Katkaisijoihin

Katkaisijoihin is the illative plural form of the Finnish noun katkaisija, a term that refers to a device that interrupts an electrical circuit, commonly known in English as a circuit breaker or a disconnecting switch. In Finnish technical usage, katkaisija denotes a protective device designed to cut off current to prevent damage or hazards in electrical installations. The illative plural katkaisijoihin is used to indicate movement toward or inclusion within multiple circuit breakers, for example in planning, maintenance, or safety contexts.

In grammatical terms, katkaisijoihin is formed from the plural stem katkaisijo- with the illative plural suffix -ihin. This form answers questions like “to where?” or “into which?" applied to multiple katkaisija units. It contrasts with katkaisijat (nominative plural, “circuit breakers”) and katkaisijoiden (genitive plural, “of circuit breakers”). The form is common in technical manuals, safety documentation, and engineering texts when referring to actions, locations, or considerations involving several breakers.

Typical contexts for katkaisijoihin include maintenance procedures, safety planning, and system design. For instance, texts may discuss requirements and procedures related to katkaisijoihin liittyvät turvatoimet (safety measures related to circuit breakers) or refer to inspections tied to katkaisijoihin kuuluvat laitteet (devices that belong to the group of circuit breakers). The term helps specify scope when multiple breakers are involved, rather than a single unit.