Send enquiry to Rittal’s Ri4Power Press Stoppers
Rittal’s Ri4Power Press Stoppers
There are few things in our industry to compete
with the destructive force of an arcing fault in
the main or distribution busbars.
Under IEC/TR 61641, all electrical assemblies
must be able to withstand a short circuit current.
Press stoppers are considered essential to
comply with the standard as part of the design
criteria for enclosures.
Rittal’s pressure stoppers provide all the necessary
safeguards for Ri4Power enclosures, protecting
people and equipment from the potentially violent
consequences of this event.
When an arc between phases occurs not only is a huge
amount of energy released but the spark created by the
ignition can reach temperatures of more than
10,000 degrees Celsius.
This heats and expands the air within an enclosure
creating a rise in pressure which can exceed the
enclosure’s design parameters, leading to catastrophic
failure.
Not surprisingly, this destructive force, allied with the
sudden, explosive release of hot gases and particles
into the surrounding atmosphere can have serious
consequences for the operating personnel working on
or standing close to the assembly line.
Furthermore, there are likely to be substantial equipment
and production losses with associated lengthy repair
time and costs, adding up to considerable economic
losses.
Internal short circuits which can lead to arcs are typically
the result of hot spots, tracking across insulation material,
animals or vermin entering into the assembly, loose parts
or human errors.
All electrical assemblies under IEC / TR 61641 must be
designed to take all necessary steps to withstand a specified
short circuit current that is liable to result in internal arc fault
conditions.
Pressure stoppers for roof plates provide pressure relief
during arc fault, and a pressure relief function is essential for
compliance with health and safety regulations for arcing
under IEC/TR 61641.
Rittal’s pressure stoppers convert the IP 55 roof plate for
Ri4Power enclosures into a roof plate with pressure relief
function. This modification only takes minutes and can be
retro-fitted on site if necessary. Rittal’s pressure relief stoppers
have been successfully used in low voltage applications
up to 690 v 50 kA.
Further information at www.rittal.co.uk and
www.friedhelm-loh-group.com, or on
twitter @rittal_ltd.
