#121B20-B2M Line Protective Switch | Circuit Breakers

121B20-B2M

Circuit Breaker

NSN 5925-01-600-7960

DEMIL
Shelf Life
UOM
NIIN
Demil:
NO
Shelf Life:
UOM:
NIIN:
016007960

Product Technical Spec.

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
Item Name:
Line Protective Switch
Cage Code:
1JY78

Cross Referenced Parts

Part Number
Cage
RNCC
RNVC
RNAAC
Status
MSDS
SADC
Part Number:
CB-20A
Cage Code:
Z08X2
RNCC:
5
RNVC:
2
RNAAC:
ZA
Status:
A
MSDS:
SADC:
Part Number:
121B20-B2M
Cage Code:
11873
RNCC:
5
RNVC:
9
RNAAC:
9Z
Status:
A
MSDS:
SADC:

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Catalog Drilldown
--- Electrical And Electronic Equipment Components
------ Circuit Breakers
--------- Circuit Breakers
------------ P/N 121B20-B2M

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Last Updated: 08/11/2025