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. 774-0045
BrandRS PRO
MYR16.17
Each
units
6A - - 32 V dc, 240 V ac 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0036
BrandRS PRO
MYR38.25
Each
units
13A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0039
BrandRS PRO
MYR38.25
Each
units
16A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0051
BrandRS PRO
MYR30.57
Each
units
9A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0020
BrandRS PRO
MYR33.37
Each
units
8A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0067
BrandRS PRO
MYR16.13
Each
units
16A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0023
BrandRS PRO
MYR34.37
Each
units
9A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0042
BrandRS PRO
MYR16.81
Each
units
5A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0099
BrandRS PRO
MYR22.02
Each
units
2.2A 2 - 250V ac 6mm AN - - - - - - - -
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
MYR1,014.19
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
MYR1,116.07
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
MYR21.24
Each
units
25A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 272-943
Mfr. Part No.GV3P50
MYR1,106.21
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 417-026
Mfr. Part No.1110-F112-P1M1-16A
BrandETA
MYR71.60
Each
units
16A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 333-271
Mfr. Part No.201-10A
BrandETA
MYR139.10
Each
units
10A 1 - - 80mm 201 - - - - - - - -
RS Stock No. 881-0401
Mfr. Part No.1656660
MYR23.03
Each
units
- - - - - VS-SI-BZ - - - - - - - -
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 - - - - -
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DIN rail mounted, mechanically reset protection devices.Short circuit and overload protection for control circuits and associated industrial equipment, e.g. solenoid valves, electric brakes and transformers, etcRated operational voltage of 415V74mm high; depth 67mm (1P) 70mm (2P).