I don't think I have quite got it, but this may provide help for others.

ANEXO X : SECCIONADORES
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Interruptores con fusibles para circuitos de alimentación y de control. ... En los seccionadores con mando eléctrico, cuando la llave selectora esté ...
www.dpe.mosp.gba.gov.ar/energiaelectrica/anexo10.php - Cached – Similar

prolongador control remoto - Voltimum ES - El Portal del Material ...
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seccionadores Interpact INS/INV efectúan el control y la desconexión de los circuitos de[...] en el panel frontal Mando frontal y lateral (hasta INS250) de ...
www.voltimum.es/landing/prolongador control remoto.html – Cached


[PDF]
medium voltage SF6 Switchgears centros de distribución en SF6
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File Format: PDF/Adobe Acrobat - Quick View
disconnecting switch desconectador fusible fuse disconnecting switch seccionador- interruptor Aut. disconnecting switch-automatic circuit breaker empalme ...
www.rhona.cl/prontus_rhona/site/artic/20080414/asocfile/......


IMPI: Instituto Mexicano de la Propiedad Industrial
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Título en inglés (ET), MEDIUM-VOLTAGE CIRCUIT-BREAKER AND DISCONNECTOR MODULE, ... a multipole circuit-breaker and disconnector units where disconnection is ...
www.pymetec.gob.mx/patentex.php?pn_num=MXPA00001499...

S&C Electric Company - Chile | SupplyMine
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S&C Electric Company - Chile, Electrical Equipment Electrical Equipment. ... Eslabones Fusible Positrol®; Seccionadores Loadbuster Disconnects ®. ... S&C offers an unprecedented variety of substation switching and protection products, ...
www.infomine.com/.../S&C_Electric_Company_-_Chile.html - Cached - Similar


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Note added at 1 hr (2010-01-29 09:43:18 GMT)
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or rather

disconnectION unit

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Gas insulated switchgear disconnector arrangement - US Patent ...
main circuit disconnector units for three phases and a shunt circuit ... each main circuit disconnector unit and the shunt circuit disconnector unit having ...
www.patentstorm.us/patents/4821140/claims.html
#
Medium-voltage circuit-breaker and disconnector module, and a ...
three multipole circuit-breaker and disconnector units aligned within and completely housed by the metal enclosure, each multipole circuit-breaker and ...
www.patentstorm.us/patents/6232571/claims.html

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Note added at 1 hr (2010-01-29 09:43:40 GMT)
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so

amendment

disconnector unit controls

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Note added at 1 hr (2010-01-29 09:45:49 GMT)
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Control and automation of electrical power distribution systems - Google Books Result
James Northcote-Green, Robert Wilson - 2006 - Technology & Engineering - 464 pages
4.2.2 SUBSTATION DISCONNECTORS A disconnector is normally applied to a power ... the simplest nonextensible configuration being the ring main unit (RMU). ...
books.google.co.uk/books?isbn=0824726316...

especially if, as I suspect, this relates to sub-stations supplying oower to a rail system ?
For the "mando", I suspect you now that it is a 'control'

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Note added at 1 hr (2010-01-29 09:46:34 GMT)
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or it could simply be section cut-outs/circuit breakers, if I have guessed the context wrongly