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庫存編號 335-968
製造零件編號106-P30-000040-5A
BrandETA
HK$93.33
單位
5A 1 - - 19mm 106-P30 - - - - - - - -
RS庫存編號 333-265
製造零件編號201-5A
BrandETA
HK$291.02
單位
5A 1 - - 80mm 201 - - - - - - - -
RS庫存編號 409-851
製造零件編號1410-F110-P1F1-W14QB4-8A
BrandETA
HK$98.31
單位
8A 1 - - 17mm 1410-F - - - - - - - -
RS庫存編號 312-3774
製造零件編號GB2DB06
HK$295.00
單位
1A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS庫存編號 898-1948
製造零件編號1P16UL3/6
BrandAltech
HK$90.14
單位
115A - - - - IP16 - - - - - - - -
RS庫存編號 898-4776
製造零件編號1CR6L
BrandAltech
HK$207.40
單位
6A 1 - 240V ac - L Control Circuit, Lighting, Low Inrush Motors, Receptacles, Resistive Loads, Wiring Protection Time Delayed 10 kA Miniature Molded Case - - - -
RS庫存編號 881-1328
製造零件編號EA3-B0-24-810-22A-DC
HK$749.30
單位
100A 3 - - - E Generators, Ideal for Higher Current and Voltage Applications, Industrial Appliances, Military, Renewable Energy Systems Medium 5000 A @ 125 V dc, 5000 A @ 240 Vac MCCB - 79.7mm 79.7 x 69.85mm 69.9mm
RS庫存編號 333-237
製造零件編號201-1A
BrandETA
HK$306.74
單位
1A 1 - - 80mm 201 - - - - - - - -
RS庫存編號 608-8769
製造零件編號GV3ME80
HK$2,509.88
單位
- 3 TeSys 690V ac 61mm GV3M - - 100 kA - - - - -
RS庫存編號 333-243
製造零件編號201-2A
BrandETA
HK$282.98
單位
2A 1 - - 80mm 201 - - - - - - - -
RS庫存編號 333-259
製造零件編號201-3A
BrandETA
HK$281.97
單位
3A 1 - - 80mm 201 - - - - - - - -
RS庫存編號 868-9184
製造零件編號4430.2295
BrandSchurter
HK$204.00
/個 (每包:20個)
單位
5 A, 500 A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS庫存編號 782-6565
製造零件編號W28-XT1A-15
HK$27.89
單位
15A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS庫存編號 868-9080
製造零件編號4430.0885
BrandSchurter
HK$228.78
單位
- - - - - - - - - - - - - -
RS庫存編號 729-2855
製造零件編號3600-P10-Si-10A
BrandETA
HK$444.78
單位
10A 1 - - 11.5mm 3600 - - - - - - - -
RS庫存編號 323-9009
製造零件編號GB2CD07
HK$295.00
單位
2A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS庫存編號 405-9129
製造零件編號2-5700-IG1-P10-DD-000040-2.5A
BrandETA
HK$141.21
單位
2.5A 1 - - 29mm 2-5700 - - - - - - - -
RS庫存編號 898-2616
製造零件編號1C20UM
BrandAltech
HK$143.65
單位
20A 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庫存編號 286-0719
製造零件編號3120-F551-H7T1-W02D-16A
BrandETA
HK$143.83
單位
16A 2 - - 25mm 3120 - - - - - - - -
RS庫存編號 272-937
製造零件編號GV3P65
HK$1,361.25
單位
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -