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 870-1001
製造零件編號TS-701-HT-12
BrandSchurter
HK$18.74
/個 (每包:100個)
單位
12A 1 - 50 V dc, 250 V ac - TS-701 - - 1000 A MCB 9.7mm 8.9mm 8.9 x 9.7 (Dia.)mm -
RS庫存編號 898-2357
製造零件編號1B13UM
BrandAltech
HK$144.03
單位
13A 1 - 42 V dc, 277 V ac - V-EA Control Circuit, Industrial, Lighting, Motors, Solenoids, Transformers, Wiring Time Delayed 10 kA MCB - - - -
RS庫存編號 212-2168
製造零件編號3130-F110-P7T1-W14QR7-12A
BrandETA
HK$170.24
單位
12A 1 - 50 V dc, 250 V ac 36mm 3130 - - - - - - - -
RS庫存編號 899-8879
製造零件編號3DU4R
BrandAltech
HK$296.24
/個 (每包:4個)
單位
4A 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 175-0379
製造零件編號REX12D-TA2-100-DC24V-4A/4A
BrandETA
HK$572.72
單位
4A - - 24V dc 98.5mm REX12D-T - - - - - - - -
RS庫存編號 899-4376
製造零件編號3B20UM
BrandAltech
HK$398.08
單位
20A 3 - 480Y/277V - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Appliances, Business Equipment, Control Circuits, Electronic Applications, Lighting, Motors, UL508 Applications, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 868-9226
製造零件編號4430.2309
BrandSchurter
HK$175.85
單位
15A - - 125/250V - - - - - MCB - - - -
RS庫存編號 739-6890
製造零件編號3120-F22F-H7T1-SGRX-15A-U0000M
BrandETA
HK$423.05
單位
15A 2 - - 35.4mm 3120 - - - - - - - -
RS庫存編號 801-6898
製造零件編號0712152
HK$150.60
單位
500mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.5A - - - - - - - -
RS庫存編號 898-4925
製造零件編號1CU8R
BrandAltech
HK$95.98
單位
8A 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 899-4947
製造零件編號3D20UM
BrandAltech
HK$398.08
單位
20A 3 - 480Y/277V - 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 899-3082
製造零件編號2C25UL
BrandAltech
HK$443.80
單位
25A 2 - 480Y/277V - UL 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 175-1565
製造零件編號GV4PEM07N6
HK$4,242.48
單位
7A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS庫存編號 774-0011
製造零件編號FC6607A
HK$57.50
單位
7A - - - 11mm A-0709 - - - - - - - -
RS庫存編號 774-0033
製造零件編號FC6624
HK$28.65
單位
4A - - - 14.1mm A-0709 - - - - - - - -
RS庫存編號 868-9358
製造零件編號4435.0039
BrandSchurter
HK$159.51
單位
5A 2 - 60 V dc, 240 V ac - TA35 Cleaning Equipment, Commercial and Household Kitchen Appliances, Equipment for Construction, Industrial Appliances, Power Tools - 2 kA MCB - 34mm 34 x 26mm 26mm
RS庫存編號 899-3521
製造零件編號2Z03UM
BrandAltech
HK$507.91
單位
300mA 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Components which Fail-Short, Components/Devices with Low Surge Current and Short Circuit Withstand Capabilities, Semiconductors, UL508 Application Time Delay 10 kA MCCB - - - -
RS庫存編號 898-1714
製造零件編號1DU50R
BrandAltech
HK$98.05
單位
50A 1 - - - 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 212-2225
製造零件編號3130-F110-P7T1-W19QY7-5A
BrandETA
HK$304.65
單位
5A 1 - - 36mm 3130 - - - - - - - -
RS庫存編號 881-0877
製造零件編號CA1-B0-36-680-321-L
HK$351.55
單位
80A 1 - - - C General Purpose Long 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 19.3mm 19.3 x 52.37mm 52.4mm