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. 881-1362
Mfr. Part No.FA1-B0-16-815-32A-BG
PHP6,565.31
Each
units
150A 1 - - - F Battery Disconnect Systems, Higher Amperage Applications, Ideal for Applications Under Extreme Temperatures, Military, Solar Power Systems Long 10000 A @ 277 V ac, 50000 A @ 125 V dc MCCB - 38.3mm 38.29 x 59.13mm 59.1mm
RS Stock No. 286-4092
Mfr. Part No.3120-F521-H7T1-W01D-1A
BrandETA
PHP1,373.23
Each
units
1A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 881-1344
Mfr. Part No.EA4-X0-03-204-52E-GB
PHP11,841.50
Each
units
100A 4 - - - E Generators, Ideal for Higher Current and Voltage Applications, Industrial Appliances, Military, Renewable Energy Systems - 5000 A @ 125 V dc, 5000 A @ 240 Vac MCCB - 106.3mm 106.3 x 69.85mm 69.9mm
RS Stock No. 728-8686
Mfr. Part No.1140-F111-P1M1-16A
BrandETA
PHP667.34
Each
units
16A 1 - - - 1140-F - - - - - - - -
RS Stock No. 881-1136
Mfr. Part No.CMB-053-11C3N-B-A
PHP152.36
Each
units
5A 1 - - - CMB Audio Visual Equipment, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Transportation Time Delayed 2500 A @ 32 V dc - - 10mm 10 x 11.2mm 11.2mm
RS Stock No. 881-1038
Mfr. Part No.CA3-B0-34-650-121-C
PHP4,178.96
Each
units
50A 3 - - - C General Purpose Medium 10000 A @ 277 V ac, 5000 A @ 125/250 V dc MCCB - 57.9mm 57.91 x 52.37mm 52.4mm
RS Stock No. 774-0077
Mfr. Part No.FC67200
PHP166.56
Each
units
1A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 409-851
Mfr. Part No.1410-F110-P1F1-W14QB4-8A
BrandETA
PHP700.09
Each
units
8A 1 - - 17mm 1410-F - - - - - - - -
RS Stock No. 122-9303
Mfr. Part No.3400-P10-H-SI-10A
BrandETA
PHP2,406.15
Each
units
10A 1 - - 42mm 3400 - - - - - - - -
RS Stock No. 868-9147
Mfr. Part No.4430.1564
BrandSchurter
PHP1,924.344
Each (In a Pack of 14)
units
5A 2 - 60 V dc, 240 V ac - TA45-2RU Industrial Appliances, Power Supplies, Power Tools - 1 kA MCB - - - 21.7mm
RS Stock No. 868-9358
Mfr. Part No.4435.0039
BrandSchurter
PHP727.93
Each
units
5A 2 - 60 V dc, 240 V ac - TA35 Cleaning Equipment, Commercial and Household Kitchen Appliances, Equipment for Construction, Industrial Appliances, Power Tools - 2 kA MCB - 34mm 34 x 26mm 26mm
RS Stock No. 899-8882
Mfr. Part No.3DU50R
BrandAltech
PHP1,776.24
Each
units
50A 3 - 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. 868-8829
Mfr. Part No.4404.0019
BrandSchurter
PHP99.904
Each (In a Pack of 10)
units
4A 1 - - - T9-311 Household Appliances, HVAC, Industrial Appliances, Medical, Power Supplies, Power Tools, Uninterruptible Power Supply - 2 kA MCB 9.6mm 8.9mm 8.9 x 9.6 (Dia.)mm -
RS Stock No. 409-895
Mfr. Part No.1610-21-15A
BrandETA
PHP380.92
Each
units
15A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 898-1727
Mfr. Part No.1DU5R
BrandAltech
PHP574.52
Each
units
5A 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. 344-5361
Mfr. Part No.3140-F130-P7T1-SGRX-5A
BrandETA
PHP2,462.83
Each
units
5A 3 - - 61.6mm 3140 - - - - - - - -
RS Stock No. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
PHP387.60
Each
units
15A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 782-7950
Mfr. Part No.W58-XC4C12A-10
PHP315.43
Each
units
10A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 899-8747
Mfr. Part No.3D63UL
BrandAltech
PHP4,143.60
Each
units
63A 3 - 240V ac - UL Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers Time Delay 10 kA MCCB - - - -
RS Stock No. 729-2802
Mfr. Part No.3120-F554-P7T1-W19DG4-16A
BrandETA
PHP1,447.93
Each
units
16A 2 - - - 3120-F - - - - - - - -
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