Parr Instrument 4857 User Manual
Page 8
4857 Reactor Controllers
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4857 Process Controller Front Panel
S
WITCHES AND
I
NDICATORS
4857 Switches and Indicators
The Main Switch is a manual, two-position,
illuminated switch which will cut off power to the
controller. The light indicates power the power is
on. Take care to position the controller such that
the main power switch may be accessed easily
when the controller needs to be disconnected.
P
ROTECTIVE
F
USES
4857 Fuses
Two instrument fuses are mounted on the
back panel. These are Fast-acting, 250VAC, 3.0
amp fuses, intended to protect the internal
circuitry of the controller.