The Supercompact D.C. Switchboards SC68 are metal-enclosed functional units, withdrawable type and internally electric arc proof version. The Supercompact D.C. Switchboards SC68 are suitable for different railway applications, tram, trolley bus and subway for fixed and mobile installations.

SC68 series includes compartments characterized by extremely compact dimensions; its small size allows use in environments with extremely limited space (fixed installations in modular boxes or mobile electrical substations for road/rail transportation).

The SC68 switchboards series are modular units containing fixed and / or removable circuit-breakers and disconnectors for the distribution, disconnecting and protection for the feeding of traction systems.

The SC68 switchboards can be adapted to suit the needs of projects of any type; they allow the utilization of components (High Speed Circuit Breaker, VLD, Switch-Disconnectors) made by different manufactures.

Extremely compact dimensions
• Wide = 600/800mm
• Minimum depth = 1300mm
• Height = 2500mm

Ease of installation
• Reduced dimensions and weights
• Solution adapted to cable connection

Ease and safe to operate
• Internally arc proof version
• Compartmented cubicles
• Mechanical safety interlocks

FEEDER PANEL
The functional feeder units are destined to feed and protect a well-defined part of the DC power line.

Feeder panel contains:
• D.C. High Speed Circuit Breaker (withdrawable)
• earthing switch
• line test system
• measuring transducers
• PLC for remote command and control
• control panel on front compartment comprehensive of push buttons and selectors for local control
• multifunction protection relay (76 / 64)

DISCONNECTING SWITCH PANEL
The Disconnecting Switch Panel is inserted between two feeder panel and allow connection of by-pass between the outputs.

The panel contains:
• switch-disconnector (withdrawable)
• surge arresters
• voltage relay
• control panel on front compartment comprehensive of push buttons and selectors for local control

TWO-POLE DISCONNECTOR PANEL
Two-pole disconnector compartment is destined to disconnect the rectifier from busbars and switch on/off the capacitor.

The compartment contains:
• motorized D.C. two-pole disconnector (withdrawable)
• earthing switch
• measuring transducers
• PLC for remote command and control
• control panel on front compartment comprehensive of push buttons and selectors for local control
• multifunction protection relay (32 / 64)

SAFE…ROBUST…RELIABLE
The frames and trolleys of the super-compact switchboards SC68 series are fully welded to form a self-supporting non-deformable structure and extremely robust. SC68 are therefore highly reliable about:

• Solidity and robustness both during the normal operating operations that in the presence of any electrodynamic stresses
• Dimensional stability and integrity during the lifting operations (complete with trolley)
• Dimensional stability in case of installation on not perfectly flat floors
• Operator protection in the case of an internal electric arc

TYPE AND ACCEPTANCE TEST
The SC68 D.C. switchboards are manufactured and tested according to the existing standards, in particular:
EN 50123-1 / EN 50123-6 / EN 50124-1 / IEC 62271-200

TYPE-TEST
The applicated type-tests comply to standard EN 50123-6 are as follows:
• Impulse withstand
• Power-frequency voltage
• Short-time withstand current
• Verification of degree of protection
• Temperature-rise
• Arc Proof

ROUTINE TEST
Every single panel is subjected to individual acceptance tests including the entire simulation of operation logics.

The SC68 D.C. panel are tested to arcing due to internal fault at the IPH Laboratory in Berlin according to IEC 62271-200. The arc proof has been tested on all 4 sides (classification IAC AFLR 90kA 0.25s).