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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Omschrijving Prijs 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-stocknr. 175-1482
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5A 1 Thermomagnetic Device Circuit Breaker 50V dc 12.3mm CB - - - - - - - -
RS-stocknr. 175-1456
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3.5A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 660 → 690 V ac - - - - -
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300mA 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, High Efficiency Motors, UL508 Application, Which have Exceedingly High Inrush Current Time Delay 10 kA MCCB - - - -
RS-stocknr. 409-817
Fabrikantnummer1410-F110-P1F1-W14QB4-1A
FabrikantETA
15,35 €
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1A 1 - - 17mm 1410-F - - - - - - - -
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FabrikantSchurter
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FabrikantnummerGV4PEM12N
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12.5A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
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2.5A 3 - - 54.5mm 3140 - - - - - - - -
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15A 3 - 277V ac 2.25in W69 - - - - - - - -
RS-stocknr. 712-7660
Fabrikantnummer3120-F551-H7T1-W19DG4-16A
FabrikantETA
21,49 €
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16A 2 - - 25mm 3120 - - - - - - - -
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FabrikantnummerW28-XQ1A-20
FabrikantTE Connectivity
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20A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
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299,13 €
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80A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
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15A 1 - 600V ac - CX Photovoltaic Renewable Energy System, Power Distribution Equipment Short 3000 A @ 300 V dc MCCB - 19.3mm 19.3 x 52.37mm 52.4mm
RS-stocknr. 729-2795
Fabrikantnummer3120-F554-P7T1-W19DG4-5A
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Fabrikantnummer2800869
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1A 2 - 80V dc 24.6mm CB TM2 - - - - - - - -
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1A 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 - - - -
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50A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
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