ERICSSON
SWITCHBOARD
No's N400, N410, N420, N450 & N451

N 420		N 450

The "central battery signalling" system is developed to meet the case where, owing to the small size of the installation, it is not
considered economical to install a full C.B. system.

These switchboards embody the very latest improvements, afford the advantages of automatic call and clear and provide standard operating facilities which are very desirable in areas where the larger exchanges are C.B. or automatic.

The woodwork is matt polished and the metal fittings are finished in black and copper bronze.

The totally enclosed type of indicator is fitted throughout and a 22-volt battery of large type primary cells will operate these switchboards.

The floor type switchboard is eminently suitable where an ultimate of three operators' positions is anticipated. It has capacity for 20 incoming junctions, 40 outgoing junctions, 10 miscellaneous circuits, 180 subscribers' lines and 200 multiple.

The local cable supplied and fitted is arranged for 10 incoming junctions, 20 outgoing junctions and 120 subscribers' lines, so that if wiring is required for a greater ultimate equipment, it must be specially ordered. Space is provided on the keyboard for an automatic dial.

Part of the top panel (at the side) is removable, so as to provide cabling space when two or more sections are lined up. A cable rack for supporting the cables is also incorporated in the top panels.

Other sizes are also manufactured, particulars on request.


Taken from the Ericsson Telephone Catalogue issue no. 49

Last revised: November 24, 2025