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Magnetically Latched DC Contactors PC60, MB60 and
SW60
PC60-M, MB60-M and SW60-M
The contactors can be supplied with magnetic latching - one short
pulse to close the main contacts - one short pulse to reopen them again.
The result is a bi-stable device, the coil of which consumes no
power except during the closing and opening strokes, and because there is
in effect no heating of the coil, the contactors can be engineered in the
first place with more powerful coils and springs than with conventional
contactors.
Contact Ratings and all external dimensions are
identical to those of the equivalent types which have conventionally
energised coils. Similarly all the additional features which are available
with the other PC60 and SW60 types can be found with magnetically latched
versions, e.g. auxiliary contacts, magnetic blowouts for main contacts,
protected, etc.
For more details of the operation of
the "M" versions, please see the Albright publication:
"Power Consumption Reduction for Albright
Contactors"
Please Note.
Very Important:
Magnetically latched contactors do not fail safe. If
there is a power failure, or if the supply to the contactor coil is
broken, the contactor contacts will not open or close, i.e. the contactor
will not change state.
These devices should not therefore be used in
applications where the failure of contacts to open or close could cause
result in a hazardous situation for persons or equipment. |
