Molded Case Circuit Breakers - Page 3 | Raptor Supplies Singapore

Molded Case Circuit Breakers

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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... Read More

SIEMENS -

HHLD Series Circuit Breakers, Bolt On

Siemens HHLD Series circuit breakers, with high interrupting capacity, are designed to protect the sensitive circuits from excessive current flows causing overloads or short circuits. These devices are calibrated at an ambient temperature of 40 degrees C and feature a thermal-magnetic trip to deliver long-time and instantaneous current limiting functions. They feature a bolt-on mounting design ensuring ease-of-installation and a secure wiring configuration. Choose from a wide variety of these circuit breakers available in current ratings ranging from 400 to 600A on Raptor Supplies.

StyleModelAmpsPrice (inc. GST)
AHHLD63B400400A-
RFQ
BHHLD63B500500A SGD 8236.37
CHHLD63B600600A SGD 8236.37
StyleModelAmps
ACND63B1001000A
RFQ
ACND63B1201200A
RFQ
SIEMENS -

Bolt-On Circuit Breakers: HHFD Series

Siemens HHFD Series circuit breakers are designed to protect industrial machinery and equipment from damages caused by short-circuit and overload occurrences. These UL-listed breakers come with a molded case to hold the current-carrying components, trip devices and other mechanisms within a compact space. The thermal-magnetic trip mechanism of these devices overrides mild current overloads but instantly responds to heavy fluctuations for user safety. They further come with a bolt-on mounting facility to offer compatibility with panelboards and switchboards. Choose from a wide range of these Siemens circuit breakers available in current ratings ranging from 110 to 250A, on Raptor Supplies.

StyleModelAmpsPrice (inc. GST)
AHHFD63B100110A SGD 4382.02
BHHFD63B125150A SGD 4382.02
CHHFD63B150175A SGD 4382.02
DHHFD63B175200A-
RFQ
EHHFD63B200225A SGD 4382.02
FHHFD63B225250A SGD 4382.02
GHHFD63B250250A SGD 4382.02
HHHFD63F250250A SGD 4136.81
SIEMENS -

HHED Series Circuit Breakers

Siemens HHED Series circuit breakers are used in electrical distribution systems and panel boards to protect against overloads and short circuits. These circuit breakers safeguard electrical equipment, appliances and wiring from damage caused by excessive currents. They can be operated at voltages up to 600V. These circuit breakers have thermal and magnetic trip units, providing both long-time and instantaneous protection functions. They feature feed-through connection configuration, allowing current to pass through the breaker. These circuit breakers are available in 2 & 3-pole configurations.

StyleModelAic RatingAmpsNumber Of PolesPrice (inc. GST)
AHHED63B015A16kAIC@600V15A3 SGD 2309.63
BHHED62B04065kAIC@480V40A2 SGD 1390.68
BHHED62B02065kAIC@480V20A2-
RFQ
CHHED63M04065kAIC@480V40A3 SGD 1889.95
DHHED63B12565kAIC@480V125A3-
RFQ
DHHED63B08065kAIC@480V80A3-
RFQ
EHHED63B05065kAIC@480V50A3 SGD 2309.63
FHHED63B03565kAIC@480V35A3-
RFQ
GHHED63B02565kAIC@480V25A3-
RFQ
BHHED62B09065kAIC@480V90A2-
RFQ
BHHED62B07065kAIC@480V70A2-
RFQ
BHHED62B05065kAIC@480V50A2 SGD 1390.68
BHHED62B03065kAIC@480V30A2 SGD 1390.68
BHHED62B02565kAIC@480V25A2 SGD 1390.68
HHHED62B01565kAIC@480V15A2 SGD 1390.68
BHHED62B06065kAIC@480V60A2 SGD 1390.68
IHHED63M05065kAIC@480V50A3-
RFQ
JHHED63M02065kAIC@480V20A3-
RFQ
DHHED63B11065kAIC@480V110A3-
RFQ
DHHED63B07065kAIC@480V70A3-
RFQ
EHHED63B04565kAIC@480V45A3 SGD 2309.63
KHHED63B03065kAIC@480V30A3 SGD 2309.63
LHHED63B02065kAIC@480V20A3 SGD 2155.73
MHHED62B12565kAIC@480V125A2-
RFQ
NHHED62B11065kAIC@480V110A2 SGD 1749.54
SIEMENS -

Bolt On Circuit Breakers, HFD / HFXD Series

Siemens circuit breakers, in HFD / HFXD frame, are designed to prevent damage to an electric circuit due to excessive current flow. These devices feature a 3-phase configuration with a thermal-magnetic trip facility to avoid tripping on mild overloads while instantaneously responding against severe power surges. They come in a bolt-on mounting design that ensures hassle-free installation and accommodates aluminium or copper wire connections in varied sizes. Choose from a wide range of these circuit breakers available in amperage ratings ranging from 70 to 250A on Raptor Supplies.

StyleModelAmpsPrice (inc. GST)
AHFD63B07070A SGD 3570.53
BHFD63B09090A-
RFQ
AHFD63B100100A SGD 3332.39
AHFD63B110110A-
RFQ
AHFD63B125125A SGD 3332.39
AHFD63B150150A SGD 3332.39
CHFD63B175175A SGD 3332.39
AHFD63B200200A SGD 3332.39
AHFD63B225225A SGD 3332.39
DHFXD63B100225A SGD 2865.64
EHFXD63B125225A SGD 3332.50
FHFXD63B225225A SGD 2865.64
AHFD63B250250A SGD 3494.80
FHFD63F250250A-
RFQ
SIEMENS -

HED Series Circuit Breakers, Thermal Magnetic Trip

Siemens HED Series circuit breakers interrupt current blow and protect electrical circuits against overloads and short-circuits, making them ideal for switchboards, lighting & panel boards and loadcentres. They feature a thermal magnetic trip unit providing instantaneous & time delayed current limiting protection and bolt-on mounting design to accommodate aluminium & copper wires. These circuit breakers allow ground fault protection against electrical shocks. HED Series circuit breakers are available in an amperage ratings of 15 to 125A on Raptor Supplies.

StyleModelAic RatingAmpsNumber Of PolesVoltagePrice (inc. GST)
AHED43B12542kAIC@480V125A3480V SGD 2116.70
BHED43B03542kAIC@480V35A3480V SGD 1502.45
CHED43B11042kAIC@480V110A3480V SGD 13970.01
DHED43B10042kAIC@480V100A3480V SGD 1507.54
EHED43B09042kAIC@480V90A3480V SGD 1507.54
DHED43B08042kAIC@480V80A3480V SGD 1507.54
DHED43B07042kAIC@480V70A3480V SGD 1507.54
AHED43B06042kAIC@480V60A3480V SGD 1439.32
FHED43B05042kAIC@480V50A3480V SGD 1439.32
DHED43B04542kAIC@480V45A3480V SGD 6188.21
GHED43B04042kAIC@480V40A3480V SGD 1439.32
HHED43B03042kAIC@480V30A3480V SGD 1439.32
HHED43B02542kAIC@480V25A3480V SGD 6101.07
IHED43B02042kAIC@480V20A3480V SGD 1439.32
DHED43B01542kAIC@480V15A3480V SGD 1439.32
JHED41B05065kAIC@277v50A1277V SGD 571.01
KHED42B12565kAIC@277v125A2480V SGD 1749.54
KHED42B11065kAIC@277v110A2480V SGD 1603.28
LHED42B10065kAIC@277v100A2480V SGD 5481.71
LHED42B01565kAIC@277v15A2480V-
RFQ
MHED41B10065kAIC@277v100A1277V SGD 717.05
MHED41B06065kAIC@277v60A1277V SGD 571.01
NHED41B04565kAIC@277v45A1277V SGD 597.10
SIEMENS -

Molded Case Circuit Breakers, Thermal MagneticTrip

Siemens ED4 Series circuit breakers protect electrical devices against overcurrent and short circuit conditions. They feature a thermal magnetic trip for providing both instantaneous & long time current limiting protection, bolt-on mounting facility for ease of installation and load side lugs accommodating copper or aluminium wires. These 2 / 3 pole units deliver interrupting capacities of 18kA@240V / 18kA@480V, respectively. These ED-frame circuit breakers are available in current ratings ranging between 20A & 125A on Raptor Supplies.

StyleModelAic RatingAmpsNumber Of PolesPrice (inc. GST)
AED42S100A18kAIC@240V100A2 SGD 450.27
BED42S125A18kAIC@240V125A2-
RFQ
CED42B11018kAIC@480V110A2 SGD 1010.58
DED43B05018kAIC@480V50A3 SGD 1263.31
EED43B12518kAIC@480V125A3 SGD 1749.54
FED43B10018kAIC@480V100A3 SGD 1326.77
GED43B09018kAIC@480V90A3 SGD 1326.77
FED43B08018kAIC@480V80A3 SGD 1326.77
FED43B07018kAIC@480V70A3 SGD 3756.63
HED43B06018kAIC@480V60A3 SGD 1263.31
FED43B04018kAIC@480V40A3 SGD 1200.85
IED43B04518kAIC@480V45A3 SGD 1263.31
JED42B12518kAIC@480V125A2 SGD 1831.80
FED43B03518kAIC@480V35A3 SGD 1263.31
KED43B03018kAIC@480V30A3 SGD 1200.85
LED43B02518kAIC@480V25A3 SGD 1263.31
IED43B02018kAIC@480V20A3 SGD 1200.85
BED42M07018kAIC@480V70A2-
RFQ
MED43S100A18kAIC@480V100A3 SGD 1124.24
SIEMENS -

Bolt On Circuit Breaker: ED2 Series

StyleModelAic RatingAmpsNumber Of PolesVoltagePrice (inc. GST)
AED21B03010kAIC@120V30A1120V SGD 228.61
BED21B04010kAIC@120V40A1120V SGD 237.57
CED21B04510kAIC@120V45A1120V SGD 237.57
AED21B05010kAIC@120V50A1120V SGD 237.57
AED21B06010kAIC@120V60A1120V SGD 237.57
AED21B10010kAIC@120V100A1120V SGD 289.42
BED21B03510kAIC@120V35A1120V SGD 237.57
DED23B04010kAIC@240V40A3240V SGD 721.03
DED23B10010kAIC@240V100A3240V SGD 972.33
EED23B09010kAIC@240V90A3240V SGD 972.33
FED23B08010kAIC@240V80A3240V SGD 972.33
GED23B07010kAIC@240V70A3240V SGD 972.33
DED23B06010kAIC@240V60A3240V SGD 721.03
HED23B05010kAIC@240V50A3240V SGD 721.03
DED23B04510kAIC@240V45A3240V SGD 2338.95
DED23B02010kAIC@240V20A3240V SGD 721.03
DED23B03510kAIC@240V35A3240V SGD 767.80
DED23B03010kAIC@240V30A3240V SGD 721.03
DED23B02510kAIC@240V25A3240V SGD 767.80
DED23B01510kAIC@240V15A3240V SGD 721.03
IED22S100A10kAIC@240V100A2240V SGD 348.95
JED22B10010kAIC@240V100A2240V SGD 865.75
KED22B09010kAIC@240V90A2240V SGD 865.75
LED22B01510kAIC@240V15A2240V SGD 544.25
MED23S100A10kAIC@240V100A3240V-
RFQ
GENERAL ELECTRIC -

Circuit Breaker: TEL Series

StyleModelAmpsPrice (inc. GST)
ATEL136015WL15A-
RFQ
ATEL136020WL20A-
RFQ
BTEL136025WL25A-
RFQ
ATEL136030WL30A-
RFQ
ATEL136040WL40A-
RFQ
ATEL136060WL60A-
RFQ
ATEL136070WL70A SGD 2858.10
RFQ
ATEL136080WL80A-
RFQ
ATEL136090WL90A-
RFQ
ATEL136100WL100A-
RFQ
ATEL136150WL150A-
RFQ
GENERAL ELECTRIC -

TEC Series Circuit Breakers, B-Curve

General Electric TEC Series molded case circuit breakers are suitable for use with control panels, switchboards and motor control centers for protection against current overloads and short-circuit conditions. These units feature a front-adjustable magnetic trip providing instantaneous current limiting function, thus signalling the actuator to open the contacts and interrupt the current supply. The B-curve three-pole breakers are capable of providing a magnetic trip setting rated 3 to 5 times the amperage value of the electrical device. These IEC protectors are integrated with line- and load-side lug terminals for ease-of-installation and secure wiring. Choose from a wide range of these products available in current ratings ranging from 3 to 100A on Raptor Supplies.

StyleModelAmpsPrice (inc. GST)
ATEC360033A SGD 2333.51
RFQ
ATEC360077A-
RFQ
ATEC3601515A SGD 3879.76
RFQ
ATEC3603030A-
RFQ
ATEC36100100A SGD 9319.06
RFQ
ATEC36125100A-
RFQ
SIEMENS -

Bolt On Circuit Breaker: LMXD Series

StyleModelAmpsPrice (inc. GST)
ALMXD63B500500A-
RFQ
ALMXD63B600600A-
RFQ
BLMXD63B700700A-
RFQ
CLMXD63B800800A SGD 6589.21
DLMXD63S800A800A SGD 6279.73
EATON -

CC Series Molded Case Circuit Breakers

Eaton CC Series circuit breakers provide overcurrent protection by limiting current flow. These circuit breakers come with a thermal-magnetic trip system that offers both long-time and instantaneous functionalities for optimal protection. The CC frame design provides an interrupting rating of 10kA @ 240V and current up to 225A for reverse feed applications. They feature bolt-on mounting and load side lug terminals for smooth installation. These molded case circuit breakers are available in 2 & 3 pole options on Raptor Supplies.

StyleModelAmps
ACC2100X100
RFQ
BCC2100100A
RFQ
BCC2125125A
RFQ
ACC2150150
RFQ
BCC2200200A
RFQ
BCC2225225A
RFQ
SQUARE D -

Molded Case Circuit Breakers, LA Frame Type

Square D LA Series circuit breakers are primarily designed for automatically opening a circuit under current overloads and short-circuit conditions. These units feature a fixed thermal-magnetic trip, with interrupting ratings of 42kA @ 120VAC, 30kA @ 480VAC and 22kA @ 600 VAC, providing instantaneous and time-delayed functions. The molded case of these C-curve protectors hold the current-carrying components, trip devices and other mechanisms within a very small space. Choose from a wide range of these circuit breakers available in 2- and 3-pole configurations on Raptor Supplies.

StyleModelAmpsNumber Of PolesPhasePrice (inc. GST)
ALA3612512533 SGD 8780.54
ALA3615015033 SGD 10425.19
ALA3617517533 SGD 17765.10
BLA3620020033 SGD 8780.54
CLA3622522533 SGD 8780.54
DLA36250-10212503--
RFQ
ELA3625025033 SGD 8780.54
ALA26300AC30021 SGD 8171.70
FLA3630030033 SGD 8780.54
DLAF363503503--
RFQ
DLAB363503503--
RFQ
GLA3640040033 SGD 8780.54
ALA26400AC40021 SGD 8171.70
DLA36400-10214003--
RFQ
DLA36400MT4003--
RFQ
SQUARE D -

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.

StyleModelAmpsVoltagePrice (inc. GST)
ALHL36125125A600V SGD 7702.94
BLHL36150150A600V SGD 7702.94
CLHL36175175A600V-
RFQ
DLHL36200200A600V-
RFQ
ELHL36225225A600V-
RFQ
FLHL36250250- SGD 8718.40
GLHL36300-1021300600 SGD 7694.53
RFQ
HLHL36300300A600V SGD 7702.94
FLHL36350350- SGD 7702.94
GLHL36400-1021400600 SGD 7657.83
GLHL36400MB400600 SGD 7702.94
ILHL36000M400A600V SGD 7702.94
JLHL36400400A600V-
RFQ
SQUARE D -

MGL Series Molded Case Circuit Breakers

Square D MGL Series circuit breakers protect industrial machinery and equipment from damages caused by short-circuit and overload occurrences. They feature a programmable electronic trip for long-time, short-time & instantaneous tripping and a solid-state protection system for electronically controlling the current flow. They are equipped with line and load side lug terminals to ensure ease-of-wiring and maximum conductivity. MGL Series circuit breakers are available in M frame size on Raptor Supplies.

StyleModelAmpsPrice (inc. GST)
AMGL36300300 SGD 12527.65
AMGL36350350 SGD 15383.86
AMGL36400400 SGD 12527.65
AMGL36450450 SGD 12527.65
AMGL36500500 SGD 12527.65
AMGL36600600 SGD 12527.65
AMGL36700700 SGD 13386.68
AMGL36800800 SGD 13386.68
SQUARE D -

MJA Series Molded Case Circuit Breakers

Square D MJA Series moulded case circuit breakers are used in commercial facilities, industrial plants, data centres and institutional buildings for reliable protection against overcurrents and short circuits in electrical systems. They have a -pole, 3-phase configuration with bolt-on terminal design for enhanced safety and secure connection. These standard circuit breakers feature an electronic trip for LSI (Long-time, Short-time and Instantaneous) trip functions. They offer current ratings ranging from 300A to 800A. These breaker units are further equipped with line and load side lug terminals to accommodate copper / aluminium wires of sizes ranging from 500 Kcmil to 3 AWG.

StyleModelAmpsPrice (inc. GST)
AMJA36300300 SGD 13864.40
AMJA36350350 SGD 18151.34
AMJA36400400 SGD 13864.40
AMJA36450450 SGD 14588.66
AMJA36500500 SGD 13864.40
AMJA36600600 SGD 13864.40
BMJA36700700 SGD 14588.66
AMJA36800800 SGD 14588.66
SQUARE D -

MJL Series Molded Case Circuit Breakers

Square D MJL Series circuit breakers are designed to protect sensitive circuits from excessive current flows causing overloads or short circuits. These circuit breakers feature a programmable electronic trip for short-time, long-time & instantaneous tripping and a solid-state protection system for electronically controlling the current flow & providing advanced safety for appliances. These breakers are equipped with line and load side lug terminals to accommodate wires (copper / aluminium) of sizes ranging between 500 kcmil & 3 AWG. These circuit breakers provide current ratings up to 800A and deliver interrupt capacity of 100kA at 240VAC, 65kA at 480VAC and 25kA at 600VAC.

StyleModelAmpsPrice (inc. GST)
AMJL36300300 SGD 13864.40
AMJL36350350 SGD 13864.40
AMJL36400400 SGD 13864.40
AMJL36450450 SGD 13864.40
AMJL36500500 SGD 13128.64
AMJL36600600 SGD 13128.64
AMJL36700700 SGD 26387.29
AMJL36800800 SGD 13864.40
BMJL36800AA800 SGD 18317.09
RFQ
SQUARE D -

PGL Series, Circuit Breaker

StyleModelAmpsVoltagePrice (inc. GST)
APGL36060600A600V-
RFQ
BPGL36080U33A800600-
RFQ
APGL36080800A600V-
RFQ
CPGL361001000- SGD 23121.57
CPGL36100U41A1000A600V-
RFQ
CPGL36100U44A1000A600V SGD 28686.46
CPGL361201200- SGD 23121.57
CPGL36120U41A1200A600V SGD 23121.57
CPGL36120U44A1200A600V SGD 28686.46
SQUARE D -

PJL Series Molded Case Circuit Breakers

Square D PJL Series circuit breakers are used for protecting electrical equipment from current overload and short-circuit conditions. These circuit breakers feature a programmable electronic trip for short-time, long-time & instantaneous tripping and are equipped with line & load side lug terminals to accommodate wires (copper / aluminium) of sizes ranging between 500 kcmil & 3 AWG. These UL listed circuit breakers provide current ratings up to 1200A and deliver interrupt capacity of 100kA at 240VAC, 65kA at 480VAC and 25kA at 600VAC.

StyleModelAmpsVoltagePrice (inc. GST)
APJL36080CU31A800600-
RFQ
APJL36080U31A800600-
RFQ
APJL36100CU41A1000600-
RFQ
BPJL36100AA1000600-
RFQ
APJL36100U41A1000600 SGD 28608.08
CPJL361001000- SGD 23121.57
CPJL36100U44A1000A600V SGD 18939.27
BPJL36000S121200600-
RFQ
APJL36120CU41A1200600-
RFQ
DPJL36120U41A1200A600V SGD 28608.08
CPJL36120U44A1200A600V SGD 31842.09
SQUARE D -

Q4 Series Circuit Breakers

Square D Q4 Series circuit breakers protect sensitive circuits from excessive current flows causing overloads or short circuits. These circuit breakers feature an over-centre toggle mechanism to provide quick make and break operation with positive handle indication. The thermal-magnetic trip elements are calibrated at an ambient temperature of 40 degrees Celsius to provide uniform tripping. They come with a push-to-trip button that enables the user to manually trip the circuit breaker and perform maintenance checks. Raptor Supplies offers a huge variety of these Q4 Series circuit breakers that can be mounted in any position.

StyleModelAmpsPrice (inc. GST)
AQ4L3250250 SGD 3475.78
BQ432250250A SGD 5503.18
CQ4L3300300 SGD 5779.46
DQ432300300A SGD 5503.18
EQ4L3350350 SGD 7302.61
BQ432350350A SGD 5503.18
FQ4L3400400 SGD 5779.46
GQ432400400A-
RFQ
SQUARE D -

QBL Series Circuit Breakers

Square D QBL Series circuit breakers feature a PowerPact Q frame for overcurrent protection and switching On AC systems. These circuit breakers feature a thermal-magnetic trip mechanism that overrides mild currents while instantly responding to heavy fluctuations. They are built in accordance with UL Standard 489 and NEMA Standard AB-1-1999. These circuit breakers feature an over-centre toggle mechanism with a trip-free action to provide quick make and break operation. The integral push-to-trip button in the cover enables the user to manually trip the circuit breaker. Raptor Supplies offers a huge variety of these circuit breakers in 2 and 3 pole configurations.

StyleModelAmpsDepthNumber Of PolesPhaseVoltageWidthPrice (inc. GST)
AQBL3207070-3-240- SGD 1603.50
BQBL2207070A-2-240V- SGD 778.19
BQBL2208080A-2-240V- SGD 677.80
CQBL3208080A-3-240V- SGD 1603.50
BQBL2209090A-2-240V- SGD 778.19
CQBL3209090A-3-240V- SGD 1603.50
AQBL32100100-3-240- SGD 1603.50
BQBL22100100A-2-240V- SGD 626.95
CQBL32110110A-3-240V- SGD 1603.50
BQBL22110110A-2-240V- SGD 860.11
CQBL321251253.93"33-4.5" SGD 1540.81
BQBL221251253.9"21-3" SGD 677.80
BQBL221501503.9"21-3" SGD 677.80
CQBL321501503.93"33-4.5" SGD 1540.81
CQBL321751753.93"33-4.5" SGD 1540.81
BQBL221751753.9"21-3" SGD 626.95
CQBL322002003.93"33-4.5" SGD 1540.81
BQBL222002003.9"21-3" SGD 626.95
CQBL322252253.93"33-4.5" SGD 1540.81
BQBL222252253.9"21-3" SGD 677.80
DQBL22250250-2-240- SGD 959.50
CQBL32250250A-3-240V- SGD 2124.78
1234...54

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.

Features

General Electric Bolt-On Circuit Breakers:

  • These General Electric TEYH Series MCCBs have a thermal-magnetic, non-interchangeable trip unit to protect from severe power surges while avoiding tripping on mild overloads.
  • They also have a bolt-on mounting facility for convenience and compatibility with lug-lug / unit-mount applications.
  • These UL-listed breakers are available in single, two and three-pole configurations and accommodate universal 10 to 4 AWG size wires.

Square D PowerPacT Circuit Breakers :

  • These Square D MCCBs have a new front-facing and semi-transparent cover for easy access to accessories.
  • They have current ratings ranging from 15 to 125A and offer a maximum breaking capacity of 65kA at 480VAC.
  • These RoHS and REACH-compliant breakers feature dual-break rotating contacts that reduce peak current during a short circuit fault.

Eaton HKD Series Circuit Breakers :

  • Eaton HKD Series circuit breakers protect against overload and short circuit conditions in 480Y / 277V (three-phase, four-wire) distribution panels.
  • They have 2-pole construction and can serve two separate circuits or a complete single circuit when short-circuited.

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.