Model: 644A-3

Pressure Switch

Properties:

Overall Length
3.900 inches
Body Length
3.500 inches
Overall Diameter
1.870 inches
Unthreaded Mounting Hole Diameter
0.210 inches
Pressure Switch Type
Absolute
Mounting Facility Circle Radius
1.500 inches
Mounting Method
Unthreaded hole
Contact Action Stimulus
Increase
Mounting Facility Pattern
Three position circular
Nonpile-up Contact Arrangement
1 pole, double throw, one position momentary
Terminal Type
Threaded stud
Contact Load Current Rating
5.0 amperes resistive load single voltage
Contact Adjustability
Deactuation point not adjustable and actuation point not adjustable
Contact Stimulus Rating
11.20 actuation point pounds per square inch absolute and 0.67 deactuation point pounds per square inch absolute
Contact Voltage Rating In Volts
28.0 dc at altitude single voltage
Media For Which Designed
Gas, liquefied
Style Designator
Cylindrical
NSN
5930-00-076-0111
Part Number
644A-3
Description
Switch,pressure
CAGE
09049

A switch which is actuated by changes in pressure of any gas or liquid or by changes in a vacuum acting upon its sensing element. Excludes baroswitch; switch, pressure-thermostatic; and switch, sensitive.

Part 644A-3 NSN 5930-00-076-0111

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
00206
FIIG:
A048B0
Concept No.:
1
App. Key:
D
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
P
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
061300
UFC:
34410
LTL:
77.5
LCL:
--
WCC:
658
TCC:
Z
SHC:
9
ACC:
Instruments/Radio

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Schedule B and Export
  • Schedule B: 8536509065
  • SITC: 77255
  • End Use: Electric apparatus
  • NAICS: 335931
  • USDA: 1

Freight Class: Switches, for a voltage not exceeding 1000 volts, nesoi

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