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. 312-3774
Mfr. Part No.GB2DB06
$62.53
Each
units
1A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 312-3724
Mfr. Part No.GB2CB20
$86.12
Each
units
12A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1.5 kA - - - - -
RS Stock No. 782-7912
Mfr. Part No.W93-X112-50
$134.84
Each
units
50A 3 - 277V ac 2.25in W93 - - - - - - - -
RS Stock No. 272-814
Mfr. Part No.GV3L25
$269.30
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 458-8683
Mfr. Part No.1180-01-2A
BrandETA
$28.53
Each
units
2A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 774-0039
BrandRS PRO
$12.74
Each
units
16A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 312-3623
Mfr. Part No.GB2CB05
$82.81
Each
units
500mA 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 458-8712
Mfr. Part No.1180-01-4A
BrandETA
$19.75
Each
units
4A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 729-2855
Mfr. Part No.3600-P10-Si-10A
BrandETA
$114.40
Each
units
10A 1 - - 11.5mm 3600 - - - - - - - -
RS Stock No. 212-1890
Mfr. Part No.3130-F110-P7T1-W02Q-10A
BrandETA
$43.21
Each
units
10A 1 - - 36mm 3130 - - - - - - - -
RS Stock No. 712-7660
Mfr. Part No.3120-F551-H7T1-W19DG4-16A
BrandETA
$55.04
Each
units
16A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 728-8604
Mfr. Part No.104-PR-1.5A
BrandETA
$24.66
Each
units
1.5A 1 - - - 104-PR - - - - - - - -
RS Stock No. 782-0937
Mfr. Part No.W31-X2M1G-20
$38.59
Each
units
20A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
RS Stock No. 782-7859
Mfr. Part No.W92-X112-15
$75.95
Each
units
15A 2 - 277V ac 1.5in W92 - - - - - - - -
RS Stock No. 712-7679
Mfr. Part No.3120-F551-H7T1-W19DG4-20A
BrandETA
$41.24
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 273-4648
Mfr. Part No.8340-F410-P1M1-A3H0-15A
BrandETA
$64.06
Each
units
15A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 407-0750
Mfr. Part No.8340-F410-P1M1-A3H0-2.5A
BrandETA
$50.64
Each
units
2.5A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 286-4014
Mfr. Part No.3120-F551-H7T1-W02D-10A
BrandETA
$39.19
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 729-2795
Mfr. Part No.3120-F554-P7T1-W19DG4-5A
BrandETA
$37.30
Each
units
5A 2 - - - 3120-F - - - - - - - -
RS Stock No. 729-2798
Mfr. Part No.3120-F554-P7T1-W19DG4-10A
BrandETA
$46.26
Each
units
10A 2 - - - 3120-F - - - - - - - -
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