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 Prix 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
N° de stock RS 729-2770
Référence fabricant3120-F554-P7T1-W02D-5A
MarqueETA
27,48 €
Each
Unité
5A 2 - - - 3120-F - - - - - - - -
N° de stock RS 405-9179
Référence fabricant2-5700-IG1-P10-DD-000040-20A
MarqueETA
19,73 €
Each
Unité
20A 1 - - 29mm 2-5700 - - - - - - - -
N° de stock RS 336-012
Référence fabricant106-P30-000040-1A
MarqueETA
8,49 €
Each
Unité
1A 1 - - 19mm 106-P30 - - - - - - - -
N° de stock RS 273-0854
Référence fabricant1658-G21-02-P10-5A
MarqueETA
7,17 €
Each
Unité
5A 1 - - 32mm 1658 - - - - - - - -
N° de stock RS 881-0947
Référence fabricantCA2-B0-34-630-121-D
47,84 €
Each
Unité
30A 2 - - - C General Purpose Medium 10000 A @ 277 V ac, 5000 A @ 125/250 V dc MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
N° de stock RS 868-8796
Référence fabricant4400.0098
MarqueSchurter
5,583 €
Each (In a Pack of 100)
Unité
3 A, 300 mA 1 - 48 V dc, 240 V ac - T11 - - - - - - - -
N° de stock RS 881-0956
Référence fabricantCA2-B0-34-630-221-C
104,78 €
Each (In a Pack of 2)
Unité
30A 2 - - - C General Purpose Medium 10000 A @ 277 V ac, 5000 A @ 125/250 V dc MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
N° de stock RS 728-8654
Référence fabricant106-P10-000040-10A
MarqueETA
15,15 €
Each
Unité
10A 1 - - - 106 - - - - - - - -
N° de stock RS 868-9042
Référence fabricant4430.0034
MarqueSchurter
15,609 €
Each (In a Pack of 20)
Unité
16A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
N° de stock RS 899-8905
Référence fabricant3DU63R
MarqueAltech
36,96 €
Each
Unité
63A 3 - 480Y/277V - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
N° de stock RS 899-1639
Référence fabricant2DU1R
MarqueAltech
20,47 €
Each
Unité
1A 2 - 480Y/277V - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
N° de stock RS 899-2941
Référence fabricant2BU1R
MarqueAltech
23,13 €
Each
Unité
1A 2 - 480Y/277V - R Appliance Circuit, Appliances, Business Equipment, Control Circuits and Some Electronic Applications, Lighting, Power Supplies, Sensitive Electronics, UL1077 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
N° de stock RS 282-8743
Référence fabricant2210-T210-K0M1-H121-1A
MarqueETA
39,58 €
Each
Unité
1A 1 - - 83.5mm 2210 - - - - - - - -
N° de stock RS 333-265
Référence fabricant201-5A
MarqueETA
39,44 €
Each
Unité
5A 1 - - 80mm 201 - - - - - - - -
N° de stock RS 272-943
Référence fabricantGV3P50
219,90 €
Each
Unité
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
N° de stock RS 272-909
Référence fabricantGV3P25
158,53 €
Each
Unité
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
N° de stock RS 312-3796
Référence fabricantGB2DB08
36,73 €
Each
Unité
3A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 10 (ac) kA - - - - -
N° de stock RS 312-3768
Référence fabricantGB2DB05
36,73 €
Each
Unité
500mA 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
N° de stock RS 458-8728
Référence fabricant1180-01-6A
MarqueETA
17,34 €
Each
Unité
6A 1 - - 24.4mm 1180 - - - - - - - -
N° de stock RS 728-8648
Référence fabricant106-P10-000040-3A
MarqueETA
15,15 €
Each
Unité
3A 1 - - - 106 - - - - - - - -