| Subject | English | Spanish |
| mater.sc. | closed circuit | corriente en circuito cerrado |
| tech. | closed circuit | circuito eléctrico que se completa generalmente al cerrar un interruptor |
| el. | closed circuit | en circuito cerrado |
| commun. | closed circuit | circuito cerrado |
| radio | closed circuit | circuito local |
| mech.eng. | closed circuit | ciclo cerrado |
| mech.eng. | closed circuit | conduccion en circuito cerrado |
| mater.sc. | closed circuit | corriente de vigilancia |
| mech.eng., el. | closed circuit cooling | circuito de refrigeración cerrado |
| el. | closed circuit cooling water system | sistema de agua de refrigeración de circuito cerrado |
| fin., agric. | closed circuit holding | explotación de ciclo cerrado |
| lab.law., transp. | closed circuit oxygen equipment | equipo de oxígeno en circuito cerrado |
| commun., transp. | closed circuit television | circuito cerrado de televisión |
| commun., transp. | closed circuit television | televisión en circuito cerrado |
| tech. | closed circuit television | televisión de circuito cerrado |
| med. | closed circuit television | televisión en circuido cerrado |
| mech.eng., el. | closed circuit transition autotransformer starting | arranque con autotransformador sin apertura de circuito |
| el.mot. | closed circuit transition auto-transformer starting | arranque por autotransformador sin corte |
| commun. | closed circuit TV | circuito cerrado de TV |
| accum. | closed circuit voltage | tensión de descarga de un elemento o de una batería |
| accum. | closed circuit voltage | tensión en circuito cerrado |
| el. | closed circuit voltage | tensión a circuito cerrado |
| gen. | closed circuit water relay | relé de agua de circuito cerrado |
| earth.sc., tech. | closed circuit wind tunnel | túnel aerodinámico de circuito cerrado |
| commun. | closed-circuit alarm device | dispositivo de alarma con circuito cerrado |
| med., unions. | closed-circuit breathing apparatus | respirador de circuito cerrado |
| med., unions. | closed-circuit breathing apparatus | aparato respiratorio de circuito cerrado |
| el. | closed-circuit cell | elemento de circuito cerrado |
| el. | closed-circuit contact | contacto de trabajo |
| mech.eng. | closed-circuit cooling | refrigeración en circuito cerrado |
| mech.eng. | closed-circuit cooling | refrigeración de circuito cerrado |
| el. | closed-circuit coupling | acoplamiento en circuito |
| nat.sc., agric. | closed-circuit evacuation of residual water | evacuación de las aguas residuales por circuito cerrado |
| mech.eng. | closed-circuit lubrication | engrase en circuito cerrado |
| mech.eng. | closed-circuit lubrication | engrase por circulación |
| gen. | closed-circuit monetization | monetización de circuito cerrado |
| mech.eng. | closed-circuit oiling | engrase en circuito cerrado |
| mech.eng. | closed-circuit oiling | engrase por circulación |
| mech.eng. | closed-circuit pressure lubrication | engrase a presión en circuito cerrado |
| chem., el. | closed-circuit radiator | radiador de circuito estanco |
| transp. | closed-circuit routing | itinerario en circuito cerrado |
| mater.sc., mech.eng. | closed-circuit steam-heating | calefacción por vapor en circuito cerrado |
| commun., IT, tech. | closed-circuit television | televisión en circuito cerrado |
| telecom. | closed-circuit television | circuito cerrado de televisión |
| radio | closed-circuit television | CCTV |
| commun., IT | closed-circuit user group | grupo de usuarios en circuito cerrado |
| commun., IT | closed-circuit user group | grupo cerrado de usuarios |
| mech.eng. | closed-circuit water cooling | refrigeración por agua en circuito cerrado |
| commun. | closed-circuit working | transmisión por interrupción de corriente |
| commun. | closed-circuit working | transmisión por apertura de circuito |
| accum. | initial closed circuit voltage | tensión inicial en circuito cerrado |
| accum. | initial closed circuit voltage | tensión inicial de descarga |
| lab.law. | insulating appliance with closed circuit | aparato aislante de circuito cerrado |
| med., unions. | self-contained closed-circuit breathing apparatus | respirador de circuito cerrado |
| med., unions. | self-contained closed-circuit breathing apparatus | aparato respiratorio de circuito cerrado |
| lab.law. | self-contained closed-circuit oxygen breathing apparatus, compressed oxygen type | respirador autónomo de circuito cerrado de oxígeno comprimido |
| lab.law. | self-contained closed-circuit oxygen breathing apparatus, liquid oxygen type | respirador autónomo de circuito cerrado de oxígeno líquido |
| lab.law. | self-contained closed-circuit oxygen breathing apparatus, oxygen generating type | respirador autónomo de circuito cerrado de generación de oxígeno |