastrophic results.
Switchgear - Most 'OCB' equipment was installed over 20 years ago. Often,
electrical systems have been upgraded with little or no concern for the fault capability
of the switchgear, leaving a system which could not cope with a major short circuit.
Maintenance - Components become worn, oil in the breaker can thicken with
Knowledge - exists in the operation of this equipment, particularly in the
case of companies who have down-sized their electrical maintenance resource.
The Ellison solution
involves replacement of the oil gear, with fully tested Circuit
Breaker or Fuse Switch replacement units. These have been specifically
designed to facilitate replacement.
information pack is available - detailing the reasons for concern and
the possible solutions to companies considering replacement.
on the 'Request Information' link and
select Oil Circuit Breaker Replacement Pack from the drop down list
on the request form.