AFA and AFAX Conveyor Belt Alignment Switch
Cooper Crouse-Hinds
Application:
AFA, AFAX conveyor belt alignment switches
are used:
as emergency or normal ‘‘STOP’’ switch for
conveyor belts whenever they become
misaligned or run off their tracks due to
excessive speed, uneven load, leveling,
breakage and/or other problems.
in steel mills, mining and ore and coal
handling operations, automotive and other
assembly lines, warehouses, loading docks,
grain loading and handling facilities, and
various other bulk handling operations.
in the control circuit of magnetic motor
starters to shut down motor-driven conveyors
in case of abnormal belt misalignment or
run-off.
AFA series
complies with requirements for
use in Class II areas having combustible
dusts that may or may not be electrically
conductive.
AFA series
are also gasketed for use in
hosedown areas even when combustible
dusts are present.
AFAX series
complies with requirements for
use in NEC Class I areas which are
hazardous due to the presence of flammable
vapors or gases.
AFAX series also complies
with NEC requirements for use in Class II
hazardous areas, or for use in NEC
hazardous areas classified simultaneously as
Class I and Class II.
Features:
Furnished with precision switches that
provide normally open and normally closed
contacts (switches have a snap action
mechanism).
Housing consists of a center section which
can be mounted either vertically or
horizontally, and a switch housing with an
attached switch operating arm.
Enclosure has three 1 conduit hubs. Cast
mounting lugs on 11⁄2 center permit
attachment to the web of a standard 3 angle
iron.
Operating arm has 31⁄2 long stainless steel
protective roller. Approximately 3⁄4 lateral
movement of operating arm actuates switch.
Spring loaded operating arm will
automatically return switch to normal position
when belt interference is removed.
A severe conveyor belt run-off can rotate
the operating arm counter-clockwise up to
85 degrees without damage to the switch
mechanism.
Installation of AFA or AFAX unit on either
side of a conveyor belt allows approximately
or a predetermined allowable belt
misalignment before switch is actuated. A
typical installation would include a pair of
AFA or AFAX units at each end of the
conveyor belt where belt returns.
Options:
Finish: Corro-free TM epoxy powder coat –
add suffix S752 to the standard catalog
number for coating outside only.
Electrical Rating:
Control circuit switches – 15 AMP, 600 VAC
max.
Certifications and
Compliances:
AFA SERIES
NEC/CEC: Class II, Division 1, Groups
E,F,G, Class II, Division 2,
Groups F,G
Class III
NEMA: 3, 4, 9EFG
IP66
UL Standard: 698
CSA C22.2 No. 25
AFAX SERIES
NEC: Class I, Division 1 & 2, Groups C,D
Class II, Division 1, Groups E,F,G
Class II, Division 2, Groups F,G
Class III
NEMA: 3, 7CD, 9EFG
IP65
UL Standard: 698
Typical AFA Switch Application
Horizontal mounting
Contact
Arrangement Diagram Cat. #
2 normally
open
2 normally
closed
AFA20
AFAX20
Standard Materials:
Enclosure – Feraloy® iron alloy
Bearing and operating arm – stainless steel
with plastic end caps
Standard Finishes:
Feraloy – electrogalvanized and aluminum
acrylic paint
Stainless steel – natural
Cooper Crouse-Hinds MARKASINA A?T ?R?N GRUPLARI
