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. 728-8682
Mfr. Part No.1140-F111-P1M1-12A
BrandETA
MYR55.55
Each
units
12A 1 - - - 1140-F - - - - - - - -
RS Stock No. 898-1679
Mfr. Part No.1DU2R
BrandAltech
MYR48.32
Each
units
2A 1 - - - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 782-0911
Mfr. Part No.W28-XQ1A-3
MYR14.16
Each
units
3A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 782-0882
Mfr. Part No.W23-X1A1G-50
MYR91.18
Each
units
50A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 312-3803
Mfr. Part No.GB2DB09
MYR226.39
Each
units
4A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 3 (ac) kA - - - - -
RS Stock No. 898-3240
Mfr. Part No.15.904U
BrandAltech
MYR334.90
Each
units
630mA 3 - 480Y/277V - MA 3 Phase Transformers, Motors, Power Supplies Time Delayed 42 kA MCB - - - -
RS Stock No. 284-5883
Mfr. Part No.4400.0052
BrandSchurter
MYR36.14
Each
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-8029
Mfr. Part No.W58-XB1A4A-3
MYR35.89
Each
units
3A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 273-0860
Mfr. Part No.1658-G21-02-P10-10A
BrandETA
MYR22.09
Each
units
10A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 870-1039
Mfr. Part No.TS-701-HT-7
BrandSchurter
MYR11.21
Each (In a Pack of 100)
units
7A 1 - 50 V dc, 250 V ac - TS-701 - - 1000 A MCB 9.7mm 8.9mm 8.9 x 9.7 (Dia.)mm -
RS Stock No. 173-9832
Mfr. Part No.4400.0052
BrandSchurter
MYR23.39
Each (In a Box of 100)
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 409-889
Mfr. Part No.1610-21-10A
BrandETA
MYR30.47
Each
units
10A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 899-8810
Mfr. Part No.3DU16L
BrandAltech
MYR292.04
Each
units
16A 3 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 898-1742
Mfr. Part No.1DU8L
BrandAltech
MYR96.62
Each
units
8A 1 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 170-3791
Mfr. Part No.0712275
MYR65.69
Each (In a Box of 20)
units
6A 1 - 65 V dc, 250 V ac 8.2mm TCP 6A - - - - - - - -
RS Stock No. 899-1480
Mfr. Part No.2D30UM
BrandAltech
MYR131.51
Each
units
30A 2 - - - 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. 881-0864
Mfr. Part No.CA1-B0-36-660-321-D
MYR107.10
Each
units
60A 1 - - - C General Purpose Long 10000 A @ 277 V ac, 5000 A @ 125/250 V dc MCCB - 19.3mm 19.3 x 52.37mm 52.4mm
RS Stock No. 899-1711
Mfr. Part No.2DU63R
BrandAltech
MYR87.67
Each
units
63A 2 - 480Y/277V - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 868-9169
Mfr. Part No.4430.2078
BrandSchurter
MYR108.57
Each
units
10A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 728-8648
Mfr. Part No.106-P10-000040-3A
BrandETA
MYR75.60
Each
units
3A 1 - - - 106 - - - - - - - -
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