MCBs

pMCBs, or miniature circuit breakers, are a type of switch used to automatically turn off electrical circuits during abnormal conditions. MCBs often replace fuses in low voltage electrical circuits as they can be more reliable, much more sensitive and are resettable./p h2How an MCB Works/h2 pWhen continuous overcurrent flows through an MCB, a bimetallic strip is heated and causes it to bend. This bending of the bimetallic strip releases a mechanical latch opening the contacts and turning off the MCB, thereby stopping the current to flow in the circuit. To restart the flow of current the MCB must be manually turned on. This mechanism protects the MCB from faults arising due to overcurrent or overload and is intended to prevent the accidental overloading of the cable in a no-fault situation. The speed of the MCB tripping will vary with the degree of the overload. This is usually achieved by the use of a thermal device in the MCB. The second characteristic is the magnetic fault protection, which is intended to operate when the fault reaches a predetermined level and to trip the MCB within one-tenth of a second. The level of this magnetic trip gives the MCB its type characteristic./p pMCBs are used to perform many functions such as local control switches, isolating switches against faults and overload protection devices for installation or specific equipment or appliances./p h2MCB Types/h2 pMCBs have three common types for circuit protection in residential, commercial and industrial applications. The use is classified by a type, which determines the tripping characteristics of the MCB:/p strongpType B - trips between 3 and 5 times the load currentstrong/p/strong pThis type will trip instantly at a rate of three to five times its rated current. These are normally used for resistive or small inductive loads where switching surges are very small. Therefore, these are suitable for residential or light commercial installations./p strongpType C - trips between 5 and 10 times the full load currentstrong/p/strong pThis type will trip instantly at a rate of five to ten times its rated current. These are normally used for high inductive loads where switching surges are high such as small motors and fluorescent lighting. In such cases, type C MCBs are preferred to handle higher value of short circuit currents. Therefore, these are suitable for highly inductive commercial and industrial installations./p strongpType D - trips between 10 and 20 times the full load currentstrong/p/strong pThis type will trip instantly at a rate of ten to twenty-five times its rated current. These are normally used for very high inductive loads where high inrush current is very frequent. These are suitable for specific industrial and commercial applications. The common examples of such applications include x-ray machines, UPS systems, industrial welding equipment, large winding motors, etc./p h2How to select a suitable MCB for the application?/h2 pFocus on 3 main points to choose the right MCB for the electrical circuit/p olliAmpere rating/li liShort circuit breaking cap

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Description Price Number of Poles Current Rating Model Number Range Series Rated AC Voltage Tripping Characteristics Breaking Capacity Mounting Style Rated DC Voltage Length Width Depth Application
RS庫存編號 772-1410
製造零件編號5SY4506-6
BrandSiemens
HK$432.60
單位
1 + N 6 A - Sentron 5SY4 230 V Type B 10 kA - - 90mm 36mm 76mm -
RS庫存編號 521-4945
製造零件編號5SY6103-7
BrandSiemens
HK$156.28
單位
1 3 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS庫存編號 922-6967
製造零件編號FAZ-B6/1
BrandEaton
HK$161.98
單位
1 6 A - XEffect FAZ 240 V Type B 10 kA - 48V 17.8mm 65.5mm 80mm Appliances, Business Equipment, Control Circuit, Lighting, Supplementary Protection
RS庫存編號 814-7435
製造零件編號60109
HK$711.49
單位
1 8 A - - C60 120 → 240 V Type C 10 kA rms @ 240 V ac, 10 kA rms @ 60 V dc - 60V 107mm 18mm 78.5mm -
RS庫存編號 535-5995
製造零件編號2CDS271001R0165
BrandABB
HK$112.82
單位
1 16 A - System M Pro S200 253 V Type B 10 kA - 72V 88mm 17.5mm 75.8mm -
RS庫存編號 791-3354
製造零件編號A9F54240
HK$630.42
單位
2 40 A - Acti 9 iC60H 12 → 133 V, 220 → 240 V, 380 → 415 V, 440 V Type C 10 kA DIN Rail 100 → 133V 85mm 36mm 78.5mm -
RS庫存編號 825-5762
製造零件編號P1MB2PD20
BrandLovato
HK$230.12
單位
2 20 A - ModuLo P1MB 230 V, 400 V Type D 10 kA - 80V 86.5mm 36mm 79.52mm -
RS庫存編號 864-4361
製造零件編號PLSM-C20/2-MW
HK$393.74
單位
2 20 A - XPole PLSM 230 V ac Type C 10 kA - 48V 35mm 80mm 75mm -
RS庫存編號 622-0014
製造零件編號5SY4102-7
BrandSiemens
HK$194.67
單位
1 2 A - Sentron 5SY4 230 V, 400 V Type C 10 kA - - 89.8mm 17.6mm 76.4mm -
RS庫存編號 791-3284
製造零件編號A9F54102
HK$235.89
單位
1 2 A - Acti 9 iC60H 12 → 60 V, 100 → 133 V, 220 → 240 V Type C 10 kA DIN Rail 12 → 48 V, 72 V 85mm 18mm 78.5mm -
RS庫存編號 489-6603
製造零件編號5SY6110-7
BrandSiemens
HK$130.48
單位
1 10 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS庫存編號 535-4251
製造零件編號2CDS273001R0064
BrandABB
HK$644.71
單位
3 6 A - System M Pro S200 440 V Type C 10 kA - - - - 75.8mm -
RS庫存編號 791-3293
製造零件編號A9F54110
HK$175.09
單位
1 10 A - Acti 9 iC60H 12 → 60 V, 100 → 133 V, 220 → 240 V Type C 10 kA DIN Rail 12 → 48 V, 72 V 85mm 18mm 78.5mm -
RS庫存編號 776-3073
製造零件編號A9N18367
HK$4,913.31
單位
3 100 A - Acti 9 C120N 440 V Type C 10 kA, 20 kA - ≤375V 81mm 73mm 81mm -
RS庫存編號 772-1303
製造零件編號5SY4210-7
BrandSiemens
HK$491.40
單位
2 10 A - Sentron 5SY4 400 V Type C 10 kA - - 90mm 36mm 76mm -
RS庫存編號 521-4917
製造零件編號5SY6101-7
BrandSiemens
HK$151.73
單位
1 1 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS庫存編號 746-7699
製造零件編號S202-C2
BrandABB
HK$292.61
單位
2 2 A - System M Pro S200 400 V Type C 6 kA - - - 35mm 69mm -
RS庫存編號 776-3458
製造零件編號A9F77120
HK$293.25
單位
1 20 A - Acti 9 iC60N 240 V Type C 10 kA - 72V - 78.5mm 85mm -
RS庫存編號 521-4939
製造零件編號5SY6102-7
BrandSiemens
HK$147.70
單位
1 2 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS庫存編號 814-7469
製造零件編號60143
HK$1,520.22
單位
2 8 A - - C60 120 → 240 V Type C 10 kA rms @ 125 V dc, 20 kA rms @ 240 V ac - 125V 107mm 36mm 78.5mm -