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 898-4912
製造零件編號1CU63L
BrandAltech
HK$207.40
單位
63A 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 899-3455
製造零件編號2D20UM
BrandAltech
HK$295.29
單位
20A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
RS庫存編號 868-9210
製造零件編號4430.2306
BrandSchurter
HK$253.17
單位
20A - - 220 → 240V - - - - - MCB - - - -
RS庫存編號 899-9116
製造零件編號3P16UL3/18
BrandAltech
HK$362.37
單位
115A - - - - 3P16 - - - - - - - -
RS庫存編號 899-8863
製造零件編號3DU40L
BrandAltech
HK$639.79
單位
40A 3 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS庫存編號 898-4915
製造零件編號1CU63R
BrandAltech
HK$95.81
單位
63A 1 - 48 V dc, 277 V ac - R Appliances, Business Equipment, Control Circuit, Lighting, Power Supplies, Sensitive Electronics, Wiring Protection Time Delayed 10 kA MCB - - - -
RS庫存編號 899-1588
製造零件編號2DU05L
BrandAltech
HK$353.83
單位
500mA 2 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS庫存編號 899-4710
製造零件編號3CU02L
BrandAltech
HK$530.67
單位
200mA 3 - - - L Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 899-8867
製造零件編號3DU40R
BrandAltech
HK$295.29
單位
40A 3 - 480Y/277V - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
RS庫存編號 898-4943
製造零件編號1D10UL
BrandAltech
HK$207.40
單位
10A 1 - 277V ac - UL Heaters, High Inrush Motors, Power Supplies, Reactive Loads, Transformers Time Delayed 10 kA MCB - - - -
RS庫存編號 409-750
製造零件編號1410-L210-L2F1-S02-0.63A
BrandETA
HK$78.75
單位
630mA 1 - - 33mm 1410-L - - - - - - - -
RS庫存編號 729-2758
製造零件編號2-5700-IG2-P10-DD-000040-10A
BrandETA
HK$195.49
單位
10A 1 - - - 2 5700 - - - - - - - -
RS庫存編號 868-9213
製造零件編號4430.2304
BrandSchurter
HK$258.49
單位
10A - - 220 → 240V - - - - - MCB - - - -
RS庫存編號 899-9119
製造零件編號3P16UL3/6
BrandAltech
HK$143.89
單位
115A - - - - 3P16 - - - - - - - -
RS庫存編號 898-4919
製造零件編號1CU6L
BrandAltech
HK$191.47
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 782-6597
製造零件編號W28-XQ1A-4
HK$23.94
單位
4A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS庫存編號 899-4861
製造零件編號3CU8R
BrandAltech
HK$265.34
單位
8A 3 - 480Y/277V - R Appliance Circuit, Appliances, Business Equipment, Control Circuit Application, Lighting, Power Supplies, Sensitive Electronics, UL1077 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 899-1620
製造零件編號2DU1L
BrandAltech
HK$353.83
單位
1A 2 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS庫存編號 175-0394
製造零件編號3130-FA2A-P7T1-W01Q-15A-A040001M
BrandETA
HK$328.30
單位
15A 2 - 50 V dc, 240 V ac 26mm 3130 - - 2000 A @ 50 V dc, 3500 A @ 250 V ac - - 36mm 36 x 29.5mm 29.5mm
RS庫存編號 170-3784
製造零件編號0712123
HK$137.43
個 (以毎盒:20)
單位
250mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.25A - - - - - - - -