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. 170-3784
Mfr. Part No.0712123
R 419.40
Each (In a Box of 20)
units
250mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.25A - - - - - - - -
RS stock no. 782-8041
Mfr. Part No.W58-XB1A4A-8
R 135.36
Each
units
8A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 173-9851
Mfr. Part No.4411.0027
BrandSchurter
R 258.829
Each (In a Box of 20)
units
30A 1 - 240V ac 11.5mm T13 - - - - - - - -
RS stock no. 728-8620
Mfr. Part No.105-P10-5A
BrandETA
R 202.37
Each
units
5A 1 - - 14mm 105 - - - - - - - -
RS stock no. 782-6590
Mfr. Part No.W28-XQ1A-0.75
R 131.82
Each
units
750mA 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 782-0898
Mfr. Part No.W28-XQ1A-0.25
R 128.07
Each
units
250mA 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 284-6016
Mfr. Part No.4400.0034
BrandSchurter
R 167.90
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS stock no. 286-4008
Mfr. Part No.3120-F551-H7T1-W02D-5A
BrandETA
R 343.12
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS stock no. 173-9842
Mfr. Part No.4410.0152
BrandSchurter
R 349.241
Each (In a Box of 20)
units
16A 1 - 240V ac - T12 - - - - - - - -
RS stock no. 899-1869
Mfr. Part No.2G12UM
BrandAltech
R 506.03
Each
units
12A 2 - - - V-EA - Time Delay 10 kA MCCB - - - -
RS stock no. 782-8016
Mfr. Part No.W54-XB1A4A10-30
R 78.33
Each
units
30A 1 - 250V ac 0.575in W58 - - - - - - - -
RS stock no. 899-1471
Mfr. Part No.2D2UL
BrandAltech
R 730.87
Each
units
2A 2 - 480Y/277V - UL Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers Time Delay 10 kA MCCB - - - -
RS stock no. 286-4014
Mfr. Part No.3120-F551-H7T1-W02D-10A
BrandETA
R 440.32
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS stock no. 729-2717
Mfr. Part No.1410-G111-P2F1-S01-2A
BrandETA
R 199.14
Each
units
2A 1 - - 15.7mm 1410-G1 - - - - - - - -
RS stock no. 312-3689
Mfr. Part No.GB2CB12
R 406.88
Each
units
6A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS stock no. 729-2859
Mfr. Part No.3600-P10-Si-15A
BrandETA
R 1,319.60
Each
units
15A 1 - - 11.5mm 3600 - - - - - - - -
RS stock no. 729-2818
Mfr. Part No.3130-F130-P7T1-W02Q-10A
BrandETA
R 575.14
Each
units
10A 3 - - 41mm 3130 - - - - - - - -
RS stock no. 729-2758
Mfr. Part No.2-5700-IG2-P10-DD-000040-10A
BrandETA
R 400.42
Each
units
10A 1 - - 15.7mm 2 5700 - - - - - - - -
RS stock no. 899-4843
Mfr. Part No.3CU63L
BrandAltech
R 1,414.48
Each
units
63A 3 - 240V ac - L Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS stock no. 782-6569
Mfr. Part No.W33-T4B1Q-10
R 550.42
Each
units
10A 2 - 120V 21.59mm W33 - - - - - - - -