Component Descriptions
April 2020 2-14 06-237619-001
Figure 2-17. Pressure Operated Switch, Hazloc
2-4.7 Pressure Operated Trip
The pressure operated trip, Part No. 81-874290-000 (Figure 2-18), is connected to the
distribution piping and utilizes agent pressure for actuation. The agent pressure displaces a
spring-loaded piston to disengage a holding ring from the stem connected to the piston.
Figure 2-18. Pressure Operated Trip
U
L
3 POLE
SINGLE
THROW
TOGGLE
SWITCH
SET POSITION
GAS
INLET
PRESSURE
OPERATED
EXPLOSION
PROOF
SWITCH
3 POLE
4-3/8 in.
(111 mm)
(6) COVER
SCREWS
30 AMP 250 VAC
20 AMP 600 VAC
2 HP 110-600 V
3 PHASE AC
KIDDE-FENWAL INC.
400 MAIN STREET
ASHLAND, MA 01721
UNION CONNECTION
(2) 13/32 in. MOUNTING HOLES
LISTED 472M
SIGNAL SWITCH
FOR USE IN
HAZARDOUS
LOCATIONS
CLASS I, GROUP D
CAUTION: TO PREVENT
IGNITION OF HAZARDOUS
ATMOSPHERES, DISCONNECT
THE DEVICE FROM THE
SUPPLY CIRCUIT BEFORE
OPENING, KEEP ASSEMBLY
TIGHTLY CLOSED WHEN
IN OPERATION
TO RESET PUSH
STEM TO SET
POSITION
OPERATING HEAD
PRESSURE INLET - 1/2 in. NPT FEMALE
CLUTCH
9 in.
(229 mm )
STEM IN OPERATED POSITION
STEM IN SET POSITION -
PULL UP ON STEM TO
MANUALLY OPERATE SWITCH
1 in. NPT FEMALE BOTH ENDS
FOR ELECTRIC CONNECTION.
SWITCH SUPPLIED WITH
(2) 1 in. NPT PIPE PLUGS
6-5/16 in.
(160 mm)
3-1/2 in.
(89 mm)
4-3/16 in.
(106 mm)
EXPLOSION PROOF
MACHINED JOINT.
DO NOT USE GASKET
OR MAR SURFACES.
BODY
2-1/2 in.
(64 mm)
BRACKET WITH
3/8 in. (10 mm) DIA.
MOUNTING HOLE
GUARD
STEM
RING
PISTON
SPRING
1-3/8 in. (35 mm) HEX
1/2 in. NPT FEMALE
PRESSURE INLET
1-5/8 in.
(41 mm)
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