MCBs

Compact automatic switches designed to protect low-voltage electrical circuits from damage caused by excess current or short circuits.

Siemens | SENTRON 5SY Series

Siemens SENTRON MCBs are engineered for high-availability industrial environments. They are particularly favored for their “Supplementary Protector” status (UL 1077), making them the ideal choice for protecting sensitive devices inside a control panel where a main branch breaker is already present.

SENTRON 5SY

Model Number: 5SY4216-5

High breaking capacity (up to 25kA); optional top or bottom infeed; Type A, B, C, and D curves.

Key Technical Specifications:

  • Allows for two wires of different cross-sections to be connected simultaneously (e.g., a power cable and a busbar).

  • Individual units can be removed from a busbar assembly without removing adjacent breakers or using a screwdriver.

  • Ships with extensive marine (DNV, GL) and North American (UL/CSA) approvals for machinery being exported worldwide.

SENTRON 5SL

Model Number: 5SL4101-6

Optimized for infrastructure and light industry; tool-free mounting; compatible with arc fault detection.

Key Technical Specifications:

  • Ships with extensive marine (DNV, GL) and North American (UL/CSA) approvals for machinery being exported worldwide.

  • Individual units can be removed from a busbar assembly without removing adjacent breakers or using a screwdriver.

  • Allows for two wires of different cross-sections to be connected simultaneously (e.g., a power cable and a busbar).

Schneider Electric | Acti9 iC60 Series

The Acti9 series by Schneider is widely considered the most “intelligent” MCB system on the market. It is sourced for its unique safety indicators (VisiTrip and VisiSafe) which significantly reduce troubleshooting time for maintenance teams by providing an immediate visual signal of which circuit has faulted.

Acti9 iC60N

Model Number: A9F54120

VisiTrip™ fault indicator; VisiSafe™ green strip for safety; up to 50kA breaking capacity.

Key Technical Specifications:

  • A mechanical red flag appears in a window on the front face to instantly identify a tripped circuit amongst a row of breakers.

  • A green strip visible on the toggle guarantees that the downstream circuit is physically isolated and safe for maintenance.

  • The contacts snap shut at high speed regardless of how fast the operator flips the toggle, drastically reducing internal wear and arcing.

Acti9 C120

Model Number: A9N18467

High-current MCB for larger industrial loads; available in B, C, and D curves; high mechanical durability.

Key Technical Specifications:

  • The contacts snap shut at high speed regardless of how fast the operator flips the toggle, drastically reducing internal wear and arcing.

  • A green strip visible on the toggle guarantees that the downstream circuit is physically isolated and safe for maintenance.

  • A mechanical red flag appears in a window on the front face to instantly identify a tripped circuit amongst a row of breakers.

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