Molded Case Circuit Breakers
Molded case circuit breakers protect various electrical circuits and equipment from overcurrents and short circuits. These breakers consist of a molded case housing that encloses the circuit
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A| Style | Model | MPN | Price | |
|---|---|---|---|---|
| A | MDL3600WA0505S0905 | €26,560.51 | RFQ | |
| A | MDL3800VA05S01 | €23,324.10 | RFQ |
| Style | Model | Number Of Poles | Price | |
|---|---|---|---|---|
| A | 1491D72G11 | €3,115.84 | ||
| A | 1491D72G14 | €3,428.09 | ||
| A | 1491D72G13 | €3,115.84 | ||
| A | 1491D72G15 | €3,115.84 | ||
| A | 1491D72G12 | €3,115.84 | ||
| A | 1491D72G16 | €3,735.07 |
LHL Series Molded Case Circuit Breakers
Square D LHL Series circuit breakers are designed for protection from short circuits and current overloads. They feature a thermal magnetic trip unit to provide both instantaneous and long-time current limiting protection and are equipped with line & load side lug terminals to allow feed-thru connection. These UL listed circuit breakers deliver a high interrupting capacity of 35kA at 480V and a maximum current rating of 400A. They come with a molded case to hold current-carrying components, trip devices and other mechanisms in a compact space.
Square D LHL Series circuit breakers are designed for protection from short circuits and current overloads. They feature a thermal magnetic trip unit to provide both instantaneous and long-time current limiting protection and are equipped with line & load side lug terminals to allow feed-thru connection. These UL listed circuit breakers deliver a high interrupting capacity of 35kA at 480V and a maximum current rating of 400A. They come with a molded case to hold current-carrying components, trip devices and other mechanisms in a compact space.
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J| Style | Model | Amps | High Amp Trip Setting | Low Amp Trip Setting | Number Of Poles | Circuit Breaker Type | Frame Size | Ac Voltage Rating | Phase | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | LHL36000M | €4,232.45 | |||||||||
| B | LHL36125 | €4,232.45 | |||||||||
| C | LHL36150 | €4,232.45 | |||||||||
| D | LHL36175 | €4,201.55 | |||||||||
| E | LHL36200 | €4,232.45 | |||||||||
| F | LHL36225 | €4,761.53 | |||||||||
| G | LHL36300 | - | RFQ | ||||||||
| H | LHL36400 | €4,232.45 | |||||||||
| I | LHL36250 | €4,761.53 | |||||||||
| J | LHL36300-1021 | - | RFQ | ||||||||
| I | LHL36350 | €4,232.45 | |||||||||
| J | LHL36400-1021 | - | RFQ | ||||||||
| J | LHL36400MB | €4,232.45 |
Circuit Breaker: THED Series
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F| Style | Model | Number Of Poles | Amps | Ac Voltage Rating | Phase | Phase Connection | Voltage | Aic Rating | Dc Voltage Rating | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | THED113015WL | €1,059.80 | |||||||||
| B | THED113020 | - | RFQ | ||||||||
| A | THED113020WL | €1,091.08 | |||||||||
| B | THED113030 | - | RFQ | ||||||||
| A | THED113030WL | €970.70 | |||||||||
| A | THED113025WL | €1,147.82 | |||||||||
| C | THED124015WL | €2,794.36 | |||||||||
| C | THED124020WL | €2,794.36 | |||||||||
| D | THED124040WL | €358.20 | RFQ | ||||||||
| D | THED124050WL | €358.20 | RFQ | ||||||||
| C | THED124030WL | €2,656.27 | |||||||||
| C | THED124025WL | €2,794.36 | |||||||||
| E | THED136030WL | €1,327.21 | |||||||||
| E | THED136025WL | €1,327.21 | |||||||||
| E | THED136020WL | €1,327.21 | |||||||||
| F | THED136035WL | €1,327.21 | |||||||||
| F | THED136040WL | €1,415.59 | |||||||||
| F | THED136045WL | €1,415.59 | |||||||||
| F | THED136050WL | €1,415.59 | |||||||||
| F | THED136090WL | €1,662.19 | |||||||||
| F | THED136100WL | €1,662.19 | |||||||||
| F | THED136110WL | €2,886.46 | |||||||||
| F | THED136125WL | €2,886.46 | |||||||||
| F | THED136150WL | €2,886.46 |
Spectra Circuit Breakers, SKLA
General Electric Spectra Series moulded case circuit breakers are suitable for reverse feed applications and protection against short circuits & overloads. Spectra SKLA cricuit breakers feature a solid-state trip system & front-mounted plugs to change the breaker current ratings and a bolt-on mounting design for easy installation in both horizontal & vertical orientations. The breakers are equipped with an interchangeable RMS trip unit for providing instantaneous, long-time and short-time trip functions and use digital sampling to find the RMS value of sinusoidal & non-sinusoidal currents. They can accommodate aluminium wires of sizes up to 500 kcmil. SKLA breakers are available in 800A and 1200A current ratings on Raptor Supplies.
General Electric Spectra Series moulded case circuit breakers are suitable for reverse feed applications and protection against short circuits & overloads. Spectra SKLA cricuit breakers feature a solid-state trip system & front-mounted plugs to change the breaker current ratings and a bolt-on mounting design for easy installation in both horizontal & vertical orientations. The breakers are equipped with an interchangeable RMS trip unit for providing instantaneous, long-time and short-time trip functions and use digital sampling to find the RMS value of sinusoidal & non-sinusoidal currents. They can accommodate aluminium wires of sizes up to 500 kcmil. SKLA breakers are available in 800A and 1200A current ratings on Raptor Supplies.
A| Style | Model | Number Of Poles | Voltage Type | Frame Type | Voltage | Aic Rating | Price | |
|---|---|---|---|---|---|---|---|---|
| A | SKLA36AI0800 | - | RFQ | |||||
| A | SKLA36AI1200 | €7,949.12 | RFQ |
A| Style | Model | Number Of Poles | Voltage Type | Frame Type | Voltage | Aic Rating | Price | |
|---|---|---|---|---|---|---|---|---|
| A | SGLA36AI0400 | €3,084.75 | RFQ | |||||
| A | SGLA36AI0600 | €4,635.59 | RFQ |
SGHA Series Circuit Breakers
General Electric SGHA Series circuit breakers are ideal for use with electrical control panels and switchboards for protecting electrical circuits against current overloads and short circuits. These UL-listed molded case circuit breakers feature an RMS trip unit with instantaneous, short time & long time current limiting functions for reacting against severe power surges while avoiding tripping on mild overloads. They are further integrated with a bolt-on mounting design for ease-of-installation and lug terminals for hassle-free wiring. Choose from a broad range of these double- / triple-pole circuit breakers available in amperage ratings ranging from 400 to 600A on Raptor Supplies.
General Electric SGHA Series circuit breakers are ideal for use with electrical control panels and switchboards for protecting electrical circuits against current overloads and short circuits. These UL-listed molded case circuit breakers feature an RMS trip unit with instantaneous, short time & long time current limiting functions for reacting against severe power surges while avoiding tripping on mild overloads. They are further integrated with a bolt-on mounting design for ease-of-installation and lug terminals for hassle-free wiring. Choose from a broad range of these double- / triple-pole circuit breakers available in amperage ratings ranging from 400 to 600A on Raptor Supplies.
A| Style | Model | Number Of Poles | Voltage Type | Frame Type | Voltage | Aic Rating | Price | |
|---|---|---|---|---|---|---|---|---|
| A | SGHA26AT0400 | €1,851.07 | RFQ | |||||
| A | SGHA26AT0600 | €2,919.64 | RFQ |
A| Style | Model | Number Of Poles | Voltage Type | Frame Type | Voltage | Aic Rating | Price | |
|---|---|---|---|---|---|---|---|---|
| A | SELA24AT0030 | €926.91 | RFQ | |||||
| A | SELA24AT0060 | - | RFQ | |||||
| A | SELA36AT0030 | €1,025.41 | RFQ |
Molded Case Circuit Breakers, Bjl Type
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I| Style | Model | MPN | Price | |
|---|---|---|---|---|
| A | BJL16015 | €995.21 | ||
| A | BJL16020 | €992.94 | ||
| A | BJL16030 | €995.21 | ||
| A | BJL16040 | €1,358.58 | ||
| A | BJL16060 | €961.38 | ||
| A | BJL16100 | €1,204.46 | ||
| B | BJL26015 | €2,064.46 | ||
| C | BJL26015LU | €3,640.67 | ||
| D | BJL26020 | €909.07 | ||
| D | BJL26030 | €2,104.95 | ||
| E | BJL26040 | €2,323.76 | ||
| D | BJL26060 | €1,865.10 | ||
| D | BJL26080 | €2,142.94 | ||
| C | BJL26125LU | €5,978.65 | ||
| F | BJL36015LU | €2,748.92 | ||
| F | BJL36020LU | €2,756.49 | ||
| G | BJL36025 | €2,597.27 | ||
| F | BJL36025LU | €2,748.92 | ||
| H | BJL36035 | €2,540.10 | ||
| F | BJL36035LU | €3,940.59 | ||
| F | BJL36040LU | €2,713.42 | ||
| I | BJL36045 | €2,608.03 | ||
| F | BJL36045LU | €3,628.68 | ||
| F | BJL36050LU | €4,348.97 | ||
| F | BJL36060LU | €3,628.68 |
Molded Case Circuit Breakers, Bja Type
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CMolded Case Circuit Breakers, Bdl Type
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CDE| Style | Model | MPN | Price | |
|---|---|---|---|---|
| A | BDL16025 | €513.57 | ||
| A | BDL16030 | €539.29 | ||
| A | BDL16040 | €514.15 | ||
| A | BDL16050 | €534.60 | ||
| A | BDL16060 | €513.40 | ||
| A | BDL16080 | €712.89 | ||
| A | BDL16100 | €641.63 | ||
| A | BDL16125 | €1,133.66 | ||
| B | BDL26015LU | €1,515.19 | ||
| B | BDL26020LU | €1,840.40 | ||
| B | BDL26025LU | €1,912.52 | ||
| B | BDL26030LU | €1,519.29 | ||
| C | BDL26035 | €875.41 | ||
| D | BDL26045 | €1,129.15 | ||
| B | BDL26050LU | €1,840.40 | ||
| B | BDL26070LU | €2,193.95 | ||
| D | BDL26110 | €1,695.81 | ||
| D | BDL26125 | €2,121.84 | ||
| E | BDL36015LU | €1,778.83 | ||
| E | BDL36020LU | €1,839.72 | ||
| E | BDL36025LU | €1,849.52 | ||
| E | BDL36030LU | €1,849.52 | ||
| E | BDL36035LU | €1,866.46 | ||
| E | BDL36040LU | €1,839.72 | ||
| E | BDL36045LU | €2,240.92 |
Molded Case Circuit Breakers, Bda Type
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CD| Style | Model | MPN | Price | |
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| A | BDA24015Y1 | €909.07 | ||
| A | BDA24020Y1 | €909.07 | ||
| A | BDA24025Y1 | €1,574.03 | ||
| A | BDA24030Y1 | €909.07 | ||
| A | BDA24035Y1 | €1,557.99 | ||
| A | BDA24040Y1 | €909.07 | ||
| A | BDA24045Y1 | €1,712.20 | ||
| A | BDA24050Y1 | €909.07 | ||
| A | BDA24060Y1 | €970.66 | ||
| A | BDA24070Y1 | €1,077.37 | ||
| A | BDA24080Y1 | €1,077.37 | ||
| A | BDA24100Y1 | €1,077.37 | ||
| A | BDA24125Y1 | €1,465.79 | ||
| B | BDA34025Y | €1,060.54 | ||
| B | BDA34035Y | €1,060.54 | ||
| B | BDA34045Y | €1,361.80 | ||
| C | BDA140201 | €606.04 | ||
| D | BDA160151 | €488.23 | ||
| D | BDA160201 | €488.23 | ||
| D | BDA160251 | €774.34 | ||
| D | BDA160301 | €488.23 | ||
| D | BDA160351 | €598.82 | ||
| D | BDA160501 | €728.98 | ||
| D | BDA160601 | €612.15 | ||
| D | BDA160701 | €1,219.57 |
Motor Circuit Protectors, 3 Pole
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ANavy And Marine Circuit Breakers
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H| Style | Model | Circuit Breaker Type | Voltage | Type | Number Of Poles | Price | |
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| A | 1230C83G04 | €71,740.59 | |||||
| B | 454D507G05 | €1,320.62 | |||||
| C | 1488D90G20 | €404,174.39 | |||||
| C | 1491D72G17 | €3,131.93 | |||||
| C | 1491D72G18 | €3,131.93 | |||||
| C | 313C085G13 | €24,983.58 | |||||
| D | 315C574G03 | - | RFQ | ||||
| D | 315C574G24 | €40,724.36 | |||||
| A | 1230C83G12 | €100,091.82 | |||||
| E | NQB-A103 | €9,406.43 | |||||
| F | 1244C56G25 | €7,428.92 | |||||
| B | 454D507G08 | €940.09 | |||||
| B | 454D507G01 | €930.79 | |||||
| B | 454D507G04 | €1,186.36 | |||||
| B | 454D507G10 | €999.81 | |||||
| C | 1483D84G43 | €80,247.15 | |||||
| C | 83E4846 | €51,848.35 | |||||
| G | 1483D82G10 | €102,364.19 | |||||
| C | 1491D72G19 | - | RFQ | ||||
| H | 1376D96G01 | - | RFQ | ||||
| D | 315C574G05 | €38,178.39 | |||||
| D | 315C574G22 | - | RFQ | ||||
| D | 315C574G18 | - | RFQ | ||||
| D | 315C574G20 | €40,724.36 | |||||
| D | 315C574G26 | €40,724.36 |
QUICKLAG Ground Fault Circuit Breakers: QBGF Series
Eaton Quicklag miniature circuit breakers are suitable for protection of sensitive electrical circuits in motor start controls and sub-main circuits. These units feature a thermal-magnetic trip unit with instantaneous and time-delayed current limiting functions and an integral over-centre toggle mechanism for visual indication of the tripped status. They have a plug-on mounting facility for reducing the installation and maintenance downtime. Choose from a wide range of these QBGF Series MCBs available in one and two pole variants on Raptor Supplies.
Eaton Quicklag miniature circuit breakers are suitable for protection of sensitive electrical circuits in motor start controls and sub-main circuits. These units feature a thermal-magnetic trip unit with instantaneous and time-delayed current limiting functions and an integral over-centre toggle mechanism for visual indication of the tripped status. They have a plug-on mounting facility for reducing the installation and maintenance downtime. Choose from a wide range of these QBGF Series MCBs available in one and two pole variants on Raptor Supplies.
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BJGMP Series Motor Protection Circuit Breakers, JG Frame
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D| Style | Model | Number Of Poles | Circuit Breaker Type | Voltage | Price | |
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| A | JGMPH100G | - | RFQ | |||
| A | JGMPH050G | €12,558.38 | ||||
| B | JGMPS050G | - | RFQ | |||
| A | JGMPH250G | €6,052.01 | ||||
| C | JGMPS160GA5 | €8,477.43 | ||||
| D | JGMPS250WA3D15Y2 | €9,411.30 | ||||
| A | JGMPH160G | €12,558.38 |
NZM Series Complete Molded Case Circuit Breakers
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E| Style | Model | Number Of Poles | Circuit Breaker Type | Voltage | Type | Price | |
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| A | NZMH2-A63-NA | €4,578.33 | |||||
| B | NZMB1-AF30-NA | €1,750.05 | |||||
| C | NZMH4-AEF900-NA | €39,086.38 | |||||
| C | NZMH4-AEF600-NA | €23,997.05 | |||||
| C | NZMH4-AEF700-NA | €30,100.50 | |||||
| C | NZMH4-VEF1200-NA | €52,856.02 | |||||
| C | NZMH4-VE1600 | €59,237.28 | |||||
| C | NZMH4-VEF1000-NA | €44,964.09 | |||||
| C | NZMH4-VEF600-NA | - | RFQ | ||||
| D | NZMN1-A125-NA | €7,122.96 | |||||
| C | NZMH4-AEF800-NA | €30,100.50 | |||||
| C | NZMH4-VEF700-NA | €34,615.15 | |||||
| C | NZMH4-VE800-NA | - | RFQ | ||||
| C | NZMH4-VEF900-NA | €44,964.09 | |||||
| D | NZMN1-A20-NA | €2,538.63 | |||||
| D | NZMN1-A100-NA | €4,406.48 | |||||
| D | NZMN1-A20 | €1,912.18 | |||||
| D | NZMN1-A100 | €2,803.65 | |||||
| E | NZMB2-A80-NA | €2,470.88 | |||||
| C | NZMH4-VE1200-NA | €52,856.02 | |||||
| D | NZMN1-A63-NA | €2,102.03 | |||||
| D | NZMN1-AF50-NA | €3,588.35 | |||||
| D | NZMN1-AF60-NA | €3,588.35 | |||||
| D | NZMN1-AF20-NA | €1,912.18 | |||||
| D | NZMN1-AF45-NA | €2,102.03 |
| Style | Model | MPN | Price | |
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| A | LDC3125T52W | - | RFQ | |
| A | LDC3125T52WPN | - | RFQ | |
| A | LDC3125T52WZG | - | RFQ | |
| A | LDC3125T52WZGP | - | RFQ | |
| A | LDC3300 | €37,968.98 | ||
| A | LDC3400 | €9,177.92 | ||
| A | LDC3400T52WPN | - | RFQ | |
| A | LDC3400T52WZG | - | RFQ | |
| A | LDC3400T52WZGP | - | RFQ | |
| A | LDC3450 | €37,968.98 | ||
| A | LDC3500 | €9,177.92 | ||
| A | LDC3500CVH09 | €43,186.94 | ||
| A | LDC3600 | €9,177.92 | ||
| A | LDC3600A06S02 | €34,140.12 | ||
| A | LDC3600CVH09 | €45,193.61 | ||
| A | LDC3600V | €43,154.82 | ||
| A | LDC3600VWH09U17 | €50,595.90 | ||
| A | LDC3600W | - | RFQ | |
| A | LDCB3300 | - | RFQ | |
| A | LDCB3350 | - | RFQ | |
| A | LDCB3400 | - | RFQ | |
| A | LDCB3450 | - | RFQ | |
| A | LDCB3500 | - | RFQ | |
| A | LDCB3600 | - | RFQ |
LD Series Electronic Molded Case Circuit Breakers, L Frame
Eaton LD Series electronic molded case circuit breakers are designed for providing precise and adjustable protection settings in commercial and industrial applications. They are available in an electronic LSIG / LS / LSIA trip unit to protect electrical systems and alert operators in the event of overload, short circuit and ground faults. These UL-listed circuit breakers have a molded case construction that provides insulation, protection and mechanical stability. They also feature an L-frame design and three-pole configuration that offers an interrupting capacity of 35kA at 480VAC.
Eaton LD Series electronic molded case circuit breakers are designed for providing precise and adjustable protection settings in commercial and industrial applications. They are available in an electronic LSIG / LS / LSIA trip unit to protect electrical systems and alert operators in the event of overload, short circuit and ground faults. These UL-listed circuit breakers have a molded case construction that provides insulation, protection and mechanical stability. They also feature an L-frame design and three-pole configuration that offers an interrupting capacity of 35kA at 480VAC.
A| Style | Model | MPN | Price | |
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| A | LD3125T56W | - | RFQ | |
| A | LD3125T56WPN | - | RFQ | |
| A | LD3125T56WZG | - | RFQ | |
| A | LD3125T56WZGP | - | RFQ | |
| A | LD3125T57W | - | RFQ | |
| A | LD3125T57WPN | - | RFQ | |
| A | LD3125T57WZG | - | RFQ | |
| A | LD3125T57WZGP | - | RFQ | |
| A | LD3125T76W | - | RFQ | |
| A | LD3125T77W | - | RFQ | |
| A | LD3125T106W | - | RFQ | |
| A | LD3250T52W | - | RFQ | |
| A | LD3250T52WPN | - | RFQ | |
| A | LD3250T52WZG | - | RFQ | |
| A | LD3250T52WZGP | - | RFQ | |
| A | LD3250T56W | - | RFQ | |
| A | LD3250T56WPN | - | RFQ | |
| A | LD3250T56WZG | - | RFQ | |
| A | LD3250T56WZGP | - | RFQ | |
| A | LD3250T57W | - | RFQ | |
| A | LD3250T57WPN | - | RFQ | |
| A | LD3250T57WZG | - | RFQ | |
| A | LD3250T57WZGP | - | RFQ | |
| A | LD3250T76W | - | RFQ | |
| A | LD3250T106W | - | RFQ |
C Series Complete Molded Case Circuit Breakers, L Frame
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D| Style | Model | MPN | Price | |
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| A | 83E9158 | €97,232.38 | ||
| B | 83E9611 | €27,842.91 | ||
| C | LG3450A12S01 | €11,257.58 | ||
| C | LG3450B05S01 | €10,697.09 | ||
| C | LG3450C04S01 | - | RFQ | |
| C | LG3450C10S01 | €11,681.91 | ||
| C | LG3450S02 | €10,128.59 | ||
| C | LG3450S03 | €9,832.35 | ||
| C | LG3450S48Y22X01 | - | RFQ | |
| C | LG3450WA12S03X01Y22 | €11,902.91 | ||
| C | LG3450WS01 | €9,960.46 | ||
| C | LG3450X01Y22 | €19,013.58 | ||
| C | LG3500A05S01 | €10,697.09 | ||
| C | LG3500A12S01 | - | RFQ | |
| C | LG3500A12S03 | €11,635.48 | ||
| C | LG3500A13S02 | €12,206.90 | ||
| C | LG3500B05S01 | €10,697.09 | ||
| C | LG3500C04S01 | €11,257.58 | ||
| C | LG3500C10S01 | €11,681.91 | ||
| C | LG3500S01 | €10,128.59 | ||
| C | LG3500S02 | - | RFQ | |
| C | LG3500S21 | €10,128.59 | ||
| C | LG3500WA12X04 | €9,848.36 | ||
| C | LG3500WS03Z01 | €10,617.03 | ||
| D | LG3600A05S01 | €10,697.09 |
Molded Case Circuit Breakers
Molded case circuit breakers are designed to prevent the flow of faulty power supplies into sensitive electrical equipment that may cause overloads and short circuits. With current ratings up to 1600A, these units are ideal for isolation applications in large PV systems. Raptor Supplies offers a wide range of these MCCBs from brands like ABB, Square D, Eaton, General Electric and Siemens. Square D circuit breakers come equipped with a thermal-magnetic trip unit which instantly opens under faulty currents and are capable of providing both time-delayed and instantaneous current limiting functions. These units feature an I-line type configuration at the ON end for facilitating bus connections in panelboards and lugs at the OFF end for cable connection. General Electric molded case circuit breakers feature a programmable electronic trip unit which accentuates the toggle when the current exceeds the predetermined value. These breakers come equipped with bolt-on type terminals for easy installation in reverse-feed applications. They are available in 2 and 3 pole options with a maximum voltage rating of 600VAC on Raptor Supplies.
Working Mechanism
Molded case circuit breaker's working mechanism includes following steps:
- In the normal state, molded case circuit breakers allow electrical current to flow through the circuit uninterrupted.
- When an overcurrent condition occurs, the MCCB's internal sensors detect the excess current flowing through the circuit.
- They have two main trip mechanisms: electromagnetic trip and thermal trip.
- The electromagnetic trip detects sudden, high-current surges, similar to short circuits, and quickly opens the circuit to cut power.
- The thermal trip reacts to prolonged overloads by heating up, causing the MCCB to trip and disconnect the circuit.
- Once the trip mechanism is activated, it triggers a mechanical release within the circuit breaker.
- Hence, the breaker's contacts move quickly to the open position.
- When the contacts are open, the MCCB interrupts the electrical flow, effectively cutting off power to the circuit.
- The circuit remains in this disconnected state until manually reset by the user.
Frequently Asked Questions
How does a molded case circuit breaker differ from a circuit breaker?
While both molded case circuit breakers and conventional circuit breakers serve the same primary purpose of protecting electrical circuits, MCCBs are a specific type of circuit breaker with a molded case for added durability and protection.
Can MCCBs be reset after tripping?
Once the fault or overload is resolved, you can reset the MCCB to restore power to the circuit.
What is the difference between an MCCB and a miniature circuit breaker (MCB)?
Molded case circuit breakers are designed for higher current ratings and are used in industrial settings with heavy machinery, while MCBs are smaller and designed for residential or light commercial applications with lower current ratings.
Can MCCBs be used in three-phase electrical systems?
Yes, MCCBs are commonly used in three-phase systems. Brands like WEG, Siemens and ABB come in various configurations to suit single-phase or three-phase applications.
How do I select the right MCCB for my specific application?
Selecting the right MCCB involves considering factors such as the system's voltage, current rating, environmental conditions and specific protection requirements.
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