STC TELEPHONE No. 4002


No. 4002-A - SELECTOR SET
This is a combined Selector and Telephone Set designed for use as a way station on continuously manned traffic control lines (pictured to the right).

It houses one 4304-A Selector (which must be ordered separately).

Weight - 8.75lb. (3.97kg.)
Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)

 

No. 4002-B SELECTOR SET
This set is similar to the 4002-A but is provided with a protector and line looping key for calling control. It houses one 4304-A Selector (which must be ordered separately).

Weight - 8lb. 14oz (4kg.)
Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)

 

No. 4002-C SELECTOR SET
This is similar to the 4002-A except that no protector is fitted and the ring-back tune is removed from the line when the microtelephone is fitted from the switch hook.

The terminal strip for making external connection is fitted outside the case and may be provided with an insulated cover if ordered separately. It houses one 4304-A Selector (which must he ordered separately).

Weight - 8lb. 14oz. (4kg.)
Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)

 

No. 4002-D SELECTOR SET
The 4002-D Selector Set is a Traffic Control Way Station Set designed for use in conjunction with a 4304-A Selector on tines of up to 50 miles in length. having a maximum of 20 Sets bridged across the tine.  This Set is not suitable for use where General Call or Group Calling is required.

Dimensions - 9in. x 11in. x 7in. (23 x 23 x 18 cm.)

 

No. 4002A is taken from:-
STC Catalogue for Railway Systems Apparatus, D/DT. 17D1, Edition 1 (1957)


 

 

Circuit diagram

 

 

 
 
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Last revised: November 19, 2023

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