Thermal Magnetic Circuit Breakers

Thermal magnetic circuit breakers are devices that provide protection against overcurrent in circuits. Circuit breakers use an automatically operated electrical switch to disrupt the flow of current when an overload or short circuit is detected. Thermal magnetic circuit breakers do this using an electromagnet and bimetallic strips.

Circuit breakers provide more sophisticated protection against overcurrent than a simple fuse. Fuses simply burn out and have to be replaced, whereas circuit breakers just need to be reset.

How do thermal magnetic circuit breakers work?
In thermal magnetic circuit breakers, there are two ways the flow of current might be detected and disrupted. In the event of a short circuit, the electromagnet rapidly trips the switch. If the overload is smaller, over a longer period of time, the bimetallic strips will instead eventually react to trip the switch.

What are thermal magnetic circuit breakers used for?
Thermal magnetic circuit breakers are most often used in distribution boards. They make up part of the subsidiary circuits in the broader electrical supply system, protecting against overcurrent.

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Description Price Current Rating Number of Poles Range Voltage Rating Width Series Application Break Time Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Mounting Hole Diameter Mounting Hole Length Mounting Hole Size Mounting Hole Width
RS Stock No. 899-4565
Mfr. Part No.3C16UL
BrandAltech
£48.21
Each
Units
16A 3 - 480Y/277V - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-4975
Mfr. Part No.3D30UM
BrandAltech
£33.38
Each
Units
30A 3 - 480Y/277V - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
New
RS Stock No. 216-3247
Mfr. Part No.2800851
£27.42
Each
Units
5A 1 Thermomagnetic Device Circuit Breaker 50V dc 12.3mm CB - - - - - - - -
RS Stock No. 899-1777
Mfr. Part No.2E25UM
BrandAltech
£22.25
Each
Units
25A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, High Efficiency Motors, UL508 Application, Which have Exceedingly High Inrush Current Time Delay 10 kA MCCB - - - -
RS Stock No. 175-0366
Mfr. Part No.REX12-TA1-107-DC24V-4A
BrandETA
£28.93
Each
Units
4A 1 - 24V dc 12.5mm REX12-T - - - - - - - -
RS Stock No. 175-1458
Mfr. Part No.GV4LE07N
£267.00
Each
Units
7A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 201-5738
Mfr. Part No.2800898
£74.99
Each
Units
10A 2 Trabtech 80V dc 24.6mm CB TM2 - - - - - - - -
RS Stock No. 175-1535
Mfr. Part No.GV4PE12N6
£302.00
Each
Units
12.5A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 830-4303
Mfr. Part No.4404.0103
BrandSchurter
£2.84
Each
Units
12A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS Stock No. 175-1487
Mfr. Part No.GV4LE80N6
£269.00
Each
Units
80A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1564
Mfr. Part No.GV4PEM07N
£398.00
Each
Units
7A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 212-2225
Mfr. Part No.3130-F110-P7T1-W19QY7-5A
BrandETA
£21.30
Each
Units
5A 1 - - 18mm 3130 - - - - - - - -
RS Stock No. 899-4616
Mfr. Part No.3C30UL
BrandAltech
£48.21
Each
Units
30A 3 - 480Y/277V - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-4559
Mfr. Part No.3C15UL
BrandAltech
£48.21
Each
Units
15A 3 - 480Y/277V - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-4969
Mfr. Part No.3D2UM
BrandAltech
£33.38
Each
Units
2A 3 - 480Y/277V - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 899-1774
Mfr. Part No.2E20UM
BrandAltech
£22.25
Each
Units
20A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, High Efficiency Motors, UL508 Application, Which have Exceedingly High Inrush Current Time Delay 10 kA MCCB - - - -
RS Stock No. 175-0394
Mfr. Part No.3130-FA2A-P7T1-W01Q-15A-A040001M
BrandETA
£30.95
Each
Units
15A 2 - 50 V dc, 240 V ac 36.5mm 3130 - - 2000 A @ 50 V dc, 3500 A @ 250 V ac - - 36mm 36 x 29.5mm 29.5mm
RS Stock No. 175-1534
Mfr. Part No.GV4PE12N
£321.00
Each
Units
12.5A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1486
Mfr. Part No.GV4LE80N
£286.00
Each
Units
80A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1563
Mfr. Part No.GV4PEM03S6
£448.00
Each
Units
3.5A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -