Model: 121B20-B2M

Circuit Breaker

Properties:

Body Style
Single pole type
Overall Width
0.790 inches
Body Length
1.240 inches
Body Width
0.790 inches
Body Height
0.640 inches
Case Material
Metal
Center To Center Distance Between Terminals Parallel To Length
0.690 inches
Unthreaded Mounting Hole Diameter
0.196 inches
Distance Between Centerlines Of Mounting Facilities Parallel To Body Length
1.560 inches
Boss Height
0.560 inches
Mounting Surface To Terminal End Distance
1.250 inches
Pole Quantity
1
Mounting Facility Type And Quantity
2 unthreaded hole
Thready Qty Per Inch (tpi)
32
Maximum Continuous Load Current Rating Per Pole
20.0 amperes dc all locations
Operating Voltage Type And Rating Per Pole In Volts
14.0 dc all locations and 28.0 dc all locations
Maximum Interrupting Capacity Current Type And Rating Per Pole In Amps
1.5 dc all locations
Circuit Protection Type
Overcurrent all locations
Trip Release Method
Thermal all locations
Trip Release Characteristic
Time delay all locations
Reset Method
Automatic
Internal Trip Release Configuration
Series trip all locations
Thread Size
0.190 inches
Trip Release Duty Cycle
Continuous all locations
Trip Release Ambient Tempurature Rating
-40.0 degrees fahrenheit all locations and 185.0 degrees fahrenheit all locations
Part Name Assigned By Controlling Agency
Series 12x shortstop circuit breaker, 20amp dc
Thread Series Designator
Unf
NSN
5925-01-600-7960
Part Number
121B20-B2M
Description
Circuit Breaker
CAGE
1JY78

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 121B20-B2M NSN 5925-01-600-7960

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:
A
ESD:
A
MMAC:
CRITL:
X

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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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