20 A Circuit Breaker 101

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Part	Manufacturer	Circuit Protection Type	Mounting Feature	Rated AC Voltage	Rated DC Voltage	Rated Current	Terminal Shape	Minimum Operating Temperature	Rated Breaking Capacity	Manufacturer Series	Trip Time/Delay	Additional Features	Actuator Type	Packing Method	Body Length/Diameter	Body Width	Environmental Characteristics	Dimensions	Circuit Function	Body Height	Reference Standard	No. of Poles	Maximum Operating Temperature	Blow Characteristic
CA1-B2-12-620-321-C	Carling Technologies	Magnetic Circuit Breaker	Panel Mount	480 V	150 V	20 A	Stud	-40 °C (-40 °F)	10 kA				Handle		1.85 in (47 mm)	0.75 in (19.05 mm)			Series Trip	2.5 in (63.5 mm)	UL	1	85 °C (185 °F)
CA1-B2-12-620-321-MJ	Carling Technologies	Magnetic Circuit Breaker	Panel Mount		80 V	20 A	Stud	-40 °C (-40 °F)	10 kA				Handle		2.5 in (63.5 mm)	0.755 in (19.18 mm)	Corrosion/Moisture Resistant		Series Trip	1.85 in (47 mm)	CSA; TUV; UL	1	85 °C (185 °F)
IEG1-1-52-20.0-01-V	Sensata Technologies	Magnetic Circuit Breaker	Panel Mount		80 V	20 A	Quick Connect	-40 °C (-40 °F)	7.5 kA				Toggle		2 in (50.8 mm)	0.75 in (19.05 mm)	Corrosion/Moisture Resistant		Trip Free	1.687 in (42.85 mm)	CCC; VDE	1	85 °C (185 °F)
IEG1-1-72-20.0-91-V	Sensata Technologies	Magnetic Circuit Breaker	Panel Mount	240 V	80 V	20 A	Quick Connect	-40 °C (-40 °F)	2 kA				Toggle		2 in (50.8 mm)	0.75 in (19.05 mm)	Corrosion/Moisture Resistant		Trip Free	1.687 in (42.85 mm)	CCC; VDE	1	85 °C (185 °F)
W69-X2Q12-20	TE Connectivity	Magnetic Circuit Breaker	Panel Mount	277 V		20 A	Quick Connect	-40 °C (-40 °F)	5 kA		2.2 s		Toggle		2.25 in (57.15 mm)	2 in (50.8 mm)	Fungus Resistant; Moisture Resistant	2.25 x 2 x 1.64 in (57.15 x 50.8 x 41.66 mm)	Series Trip	1.64 in (41.66 mm)	CSA; UL	3	85 °C (185 °F)	Standard
W69-X2Q1220	TE Connectivity	Magnetic Circuit Breaker	Panel Mount	277 V		20 A	Quick Connect				2.2 s		Toggle						Series Trip			3
2-5700-IG1-P10-DD-20A	E-t-a Elektrotechnische Apparate	Thermal Circuit Breaker	Panel Mount	250 V	50 V	20 A	Quick Connect	-20 °C (-4 °F)	2 kA			Rated breaking capacity at 50 VDC: 2500 A	Push To Reset		1.142 in (29 mm)	0.571 in (14.5 mm)	Corrosion/Moisture Resistant; IP00; IP40		Trip Free	1.831 in (46.5 mm)	CQC; CSA; UL; VDE	1	60 °C (140 °F)
3CU20R	Altech	Thermal Magnetic Circuit Breaker	DIN Rail Mount	480 V		20 A	Snap On	-20 °C (-4 °F)	5 kA				Toggle Handle	Bulk	3.366 in (85.5 mm)	2.067 in (52.5 mm)	IP20		Trip	2.362 in (60 mm)	CE, CUL, UL	3	60 °C (140 °F)
3RV2021-4BA15	Siemens	Thermal Magnetic Circuit Breaker	DIN Rail Mount	690 V		20 A	Snap On	-20 °C (-4 °F)	2 kA			Interrupting current max at 450 VDC: 10000 A	Handle		3.819 in (97 mm)	1.772 in (45 mm)	IP20	3.819 x 1.772 x 3.815 in (97 x 45 x 96.9 mm)	Trip	3.815 in (96.9 mm)	ATEX; CCC; CE; CSA; EAC; IECEX; KC; UL; VDE	3	60 °C (140 °F)	Instantaneous
4411.0010	Schurter Ag	Thermal Circuit Breaker	Panel Mount	277 V	28 V	20 A	Quick Connect	-5 °C (23 °F)	1 kA				Reset Type	Bulk	1.22 in (31 mm)	0.453 in (11.5 mm)	IP40		Trip Free	1.772 in (45 mm)	CCC; CSA; GB; IEC; UL; VDE	1	60 °C (140 °F)
483-G411-K1M1-A1S0ZN--20A	E-t-a Elektrotechnische Apparate	Thermal Circuit Breaker	Panel Mount	115 V	28 V	20 A	Screw	-55 °C (-67 °F)	2.5 kA			Rated breaking capacity at 28 VDC: 6000 A	Push-Pull		0.768 in (19.5 mm)	0.559 in (14.2 mm)	IP40; IP00		Tease-Free And Trip-Free	1.22 in (31 mm)		1	125 °C (257 °F)
5SJ4320-7HG41	Siemens	Thermal Circuit Breaker	DIN Rail Mount	400 V	125 V	20 A	Screw And Snap On		14 kA				Handle		3.543 in (90 mm)	2.126 in (54 mm)	IP20; IP40	3.543 x 2.126 x 2.992 in (90 x 54 x 76 mm)	Trip	2.992 in (76 mm)		3
AA1-B0-21-620-1B1-C	Carling Technologies	Magnetic Circuit Breaker	Panel Mount	277 V		20 A	Quick Connect	-40 °C (-40 °F)	5 kA			Standards: MIL-PRF-55629, MIL-STD-202	Handle		2 in (50.8 mm)	0.755 in (19.18 mm)	Corrosion/Moisture Resistant		Series Trip	1.64 in (41.66 mm)	CSA; UL	1	85 °C (185 °F)
AA1-B0-21-620-1D2-C	Carling Technologies	Magnetic Circuit Breaker	Panel Mount	277 V		20 A	Quick Connect	-40 °C (-40 °F)	5 kA			Standards: MIL-PRF-55629, MIL-STD-202	Handle		2 in (50.8 mm)	0.755 in (19.18 mm)	Corrosion/Moisture Resistant		Series Trip	1.64 in (41.66 mm)	CSA; UL	1	85 °C (185 °F)
AF2-B0-14-620-413-D	Carling Technologies	Magnetic Circuit Breaker	Panel Mount		80 V	20 A	Screw	-40 °C (-40 °F)	3 kA			Standards: MIL-PRF-55629, MIL-STD-202	Rocker		2.156 in (54.76 mm)	1.515 in (38.48 mm)	Corrosion/Moisture Resistant		Series Trip	1.64 in (41.66 mm)	CSA; UL; VDE	2	85 °C (185 °F)
CX2-B0-14-620-22A-15G	Carling Technologies	Magnetic Circuit Breaker	Panel Mount		410 V	20 A	Screw	-40 °C (-40 °F)	10 kA				Handle		3.672 in (93.26 mm)	1.515 in (38.48 mm)	Corrosion/Moisture Resistant		Series Trip	2.264 in (57.51 mm)	UL	2	85 °C (185 °F)
FAZ-C20/3	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	480 V		20 A	Snap On	-40 °C (-40 °F)	15 kA				Toggle		3.15 in (80 mm)	2.091 in (53.1 mm)				2.362 in (60 mm)	CCC; CSA; UL; VDE	3	75 °C (167 °F)	Short
FAZ-D20/3-NA	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	480 V	60 V	20 A	Snap On	-25 °C (-13 °F)	15 kA				Manual On/Off		4.134 in (105 mm)	2.091 in (53.1 mm)	IP20; IP40		Trip	2.972 in (75.5 mm)	CSA; EN; IEC; UL	3	75 °C (167 °F)
MS2-M-24-620-2-1CA-A-0CA	Carling Technologies	Magnetic Circuit Breaker	Panel Mount	240 V		20 A	Screw	-40 °C (-40 °F)	2 kA				Sealed Toggle		1.375 in (34.93 mm)	1.3 in (33.02 mm)	Moisture Resistant; IP68;		Series Trip	2.158 in (54.81 mm)		2	85 °C (185 °F)
MS26574-20	Eaton Corporation	Thermal Circuit Breaker	Panel Mount-Threaded	120 V	28 V	20 A	Screw		500 A			Standard: MIL-C-5809, rated breaking capacity at 28 VDC: 2000 A			0.78 in (19.81 mm)	0.593 in (15.06 mm)		0.78 x 0.593 x 1.251 in (19.81 x 15.06 x 31.78 mm)		1.251 in (31.78 mm)	MS	1
NC1V-1111-20AA	Idec	Magnetic Circuit Breaker	DIN Rail And Panel Mount	250 V	65 V	20 A	Snap On	-10 °C (14 °F)	2.5 kA				Toggle		3.102 in (78.8 mm)	0.689 in (17.5 mm)			Manual On/Off	2.598 in (66 mm)	CCC; CE; CSA; PSE; TUV; UL	1	60 °C (140 °F)
NC1V-1111F-20AA	Idec	Magnetic Circuit Breaker	DIN Rail Mount	250 V	65 V	20 A	Snap On	-10 °C (14 °F)	2.5 kA				Toggle		2.811 in (71.4 mm)	0.689 in (17.5 mm)	IP20		Series Trip	2.598 in (66 mm)	CCC; CE; CSA; PSE; TUV; UL	1	60 °C (140 °F)
S201U-K20	Abb	Thermal Circuit Breaker	DIN Rail Mount	230 V		20 A	Snap On	-25 °C (-13 °F)	10 kA				Manual On/Off		2.795 in (71 mm)	0.689 in (17.5 mm)	IP20	2.795 x 0.689 x 3.622 in (71 x 17.5 x 92 mm)		3.622 in (92 mm)	CCC; CSA; IEC; UL; VDE	1	55 °C (131 °F)
5SY4120-7	Siemens	Thermal Circuit Breaker	DIN Rail Mount	400 V		20 A	Snap On	-25 °C (-13 °F)	5 kA						3.535 in (89.8 mm)	0.693 in (17.6 mm)	IP20; Sealed	3.535 x 0.693 x 3.008 in (89.8 x 17.6 x 76.4 mm)	Trip	3.008 in (76.4 mm)	CCC; CE; IMQ; RCM; UL; VDE	1	55 °C (131 °F)
AA1-B0-24-620-5D1-C	Carling Technologies	Magnetic Circuit Breaker	Panel Mount	277 V		20 A	Screw	-40 °C (-40 °F)	5 kA			Standards: MIL-PRF-55629, MIL-STD-202	Handle		2 in (50.8 mm)	0.755 in (19.18 mm)	Corrosion/Moisture Resistant		Series Trip	1.64 in (41.66 mm)	CSA; UL	1	85 °C (185 °F)
AA1-B0-34-620-5D1-C	Carling Technologies	Magnetic Circuit Breaker	Panel Mount	277 V	80 V	20 A	Screw	-40 °C (-40 °F)	5 kA			Standards: MIL-PRF-55629, MIL-STD-202	Handle		2 in (50.8 mm)	0.755 in (19.18 mm)	Corrosion/Moisture Resistant		Series Trip	1.64 in (41.66 mm)	CSA; UL	1	85 °C (185 °F)
LELH11-1-62-20.0-91-V	Sensata Technologies	Magnetic Circuit Breaker	Panel Mount	240 V		20 A	Screw		5 kA				Toggle Handle		2.49 in (63.24 mm)	1.515 in (38.48 mm)	Corrosion/Moisture Resistant		Trip Free	1.859 in (47.22 mm)	CCC; VDE	2
MS26574-20A	Eaton Corporation	Thermal Circuit Breaker	Panel Mount-Threaded	120 V	28 V	20 A	Screw		500 A			Standard: MIL-C-5809, rated breaking capacity at 28 VDC: 2000 A			0.78 in (19.81 mm)	0.593 in (15.06 mm)		0.78 x 0.593 x 1.251 in (19.81 x 15.06 x 31.78 mm)		1.251 in (31.78 mm)	MS	1
NRBM3100-20AAA	Idec	Magnetic Circuit Breaker	Panel Mount	250 V		20 A	Stud	-40 °C (-40 °F)	1 kA				Lever		2.48 in (63 mm)	2.256 in (57.3 mm)			Series Trip	1.87 in (47.5 mm)	CCC; CE; CUL; PSE; UL; VDE	3	85 °C (185 °F)
CMB-203-27J8N-B-A/20	Carling Technologies	Thermal Circuit Breaker	Panel Mount	250 V	32 V	20 A	Quick Connect	-10 °C (14 °F)	1 kA			Rated breaking capacity at 32 VDC: 2500 A	Push To Reset		1.154 in (29.3 mm)	0.551 in (14 mm)			Manual On/Off	1.78 in (45.2 mm)		1	60 °C (140 °F)
24452	Schneider Electric Sa	Thermal Magnetic Circuit Breaker	DIN Rail Mount	440 V	125 V	20 A	Snap On	-30 °C (-22 °F)	5 kA				Toggle	Bulk	3.189 in (81 mm)	1.417 in (36 mm)	IP20; IP40		Trip	2.874 in (73 mm)	CCC; CSA; IEC; UL	2	70 °C (158 °F)
FAZ-C20/1-NA-SP	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	277 V		20 A	Snap On		10 kA				Toggle						Manual On/Off			1
FAZ-D20/2-NA	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	277 V		20 A	Snap On		10 kA				Toggle						Manual On/Off			2
BAB2020	Eaton Corporation	Thermal Magnetic Circuit Breaker	Panel Mount	240 V		20 A	Screw		10 kA				Toggle Handle	Bulk					Trip		CSA; UL	2
FAZ-C20/2-NA	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	277 V		20 A	Snap On		10 kA				Toggle						Manual On/Off			2
FAZ-C20/3-NA	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	277 V	60 V	20 A	Snap On	-25 °C (-13 °F)	14 kA				Toggle Handle		4.134 in (105 mm)	2.091 in (53.1 mm)	IP20; IP40		Trip Free	1.772 in (45 mm)	CE; CSA; EN; IEC; UL	3	75 °C (167 °F)
FAZ-D20/2	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	480 V	96 V	20 A	Snap On	-40 °C (-40 °F)	5 kA				Toggle		3.15 in (80 mm)	1.394 in (35.4 mm)	IP20		Trip Free	2.362 in (60 mm)	CSA; UL	2	167 °C (332.6 °F)
KD1-20	Eaton Corporation	Magnetic Circuit Breaker	Panel Mount			20 A	Quick Connect						Push Button		0.63 in (16 mm)				Trip	1.409 in (35.8 mm)	CSA, UL
QC1020	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	120 V		20 A	Snap On		10 kA				Toggle						Trip		CSA; UL	1	40 °C (104 °F)
121B20-B2PKA	Eaton Corporation	Thermal Circuit Breaker	Panel Mount		12 V	20 A	Stud	-23 °C (-9.4 °F)					Automatic Reset		1.272 in (32.3 mm)	0.831 in (21.1 mm)	Water Resistant			0.618 in (15.7 mm)	SAE	1	65 °C (149 °F)
19220-02M	Eaton Corporation	Thermal Circuit Breaker	Panel Mount		14 V	20 A	Tab/Blade	-40 °C (-40 °F)	300 A				Push To Reset		1.15 in (29.21 mm)	0.36 in (9.14 mm)			Manual Reset/Off	0.92 in (23.37 mm)	SAE	1	85 °C (185 °F)
25120-B-2	Eaton Corporation	Thermal Circuit Breaker	Panel Mount		32 V	20 A	Stud	-40 °C (-40 °F)	2.5 kA				Push Button		2.194 in (55.73 mm)	1.457 in (37 mm)	Fluid Resistant, IP66		Manual On/Off	0.728 in (18.5 mm)	UL	2	85 °C (185 °F)
278874	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	480 V		20 A	Screw And Snap On	-40 °C (-40 °F)	10 kA				Handle	Bulk	3.15 in (80 mm)	2.126 in (54 mm)	IP20		Trip	2.858 in (72.6 mm)	CE; CSA; EN; IEC; UL	3	75 °C (167 °F)
BAB3020H	Eaton Corporation	Thermal Magnetic Circuit Breaker	Panel Mount	240 V		20 A	Screw		10 kA				Toggle Handle	Bulk					Trip		CSA; UL	3
CHF120	Eaton Corporation	Thermal Magnetic Circuit Breaker	Panel Mount	240 V	240 V	20 A			10 kA				Toggle		3 in (76.2 mm)	0.75 in (19.05 mm)			Trip	3 in (76.2 mm)	UL	1
FAZ-B20/2	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	480 V	96 V	20 A	Snap On	-40 °C (-40 °F)	15 kA				Toggle		3.15 in (80 mm)	1.394 in (35.4 mm)	IP20		Manual On/Off	2.362 in (60 mm)	CCC; CE; CSA; IEC; UL; VDE	2	75 °C (167 °F)	Short
FAZ-B20/2-NA	Eaton Corporation	Thermal Magnetic Circuit Breaker	DIN Rail Mount	277 V		20 A	Snap On		10 kA				Toggle						Manual On/Off			2
3TC2-20	Texas Instruments	Thermal Circuit Breaker	Panel Mount	120 V	28 V	20 A	Screw		2 kA	3TC2		Rated breaking capacity at 28 VDC: 6000 A	Push-Pull		1.094 in (27.79 mm)	0.781 in (19.84 mm)	Corrosion Resistant	1.094 x 0.781 x 1.03 in (27.79 x 19.84 x 26.16 mm)		1.03 in (26.16 mm)

Circuit Breaker

A circuit breaker is an automatic electrical switch that is designed to protect an electrical circuit from damage caused by overcurrent or short circuits. Circuit breakers are commonly used in residential, commercial, and industrial electrical systems, and they are an important safety device that helps prevent electrical fires, equipment damage, and personal injury.

Circuit breakers work by monitoring the amount of current flowing through an electrical circuit. If the current exceeds a preset level, the circuit breaker will trip, or open the circuit, to prevent damage to the electrical system. When the circuit breaker trips, it interrupts the flow of current, which stops the electrical current from flowing and prevents further damage.

Circuit breakers are available in a variety of types and sizes, and they can be classified based on their voltage rating, current rating, and interrupting capacity. Some common types of circuit breakers include thermal circuit breakers, magnetic circuit breakers, and hybrid circuit breakers.

In addition to protecting electrical systems from overcurrent and short circuits, circuit breakers also help improve the reliability and efficiency of electrical systems. They can also be used to switch electrical circuits on and off, which can be helpful in certain applications.