BC 313
Main station set (extension switch) for ZB/SA operation in sheet metal housing.

Scandinavian mini private branch exchange for 1 main and 2 extensions.

This model can be found with the original style Ericsson handset or the later Bakelite handset.

A crank switch can be used to select between exchange line, intercom and extension calls. The terminals are called by crank inductor, these also have an inductor for calling the intermediate station.

Under the glass window, on top of the case, is a lattice indicator to show if the extension is busy the the switch in the intercom position.

For the crank switch, 1 = main line, 2 = extension; in centre position (upwards): Switched through.

Incoming exchange calls ring a wall mounted bell.

Made by KTV.

Circuit diagram BC303 (ZB version) for the BC313 (SA) the number switch is added

Last revised: June 06, 2024