Functional units are classified by their level of compartmentation and type of electrical connection.

 

  • Read more about Functional Units

    An extensive range of standard parts offers complete freedom in design:

    Internal separation from Form 1 to Form 4B, IEC 61439-2&1
    Fixed units (FFF)
    Removable units (WFD)
    Withdrawable units (WWW)
    Different types of functional units can be mixed within the same assembly or section, in order to efficiently meet requirements regarding continuity of supply, service conditions or budgetary constraints.

    Due to the complete modularity of the system, the physical dimensions of the functional units can be varied in all 3 axes. This allows complete optimisation of design with respect to the overall dimensions of the assembly, heat dissipation, service and maintenance.
    Electrical equipment from most manufacturers may be fitted in accordance with the manufacturer's preferences.

    To secure the overall safety level of the assembly all components are manufactured from steel or high grade polymer to resist the spread of fire.

     

  • Functional Units Fixed

    A fixed type panel is characterised as a panel mounted with components assembled and wired on mounting plates, and connected to the main-circuit by cable or copper connections. The panels can be designed with internal form of separation, Form 1-4 acc. to IEC 61439-2&1.
    The panels can be designed with internal form of separation by steel compartmentation according to IEC 61439-2&1, Form 1-4 and according to BS 61439-1&2.

    In the case of fixed parts, the connections of main-circuits can only be established or broken when the panel not live. In general, removal and installation of fixed parts requires the use of a tool.

    The connection or disconnection of a fixed part normally requires the disconnection of the complete panel or part of it.
    In order to prevent unauthorised operation, the switching device may be provided with means to secure it in one or more of its positions.

    - Adjustable depth mounting plates
    - Non ferrous gland plates
    - Metal or plastic cable box
    - Sizes: 4 widths, 16 heights, 6 depths

     

  • Functional Units Draw-Out

    All standard sections are equipped to fit - Removable units (RMU), Withdrawable units (WDU), Mini withdrawable unit (MDU), Inline units (ILU)

    All units fully interchangeable and upgradeable (except ILU's)
    A removable type panel is characterised as a panel where a part may be removed entirely from the panel and replaced even though the circuit to which it is connected may be live.
     

    The removable parts shall be so designed that their electrical equipment can be safely disconnected from or connected to the main-circuit whilst this circuit is live. Minimum clearances and creepage distances as described in IEC 61439-2&1.

    Removable parts shall have a connected position and a removed position. 
     

    A withdrawable type panel is characterised as a panel where the removable parts can be moved to a position where an isolating distance is established, whilst remaining mechanically attached to the panel. The isolation distance shall comply with IEC 61439-2&1 clause 7.1.2.2.  The withdrawable parts shall be so designed that their electrical equipment can be safely disconnected or connected to the main-circuit whilst this circuit is live.

     

    Removable Units Type
              High protection against contact
              Rating up to 630 A, 500 kW, 690 V
              Fixed or hinged front panel
              Coding system
              Front or rear access
              Unique safety locking mechanism
              Fully re-configurable while live
              Accommodates components from many manufacturers
              DeviceNet & Profibus connection          
              Sizes: X = 3, 4 Y= 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4.
              Up to 20 units per section

     

    Withdrawable
              High operational safety
              Rating up to 630 A, 500 kW, 690 V
              Auxiliary controls up to 46 control pins
              Fully re-configurable while live
              Coding system
              Safe operation...IP20 protection in all positions
              Front or rear access
              Fixed or hinged front panel
              Unique safety locking mechanism
              Accommodates components from many manufacturers
              DeviceNet & Profibus connection         
              Sizes: X = 3, 4 Y = 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4
              Up to 20 units per section
             

    Mini-Withdrawable
              High personal protection
              Rating up to 80 A, 55 kW, 690 V
              Auxiliary controls up to 46 control pins
              Front or rear access
              Removable interface box
              Interface box can be prewired
              Fully re-configurable while live
              Unique safety locking mechanism
              Accommodates components from many manufacturers
              Coding system
              DeviceNet & Profibus connection
              Sizes: X = 1, 1.5, 2, 3 Y = 1
              Up to 40 units per stack