Model: K173A50

Circuit Breaker

Properties:

Body Style
Multipole-single actuator type
Body Length
4.125 inches
Body Width
3.344 inches
Body Height
3.375 inches
Case Material
Plastic
Center To Center Distance Between Terminals Parallel To Length
2.625 inches
Center To Center Distance Between Terminals Parallel To Width
1.125 inches
Distance Between Centerlines Of Mounting Facilities Parallel To Body Length
0.500 inches
Distance Between Centerlines Of Mounting Facilities Parallel To Body Width
2.937 inches
Boss Height
0.125 inches
Pole Quantity
3
Mounting Facility Type And Quantity
2 threaded stud
Thready Qty Per Inch (tpi)
24
Maximum Continuous Load Current Rating Per Pole
50.0 amperes ac all locations and 50.0 amperes dc all locations
Operating Voltage Type And Rating Per Pole In Volts
125.0 ac all locations and 125.0 dc all locations
Maximum Interrupting Capacity Current Type And Rating Per Pole In Amps
5000.0 ac all locations and 5000.0 dc all locations
Circuit Protection Type
Overcurrent all locations
Trip Release Method
Thermal-magnetic all locations
Trip Release Characteristic
Instantaneous all locations and time delay all locations
Ultimate Trip Rating Of Continuous Current Rating Per Pole In Percent
138.0 all locations
Ultimate Trip Time Per Pole In Seconds
3600.000 all locations
Reset Method
Manual
Main Contact Tripping Mechanism Type
Trip free
Manual Actuator Type And Quantity
1 toggle
Actuator Function
Trip-reset
Actuator Position Designation
At pole two
External Actuator Linkage Arrangement
One, two, and three linked
Thread Size
0.216 inches
Trip Delay Time In Seconds Per Rated Continuous Current
10.000 at 125 pct all locations and 100.000 at 125 pct all locations
Inclosure Protection Type For Which Designed
Shockproof and vibrationproof
Trip Release Ambient Tempurature Rating
50.0 degrees celsius all locations
Frequency In Hertz
60.0 all locations
Test Data Document
81349-mil-c-17588 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).
Thread Series Designator
Unc
Terminal Type And Quantity
6 quick disconnect, male
NSN
5925-00-620-3974
Part Number
K173A50
Description
Circuit Breaker
CAGE
03497

A device with means other than fuses for automatically opening the circuit in which it is installed when the current varies from the predetermined value for which the device is set. May include provisions for manual operation. At least one set of contacts must be in series with the actuating element(s). A combination of semiconductor and passive devices may be used in lieu of contacts. For automatically operated items in which the actuating (tripping) element and contacts are not in series, see relay (as modified). For items which are operated both manually and automatically but the actuating elements and contact are not in series, see relay-switch. Excludes circuit breaker box and magneto "breaker" assemblies. See also switch (as modified); and controller.

Part K173A50 NSN 5925-00-620-3974

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
00136
FIIG:
A030A0
Concept No.:
App. Key:
A
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:
A
ESD:
ESD:
MMAC:
CRITL:
X

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: 8536200040
  • SITC: 77252
  • End Use: Electric apparatus
  • NAICS: 335313
  • USDA: 1

Freight Class: Automatic circuit breakers, for a voltage not exceeding 1,000 v, nesoi

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