"borne" and "terminal" are similar if used as noun. But here "terminal" is adjective.

en terminal
conductive part of a device, electric circuit or electric network, provided for connecting that device, electric circuit or electric network to one or more external conductors
Source: 151-12-12
fr terminal
borne, f
partie conductrice d’un appareil, d’un circuit électrique ou d’un réseau électrique, destinée à le connecter à un ou plusieurs conducteurs extérieurs
Source: 151-12-12 MOD
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...

Terminal (adj) means final (at the end of something)

plaque terminale nf end organ
:
Épreuve Terminale et une Épreuve de Rattrapage
Etre en phase terminale
Finir ses études de terminale - forum Français Seulement
Je suis en terminale section économique
phase terminale - stade terminal
http://www.wordreference.com/fren/terminale

terminal, ~e1 , mpl ~aux /tɛʀminal/ , /o/
adjective [année] final;
phase ~e (d'une opération) concluding phase;
(d'une maladie) terminal phase.
http://www.wordreference.com/fren/terminal

I understand "Bornes Terminales" as the last terminal block.

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Note added at 6 hrs (2011-12-21 00:05:14 GMT)
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Einpolige Endklemme mit Einführungstrichter
1-pole end terminal with cable entrance
Borne terminale unipolaire avec entrée de conducteur en entonnoir
http://www.electrocomp.ee/pdf/pollmann_kataloog.pdf

"end terminal" is a good alternate, even better translation.

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Note added at 1 day2 hrs (2011-12-21 19:14:11 GMT)
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Why the links provided by Liz do not support her proposal:

Most links are unilingual, what not allow verification, only the Wago-link has as sister page in French.

A range of rail-mounted terminal blocks for all industrial and Exe applications as well as building installation. All terminal blocks with CAGE CLAMP® S connection.
http://www.wago.us/products/278.htm

This corresponds to :
Le programme de bornes sur rail pour toutes les applications industrielles (aussi Exe) et l'automation du bâtiment. Toutes les bornes avec connexion CAGE CLAMP® S.
http://www.wago.com/cps/rde/xchg/SID-00435E21-6B1A8AB1/wago/...

No mention of “bornes terminals”. Note: As electrical engineer and factory inspector I know the WAGO products very well, including that shown.

The Howrah-Page shows a terminal connector, as used for terminating cables in substations or for overhead lines. But again, no proof is given for the French equivalent. The same is valid for the Kaibogroup-page.

Even Linguee does not translates “terminal connector” by “borne terminal”, but by “connecteur de la borne”. Observe the inversion (Sic!).

You can input the audio of an external device, (such as a Portable music player) to the AUX Input Terminal connector of this unit. alpine.ch
[...] d'un périphérique externe (un lecteur portable, par exemple) au connecteur de la borne d'entrée AUX de cet appareil. alpine.ch
http://www.linguee.fr/francais-anglais/search?source=auto&qu...

The term “terminal connector” exists, but is translated differently:

en
Terminus half-connector terminal
Zuverlässigkeit 3 (Zuverlässig)
Quelle OJEC L 384,31.12.1986
Datum 24/09/2003
fr
Terminus borne de raccordement pour les prises
Zuverlässigkeit 3 (Zuverlässig)
Quelle JOCE L 384,31.12.1986
Anmerkung chariot élévateur
Datum 24/09/2003

http://iate.europa.eu/iatediff/SearchByQuery.do?method=searc... connector&sourceLanguage=en&domain=0&matching=&start=0&next=1&targetLanguages=de&targetLanguages=en&targetLanguages=fr

No bilingual site found, where "borne terminal" and "terminal connector" is used for the same item.
http://www.google.de/search?q="borne terminal" "terminal con...

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Note added at 1 day2 hrs (2011-12-21 19:28:33 GMT)
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I have to add what "traversée" means. Apart from the standard "IEC 61378-2" linked in the discussion, the IEC glossary (Electropedia) has explained that term:

en (insulating) bushing
insulator forming a passage for a conductor through a non-insulating partition
fr isolateur de traversée, m
traversée, f
isolateur permettant le passage d'un conducteur à travers une paroi non isolante
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...

en bushing type current transformer
a current transformer without primary conductor and primary insulation of its own which can be fitted directly over an insulated bushing or conductor
fr transformateur de courant pour traversée
transformateur de courant sans enroulement primaire et sans isolation propre qui peut être disposé directement sur une traversée ou sur un conducteur isolé
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...

For additional definitions enter "traversée"
http://www.electropedia.org/iev/iev.nsf/Welcome?OpenForm&Seq...