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. 608-8769
Mfr. Part No.GV3ME80
MYR1,658.49
Each
units
- 3 TeSys 690V ac 61mm GV3M - - 100 kA - - - - -
RS Stock No. 898-1676
Mfr. Part No.1DU2L
BrandAltech
MYR104.97
Each
units
2A 1 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 272-921
Mfr. Part No.GV3P40
MYR1,034.89
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
MYR1,138.85
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 898-2638
Mfr. Part No.1C2UM
BrandAltech
MYR79.36
Each
units
2A 1 - 42 V dc, 277 V ac - V-EA Appliances, Business Equipment, Control Circuit, Lighting, Low Inrush Motors, Wiring Protection Time Delayed 10 kA MCB - - - -
RS Stock No. 782-7990
Mfr. Part No.W58-XB1A4A-25
MYR19.31
Each
units
25A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 272-943
Mfr. Part No.GV3P50
MYR1,128.79
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 333-271
Mfr. Part No.201-10A
BrandETA
MYR219.08
Each
units
10A 1 - - 80mm 201 - - - - - - - -
RS Stock No. 417-026
Mfr. Part No.1110-F112-P1M1-16A
BrandETA
MYR73.75
Each
units
16A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 312-3881
Mfr. Part No.GB2DB22
MYR285.71
Each
units
20A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 286-4008
Mfr. Part No.3120-F551-H7T1-W02D-5A
BrandETA
MYR88.04
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 881-0401
Mfr. Part No.1656660
MYR29.61
Each
units
- - - - - VS-SI-BZ - - - - - - - -
RS Stock No. 610-0910
Mfr. Part No.GB2CD16
MYR179.54
Each
units
10A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 782-7865
Mfr. Part No.W67-X2Q12-20
MYR110.36
Each
units
20A 1 - 277V ac 0.75in W67 - - - - - - - -
RS Stock No. 782-0915
Mfr. Part No.W58-XB1A4A-5
MYR26.65
Each
units
5A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 272-909
Mfr. Part No.GV3P25
MYR1,580.20
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 286-0832
Mfr. Part No.3120-F521-H7T1-W01D-5A
BrandETA
MYR123.57
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 782-0918
Mfr. Part No.W58-XB1A4A-30
MYR28.22
Each
units
30A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 335-980
Mfr. Part No.106-P30-000040-3A
BrandETA
MYR46.22
Each
units
3A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 335-996
Mfr. Part No.106-P30-000040-2A
BrandETA
MYR53.71
Each
units
2A 1 - - 19mm 106-P30 - - - - - - - -
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