Circuit Breakers – Mouser United Kingdom

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3120-N Next-Generation Circuit Breaker/Switch

E-T-A Circuit Breakers 3120-N Next-Generation Circuit Breaker/Switch combination unites overcurrent protection and the function of an ON/OFF switch within a single component. The trip element is a thermal bimetal. 3120-N Next-Generation Circuit Breaker/Switch, which replaces the 3120-F series, is ideally suited for overload protection of motors, pumps, transformers, and cables. After tripping, the device can reliably, easily, and quickly be reset. The positively trip-free mechanism ensures reliable circuit disconnection even with the actuator blocked.

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Part #

Circuit Breakers The 3120-N thermal circuit breaker/switch combination unites overcurrent protection and the function of an ON/OFF switch within a single component. The trip element is a thermal bimetal. Type 3120-N is ideally suited for overload prot

3120-N321-P7T1-W01D-2.5A
E-T-A
1: £28.86
9Expected 07/04/2026

Mfr. Part No.
3120-N321-P7T1-W01D-2.5A

Mouser Part No
457-321P7T1W01D2.5A

E-T-A

Learn More

Datasheet

9Expected 07/04/2026

£28.86

£25.03

£23.70

£22.13

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

2.5 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Non-Illuminated

3120-N321-P7T1-W02F-2A
E-T-A
1: £33.40
10Expected 27/02/2026

Mfr. Part No.
3120-N321-P7T1-W02F-2A

Mouser Part No
457-321P7T1W02F2A

E-T-A

Learn More

Datasheet

10Expected 27/02/2026

£33.40

£25.03

£23.70

£22.13

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

2 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Non-Illuminated

Circuit Breakers The 3120-N...4 IP65 rated thermal circuit breaker/switch combination unites overcurrent protection and the function of an ON/OFF switch within a single component. The trip element is a thermal bimetal. Type 3120-N...4 is ideally suite

3120-N324-P7T1-W19FG4-1A
E-T-A
1: £41.64
9Expected 31/03/2026

Mfr. Part No.
3120-N324-P7T1-W19FG4-1A

Mouser Part No
457-324P7T1W19FG41A

E-T-A

Learn More

Datasheet

9Expected 31/03/2026

£41.64

£36.35

£28.59

£27.52

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

1 A

230 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N521-P7T1-W19DG3-10A
E-T-A
1: £38.29
10Expected 21/04/2026

Mfr. Part No.
3120-N521-P7T1-W19DG3-10A

Mouser Part No
457-521P7T1W19DG310

E-T-A

Learn More

Datasheet

10Expected 21/04/2026

£38.29

£31.77

£27.24

£25.66

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

10 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N523-P7T1-W19DG3-10A
E-T-A
1: £38.29
9Expected 10/04/2026

Mfr. Part No.
3120-N523-P7T1-W19DG3-10A

Mouser Part No
457-523P7T1W19DG310A

E-T-A

Datasheet

9Expected 10/04/2026

£38.29

£31.77

£26.33

£24.05

£20.28

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

10 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N321-P7T1-W19DG4-10A
E-T-A
1: £34.89
40Expected 07/04/2026

Mfr. Part No.
3120-N321-P7T1-W19DG4-10A

Mouser Part No
457-N321P7T1W19DG410

E-T-A

Learn More

Datasheet

40Expected 07/04/2026

£34.89

£31.49

£27.47

£24.20

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

10 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N321-P7T1-W19DG4-15A
E-T-A
1: £29.54
10Expected 17/03/2026

Mfr. Part No.
3120-N321-P7T1-W19DG4-15A

Mouser Part No
457-N321P7T1W19DG415

E-T-A

Learn More

Datasheet

10Expected 17/03/2026

£29.54

£25.92

£21.08

£20.28

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

15 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N324-P7T1-W19FG4-X3120-S01BM-2.5A
E-T-A
1: £67.63
13Expected 17/04/2026

Mfr. Part No.
3120-N324-P7T1-W19FG4-X3120-S01BM-2.5A

Mouser Part No
457-FG4X3120S01BM2.5

E-T-A

Learn More

Datasheet

13Expected 17/04/2026

£67.63

£57.69

£50.87

£43.96

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

2.5 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

Circuit Breakers Min Ord Qty 10. The 3120-N thermal circuit breaker/switch combination unites overcurrent protection and the function of an ON/OFF switch within a single component. The trip element is a thermal bimetal. Type 3120-N is ideally suited for overload prot

3120-N303-N7Q1-W01K-16A
E-T-A
1: £24.33
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N303-N7Q1-W01K-16A

Mouser Part No
457-0N303N7Q1W01K16A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£24.33

£20.19

£16.53

£14.57

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N311-P7T1-W01H-0.5A
E-T-A
1: £28.45
Non-Stocked Lead-Time 9 Weeks

Mfr. Part No.
3120-N311-P7T1-W01H-0.5A

Mouser Part No
457-0N311P7T1W01H0.5

E-T-A

Learn More

Datasheet

Non-Stocked Lead-Time 9 Weeks

£28.45

£23.61

£19.46

£17.16

£14.42

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

500 mA

240 VAC

50 VDC

1 Pole

Rocker

- 30 C

+ 60 C

Non-Illuminated

3120-N311-P7T1-W01K-12A
E-T-A
1: £23.09
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N311-P7T1-W01K-12A

Mouser Part No
457-0N311P7T1W01K12A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£23.09

£19.16

£15.69

£13.84

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N311-P7T1-W02F-2.5A
E-T-A
1: £28.91
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N311-P7T1-W02F-2.5A

Mouser Part No
457-0N311P7T1W02F25A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£28.91

£26.64

£22.65

£21.91

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

2.5 A

240 VAC

50 VDC

1 Pole

Rocker

- 30 C

+ 60 C

Non-Illuminated

3120-N311-P7T1-W04K-18A
E-T-A
1: £23.09
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N311-P7T1-W04K-18A

Mouser Part No
457-0N311P7T1W04K18A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£23.09

£19.16

£15.69

£13.84

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N311-P7T1-W14DR3-3A
E-T-A
1: £28.22
Non-Stocked Lead-Time 9 Weeks

Mfr. Part No.
3120-N311-P7T1-W14DR3-3A

Mouser Part No
457-0N311P7T1W14DR33

E-T-A

Learn More

Datasheet

Non-Stocked Lead-Time 9 Weeks

£28.22

£23.41

£19.29

£17.02

£14.31

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

3 A

115 VAC

50 VDC

1 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N311-P7T1-W14DR3-5A
E-T-A
1: £28.22
Non-Stocked Lead-Time 9 Weeks

Mfr. Part No.
3120-N311-P7T1-W14DR3-5A

Mouser Part No
457-0N311P7T1W14DR35

E-T-A

Learn More

Datasheet

Non-Stocked Lead-Time 9 Weeks

£28.22

£23.41

£19.29

£17.02

£14.31

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

5 A

115 VAC

50 VDC

1 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N31F-P7T1-SGRD-10A
E-T-A
1: £24.72
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N31F-P7T1-SGRD-10A

Mouser Part No
457-0N31FP7T1SGRD10A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£24.72

£20.52

£16.90

£14.91

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N31F-P7T1-SGRD-15A
E-T-A
1: £24.72
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N31F-P7T1-SGRD-15A

Mouser Part No
457-0N31FP7T1SGRD15A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£24.72

£20.52

£17.51

£16.14

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N31F-P7T1-SGRD-20A
E-T-A
1: £24.72
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N31F-P7T1-SGRD-20A

Mouser Part No
457-0N31FP7T1SGRD20A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£24.72

£20.52

£16.90

£14.91

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N323-P7T1-W02L-15A
E-T-A
1: £25.23
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N323-P7T1-W02L-15A

Mouser Part No
457-0N323P7T1W02L15A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£25.23

£23.26

£19.76

£19.02

£16.65

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

15 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Non-Illuminated

3120-N35F-H7T1-SGRD-16A
E-T-A
1: £29.65
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
3120-N35F-H7T1-SGRD-16A

Mouser Part No
457-0N35FH7T1SGRD16A

E-T-A

Datasheet

Non-Stocked Lead-Time 10 Weeks

£29.65

£26.42

£19.44

£17.76

£15.54

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

Circuit Breakers Min Ord Qty 10. The 3120-N...4 IP65 rated thermal circuit breaker/switch combination unites overcurrent protection and the function of an ON/OFF switch within a single component. The trip element is a thermal bimetal. Type 3120-N...4 is ideally suite

3120-N514-P7T1-W01D-10A
E-T-A
1: £27.07
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N514-P7T1-W01D-10A

Mouser Part No
457-0N514P7T1W01D10A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£27.07

£22.45

£18.51

£16.33

£13.72

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N521-P7T1-W01L-16A
E-T-A
1: £28.87
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N521-P7T1-W01L-16A

Mouser Part No
457-0N521P7T1W01L16A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£28.87

£25.04

£23.70

£22.13

View

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N521-P7T1-W02D-16A
E-T-A
1: £28.87
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N521-P7T1-W02D-16A

Mouser Part No
457-0N521P7T1W02D16A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£28.87

£25.82

£21.95

£20.60

£17.48

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

Rocker

3120-N521-P7T1-W15DY3-2A
E-T-A
1: £54.35
Non-Stocked Lead-Time 9 Weeks

Mfr. Part No.
3120-N521-P7T1-W15DY3-2A

Mouser Part No
457-0N521P7T1W15DY32

E-T-A

Learn More

Datasheet

Non-Stocked Lead-Time 9 Weeks

£54.35

£46.36

£42.39

£37.75

£34.06

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

2 A

115 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N521-P7T1-W16D-3.5A
E-T-A
1: £25.91
Non-Stocked Lead-Time 9 Weeks
New At Mouser

Mfr. Part No.
3120-N521-P7T1-W16D-3.5A

Mouser Part No
457-0N521P7T1W16D35A

New At Mouser

E-T-A

Datasheet

Non-Stocked Lead-Time 9 Weeks

£25.91

£25.22

£21.42

£20.66

£20.28

Min.: 1
Mult.: 1

3120-N

Thermal Circuit Breaker

Overcurrent Protection

3.5 A

240 VAC

50 VDC

2 Pole

Rocker

- 30 C

+ 60 C

Illuminated

3120-N Next-Generation Circuit Breaker/Switch

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100 mA
200 mA
300 mA
500 mA
600 mA
700 mA
800 mA
1 A
1.2 A
1.5 A
1.8 A
2 A
2.5 A
3 A
3.5 A
4 A
4.5 A
5 A
6 A
7 A