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| Subject | English | Spanish |
| el. | change-over break before make contact | contacto sin efecto puente |
| el. | change-over break before make contact | contacto de dos direcciones sin solape |
| PSP | change-over break-before-make contact | contacto inversor sin solape |
| el. | change-over make before break contact | contacto con efecto de puente |
| el. | change-over make before break contact | contacto de dos direcciones con solape |
| el. | change-over make before break contact | contacto de puenteado |
| PSP | change-over make-before-break contact | contacto inversor con solape |
| math. | make change | calcular el cambio (If the emphasis is on computation, use calcular; if the emphasis is on providing the change, use dar. In general Spanish uses the article in a phrase like calcular el cambio, but note that one might use calcular cambio in headings, just as one would use Sumar fracciones as a title but use Suma las fracciones as a direction) |
| math. | make change | dar cambio |