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catalog pages of uncommon plugs
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In catalogs of electro-technical companies and retailers, published in the 1920s to 1960s you will find a large variety of plugs with uncommon combinations of pin types. Two catalog pages shown below give an impression.
During the second half of the 20st century most uncommon plug types disappeared because of an increasing standardization, but a demand for plugs for special purposes still exists (see museum section on uncommon plugs and sockets). Quite a number of nowadays uncommon plugs have pin configurations were already introduced many decades ago.


Stotz-Kontakt catalog 1939-'40

Stotz-Kontakt 1939-'40 catalog, part of page 248

Polzahl = number of poles; Stiftstellung = pin configuration.

Besides common plugs with 4 and 5 mm pins (resp. nos. 14352 and 14354), Stotz-Kontakt offered a range of plugs and sockets for special purposes. Among others no. 14219.

Stotz-Kontakt socket and type 14219 plug pins
The pin configuration of plug no. 14219 matches perfectly to the socket shown on the previous page. However, in 1939 plug 14219 was presented as a 3-pole, not earthed plug rated at 380V* - 10A.
Socket is rated at 220-380V - 10A. Moreover, the bottom left pole has a clear earth symbol, which makes sense when it is used for single phase, 220 Volt.
* 380V 3-pole means three-phase (formerly R, S, T, now L1, L2, L3), without neutral and protective earth. Three-pin, three-phase requires a balanced load between R, S and T, not uncommon in older days.

About Stotz- Kontakt
1891:  establishment of Moyé und Stotz, Elektrische Installationen in Mannhein, Germany. From 1896 Stotz und Cie,
           Elektrizitätgesellschaft, later renamed to Stotz und Cie GmbH, elektrischer Spezialapparate.
1918:  Stotz became a subsidiary of the Swiss company Brown, Boveri & Cie (BBC).
1930:  merging of Stotz (Mannhein) and Kontakt (Frankfurt am Main).
In 1939 a fire destroyed the Mannhein plant, and
           Stotz-Kontakt moved to Heidelberg.

1968:  merging of Stotz-Kontakt and the Electro division of Busch-Jaeger; shortly thereafter renamed to Busch-Jaeger
           Elektro GmbH
in Lüdenscheid. From 1985 a part of ABB (Asea Brown Boveri).


Plug pin configurations, redrawn from catalog page 70

Page 70 of 1936 Elin catalog









1936 catalog of Austrian company ELIN

not polarized, 2-pin plug with 4 mm pins (commonly used for 6A-250V plugs)

not polarized plug with 5 mm pins (used for higher amperage)

polarized 3-pin plug (comparable type, with different pin spacing, is still used in Australia for 110V, see AS/NZS page)

polarized 2-pin plug

polarized plug; probably HNA type (see previous page)

polarized, not earthed plug

polarized , earthed plug

polarized plug; could be comparable to Stotz-Kontakt 14219

4-pin plug, probably 380V 3-phase + N or protective earth.
Comparable model are still available in Poland (see 3-phase 32A socket and plug) and in Czech Republic (440V - 10A according to CSN 35 4517 = Czech norm for special plugs and sockets, see schemes)


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