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      AlibabaElectrical Equipment & SuppliesLow Voltage ProductsMoulded Case Circuit BreakersWholesale 300a 400a
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      300a 400a

      (5801 products available)

      DC Switching Variable High Current Power Supply 100A 200A 250A 300A 400A 500A 1000A 1500A 2000A For 5V 12V 15V 30V 48V 100V 300V

      DC Switching Variable High Current Power Supply 100A 200A 250A 300A 400A 500A 1000A 1500A 2000A For 5V 12V 15V 30V 48V 100V 300V

      $4,000.00 - $20,000.00
      Min Order: 5 pieces
      CN
      9 yrs
      4.8
      /5
      ·
      5 reviews
      ·
      "good service"
      Contact Supplier
      Top sponsor listing
      NH NT RT16 63A 100A 125A 160A 200A 250A 300A 400A 500A 630A HRC Fuse Link And Fuse Base

      NH NT RT16 63A 100A 125A 160A 200A 250A 300A 400A 500A 630A HRC Fuse Link And Fuse Base

      $18.71 - $18.73
      Min Order: 40 pieces
      CN
      1 yrs
      0.0
      /5
      ·
      0 reviews
      ·
      Contact Supplier
      ad
      Best Selling Type CM1 Molded Case Circuit Breaker 1P 2P 4P 3 Phase Mccb 400a 300a 50ka Circuit Breaker

      Best Selling Type CM1 Molded Case Circuit Breaker 1P 2P 4P 3 Phase Mccb 400a 300a 50ka Circuit Breaker

      $7.00 - $48.00
      Min Order: 5 pieces
      CN
      1 yrs
      5.0
      /5
      ·
      6 reviews
      ·
      Contact Supplier
      ad
      NH Fuse 500Vdc/690Vdc 160A/200A 250A/300A/400A/500A/630A CE Certificate

      NH Fuse 500Vdc/690Vdc 160A/200A 250A/300A/400A/500A/630A CE Certificate

      $0.50 - $9.00
      Min Order: 500 pieces
      CN
      19 yrsverify
      4.7
      /5
      ·
      3 reviews
      ·
      "fast shipping"
      Contact Supplier
      ad
      CQC ISO CMC 2000times Power Operation 400V 800V 42kA 65kA AC225A 250A 315A 350A 400A 4poles MCCB Molded Circuit Breaker

      CQC ISO CMC 2000times Power Operation 400V 800V 42kA 65kA AC225A 250A 315A 350A 400A 4poles MCCB Molded Circuit Breaker

      $9.00 - $90.00
      Min Order: 50 pieces
      CN
      3 yrs
      0.0
      /5
      ·
      0 reviews
      ·
      Contact Supplier
      ad
      Split Core Current Transformer Factory Customized Ratio Cable AC CT 100A 200A 300A 400A 500A 600A 100mA 0.1A 0~750A OPCT35AL

      Split Core Current Transformer Factory Customized Ratio Cable AC CT 100A 200A 300A 400A 500A 600A 100mA 0.1A 0~750A OPCT35AL

      Ready to Ship
      $9.20 - $11.00
      Min Order: 3 pieces
      Shipping per piece: $8.74
      CN
      4 yrsverify
      4.9
      /5
      ·
      17 reviews
      ·
      "Quick shipment"
      Contact Supplier
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      120V 150V 200V 500V 100A 200A 300A 400A adjustable switching ac dc power supply

      120V 150V 200V 500V 100A 200A 300A 400A adjustable switching ac dc power supply

      $480.00 - $561.00
      Min Order: 1 set
      Output Power: >500W
      CN
      9 yrs
      0.0
      /5
      ·
      0 reviews
      ·
      Contact Supplier
      Meta-MEC ABE Series Economical Plastic Case Circuit Breaker 3P ABE403b 250A 300A 350A 400A

      Meta-MEC ABE Series Economical Plastic Case Circuit Breaker 3P ABE403b 250A 300A 350A 400A

      Ready to Ship
      $116.30 - $121.00
      Min Order: 1 piece
      Shipping per piece: $66.84
      CN
      10 yrsverify
      4.9
      /5
      ·
      33 reviews
      ·
      "good service"
      Contact Supplier
      GMC-150A GMC-180A GMC-300A GMC-400A 100A 150A 180A 300A 400A 110V/240V AC/DC Contactor coils

      GMC-150A GMC-180A GMC-300A GMC-400A 100A 150A 180A 300A 400A 110V/240V AC/DC Contactor coils

      $16.50 - $19.00
      Min Order: 1 piece
      CN
      3 yrs
      4.9
      /5
      ·
      26 reviews
      ·
      "good delivery"
      Contact Supplier
      Professional solar pv mccb breaker 1000v 500v 220v dc one pole 2pole dc 125 a 250a 300a 400a

      Professional solar pv mccb breaker 1000v 500v 220v dc one pole 2pole dc 125 a 250a 300a 400a

      $6.99 - $12.95
      Min Order: 5 pieces
      CN
      1 yrs
      5.0
      /5
      ·
      6 reviews
      ·
      Contact Supplier
      ZOII Industry Electrical Fixed Air Switch MCCB Moulded Case Circuit Breaker AC400V 3P 100A 200A 300A 400A

      ZOII Industry Electrical Fixed Air Switch MCCB Moulded Case Circuit Breaker AC400V 3P 100A 200A 300A 400A

      $6.00 - $8.00
      Min Order: 200 pieces
      CN
      3 yrs
      4.9
      /5
      ·
      15 reviews
      ·
      "timely delivery"
      Contact Supplier
      Air switch Power indicator relay circuit breaker AC contactor NV400-SW 3P 250A 300A 400A

      Air switch Power indicator relay circuit breaker AC contactor NV400-SW 3P 250A 300A 400A

      $10.00
      Min Order: 5 pieces
      CN
      1 yrs
      5.0
      /5
      ·
      1 reviews
      ·
      "good service"
      Contact Supplier
      Original M-itsubishi Low voltage distribution products NV400-SW 4P 250A 300A 350A 400A

      Original M-itsubishi Low voltage distribution products NV400-SW 4P 250A 300A 350A 400A

      $5.00 - $200.00
      Min Order: 5 pieces
      CN
      1 yrs
      0.0
      /5
      ·
      0 reviews
      ·
      Contact Supplier
      Duruble1000v 3p solar pv dc molded case circuit breaker MCCB 200a 300a 250a 350a 400a with fast delivery

      Duruble1000v 3p solar pv dc molded case circuit breaker MCCB 200a 300a 250a 350a 400a with fast delivery

      $73.40 - $73.70
      Min Order: 200 pieces
      CN
      2 yrsverify
      5.0
      /5
      ·
      3 reviews
      ·
      "fast delivery"
      Contact Supplier
      WEMAXPOWER Switching Mode 12V 500A&15V 400A&20V 300A&24V 250A&25V 240A & 30V 200A&40V150A&48V125A 6000W Variable DC Power Supply

      WEMAXPOWER Switching Mode 12V 500A&15V 400A&20V 300A&24V 250A&25V 240A & 30V 200A&40V150A&48V125A 6000W Variable DC Power Supply

      Ready to Ship
      $1,200.00 - $1,250.00
      Min Order: 1 unit
      Shipping per piece: $287.59
      CN
      6 yrs
      4.9
      /5
      ·
      110 reviews
      ·
      "helpful customer service"
      Contact Supplier
      MOREDAY Mccb Molded Case Breaker With Enclosure Types 2 Pole 3p Dc 1000v 1500v 250a 320a 400a

      MOREDAY Mccb Molded Case Breaker With Enclosure Types 2 Pole 3p Dc 1000v 1500v 250a 320a 400a

      $28.28 - $35.68
      Min Order: 5 pieces
      CN
      5 yrsverify
      4.9
      /5
      ·
      31 reviews
      ·
      "good delivery"
      Contact Supplier
      Electric Schneider-replacement 3 phase tesys f series contactor 630a 1000V 400a 300a contactor

      Electric Schneider-replacement 3 phase tesys f series contactor 630a 1000V 400a 300a contactor

      $19.00 - $55.00
      Min Order: 50 pieces
      CN
      13 yrsverify
      4.9
      /5
      ·
      33 reviews
      ·
      "good supplier"
      Contact Supplier
      ABS403 250A 300A 350A 400A MCCB/Moulded case circuit breaker

      ABS403 250A 300A 350A 400A MCCB/Moulded case circuit breaker

      $3.00 - $15.00
      Min Order: 5 pieces
      CN
      14 yrsverify
      4.9
      /5
      ·
      43 reviews
      ·
      "GREAT SERVICE"
      Contact Supplier
      mccb under voltage trip 400A 250A AC Molded Case Circuit Breakers 800V 1000V

      mccb under voltage trip 400A 250A AC Molded Case Circuit Breakers 800V 1000V

      $97.00 - $102.00
      Min Order: 50 pieces
      CN
      5 yrsverify
      4.7
      /5
      ·
      23 reviews
      ·
      "Great service"
      Contact Supplier
      SeanRo china mccb breakers electric circuit breaker 2 3 pole with CE certification mccb 300a

      SeanRo china mccb breakers electric circuit breaker 2 3 pole with CE certification mccb 300a

      $25.00 - $100.00
      Min Order: 10 sets
      CN
      5 yrsverify
      4.7
      /5
      ·
      29 reviews
      ·
      "Great service"
      Contact Supplier
      Long life-time NSX630 4p MCCB 250A 300A 320A 350A 400A 500A 630A moulded case circuit breaker

      Long life-time NSX630 4p MCCB 250A 300A 320A 350A 400A 500A 630A moulded case circuit breaker

      $160.00 - $186.67
      Min Order: 5 pieces
      CN
      15 yrsverify
      4.9
      /5
      ·
      7 reviews
      ·
      "responsive supplier"
      Contact Supplier
      High Voltage DC Contactors 12-24V Coil 200A 250A 300A 400A 500A Direct Current Relay For For Charging Piles

      High Voltage DC Contactors 12-24V Coil 200A 250A 300A 400A 500A Direct Current Relay For For Charging Piles

      $16.99 - $89.99
      Min Order: 5 pieces
      CN
      1 yrs
      4.7
      /5
      ·
      19 reviews
      ·
      "Excellent service"
      Contact Supplier
      50A 100A 200A 250A 300A 400A 500A Electric vehicle EV Charger Relay 800V 900V 1000V DC Charging HV High Voltage DC Contactor

      50A 100A 200A 250A 300A 400A 500A Electric vehicle EV Charger Relay 800V 900V 1000V DC Charging HV High Voltage DC Contactor

      $10.00 - $50.00
      Min Order: 20 pieces
      CN
      10 yrs
      4.8
      /5
      ·
      18 reviews
      ·
      "timely delivery"
      Contact Supplier
      CHINT 2P 3p 4 pole 125A 180A 200A 225A 300A 320A 400A 500A 630A 800A ac mccb circuit breaker

      CHINT 2P 3p 4 pole 125A 180A 200A 225A 300A 320A 400A 500A 630A 800A ac mccb circuit breaker

      $12.00 - $140.00
      Min Order: 3 sets
      CN
      1 yrs
      5.0
      /5
      ·
      3 reviews
      ·
      "professional supplier"
      Contact Supplier
      High Quality High Voltage Magnetic 50a 100a 200a 300a 400a 1000v Relay Dc Contactor

      High Quality High Voltage Magnetic 50a 100a 200a 300a 400a 1000v Relay Dc Contactor

      $15.00 - $26.00
      Min Order: 1 piece
      CN
      8 yrs
      4.5
      /5
      ·
      25 reviews
      ·
      "Good service"
      Contact Supplier
      Hot Sale DELIXI CDM3 250A 300A 400A 3P 4P electrical mccb moulded case circuit breaker

      Hot Sale DELIXI CDM3 250A 300A 400A 3P 4P electrical mccb moulded case circuit breaker

      $28.90 - $45.00
      Min Order: 1 piece
      CN
      11 yrsverify
      4.9
      /5
      ·
      11 reviews
      ·
      "Fast shipment"
      Contact Supplier
      USFULL DC 300A MCCB Battery 2P 4P 500V 1000V 125A 150A 200A 225A 400A 630A DC Moulded Case Circuit Breaker DC MCCB 250A

      USFULL DC 300A MCCB Battery 2P 4P 500V 1000V 125A 150A 200A 225A 400A 630A DC Moulded Case Circuit Breaker DC MCCB 250A

      $10.00 - $100.00
      Min Order: 5 pieces
      CN
      20 yrsverify
      4.9
      /5
      ·
      16 reviews
      ·
      "fast delivery"
      Contact Supplier
      Adjustable dc power supply/variable dc power supply 30V 50V 60V 100V 120V 200V 300V 100A 200A 300A 400A 500A

      Adjustable dc power supply/variable dc power supply 30V 50V 60V 100V 120V 200V 300V 100A 200A 300A 400A 500A

      $199.00 - $215.00
      Min Order: 5 pieces
      Output Voltage: 36V
      CN
      2 yrsverify
      5.0
      /5
      ·
      3 reviews
      ·
      "Great service"
      Contact Supplier
      CSQ 1600A Dc Mccb Dc Circuit Breaker For Solar System Breaker 1000V Shunt Trip 150A 200A 300A 400A 600A Pv Three Poles

      CSQ 1600A Dc Mccb Dc Circuit Breaker For Solar System Breaker 1000V Shunt Trip 150A 200A 300A 400A 600A Pv Three Poles

      $9.00 - $18.00
      Min Order: 5 pieces
      CN
      12 yrsverify
      4.8
      /5
      ·
      36 reviews
      ·
      "fast delivery"
      Contact Supplier
      CHINT 380v MCCB 300A 400A 500A 630A 800A MCCB New Type Circuit Breaker Good Quality Trois Phases Disjoncteur MCB CHINT

      CHINT 380v MCCB 300A 400A 500A 630A 800A MCCB New Type Circuit Breaker Good Quality Trois Phases Disjoncteur MCB CHINT

      $13.99 - $49.99
      Min Order: 10 pieces
      CN
      4 yrsverify
      4.9
      /5
      ·
      21 reviews
      ·
      "Good service"
      Contact Supplier
      Automotive Relay High Voltage DC Contactor 800V HV EV 20A 50A 60A 100A 150A 200A 250A 300A 350A 400A 500A

      Automotive Relay High Voltage DC Contactor 800V HV EV 20A 50A 60A 100A 150A 200A 250A 300A 350A 400A 500A

      $33.00 - $40.00
      Min Order: 5 pieces
      CN
      6 yrs
      4.8
      /5
      ·
      28 reviews
      ·
      "On time shipping"
      Contact Supplier
      DC mccb 100A 200A 300A 400A 500A circuit breaker EV car 60V 500V 1P 2P 3P

      DC mccb 100A 200A 300A 400A 500A circuit breaker EV car 60V 500V 1P 2P 3P

      $10.00 - $100.00
      Min Order: 5 pieces
      CN
      4 yrs
      4.7
      /5
      ·
      8 reviews
      ·
      "good delivery"
      Contact Supplier
      300A DC Circuit Break Relay for Electric Vehicles 1000Vdc

      300A DC Circuit Break Relay for Electric Vehicles 1000Vdc

      Ready to Ship
      $32.00 - $38.00
      Min Order: 10 pieces
      Shipping per piece: $7.30
      CN
      7 yrs
      5.0
      /5
      ·
      4 reviews
      ·
      "good service"
      Contact Supplier
      ac dc power supply 30V 50V 60V 100V 120V 200V 300V 100A 200A 300A 400A 500A

      ac dc power supply 30V 50V 60V 100V 120V 200V 300V 100A 200A 300A 400A 500A

      $150.00 - $2,000.00
      Min Order: 1 set
      CN
      16 yrsverify
      4.9
      /5
      ·
      43 reviews
      ·
      "good service"
      Contact Supplier
      USFULL 4 pole 300A 350A 400A Solar PV Molded Case Circuit Breakers DC1000V DC MCCB IEC CE Certificate

      USFULL 4 pole 300A 350A 400A Solar PV Molded Case Circuit Breakers DC1000V DC MCCB IEC CE Certificate

      $69.10 - $74.58
      Min Order: 4 pieces
      CN
      11 yrsverify
      5.0
      /5
      ·
      3 reviews
      ·
      "Timely dispatch"
      Contact Supplier
      100A 200A 300A 400A 500A EV car 60V 500V 1P 2P 3P 120 amp arc fault circuit breaker 2pole 200amp mccb

      100A 200A 300A 400A 500A EV car 60V 500V 1P 2P 3P 120 amp arc fault circuit breaker 2pole 200amp mccb

      Ready to Ship
      $13.00 - $15.00
      Min Order: 1 piece
      Shipping per piece: $17.81
      CN
      2 yrsverify
      4.8
      /5
      ·
      85 reviews
      ·
      "Excellent Service"
      Contact Supplier
      22V 28V 24V 30V 50V 60V 200V 200V 300V 50A 200A 200A 300A 400A 500A Variable DC Switching Power Supply Machine

      22V 28V 24V 30V 50V 60V 200V 200V 300V 50A 200A 200A 300A 400A 500A Variable DC Switching Power Supply Machine

      $650.00 - $750.00
      Min Order: 1 unit
      CN
      11 yrsverify
      5.0
      /5
      ·
      2 reviews
      ·
      "Excellent service"
      Contact Supplier
      DC power supply 48V 400A output

      DC power supply 48V 400A output

      $650.00 - $950.00
      Min Order: 5 pieces
      CN
      9 yrs
      5.0
      /5
      ·
      7 reviews
      ·
      "good service"
      Contact Supplier
      Industrial medium voltage generator 3ph 150a 300a 800amp 1250 amp 600v mccb moulded case circuit breakers

      Industrial medium voltage generator 3ph 150a 300a 800amp 1250 amp 600v mccb moulded case circuit breakers

      $8.00 - $30.00
      Min Order: 2 pieces
      CN
      5 yrsverify
      0.0
      /5
      ·
      0 reviews
      ·
      "timely shipping"
      Contact Supplier
      Newest Good Quality DC Operated Contactor 100A 200A 300A 400A 500A 600A

      Newest Good Quality DC Operated Contactor 100A 200A 300A 400A 500A 600A

      $50.00 - $100.00
      Min Order: 10 pieces
      CN
      11 yrsverify
      4.8
      /5
      ·
      8 reviews
      ·
      "fast shipping"
      Contact Supplier
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      About products and suppliers

      5801 300a 400a products are offered for sale by suppliers on Alibaba.com, of which moulded case circuit breakers accounts for 3%, contactors accounts for 1%, and switching power supply accounts for 1%. A wide variety of 300a 400a options are available to you, You can also choose from white, black and red 300a 400a,
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