ISO 1033-1975 PDF

Full title and description

ISO 1033:1975 — Aircraft — Dimensions for general purpose push-pull three-pole circuit-breakers. This short international standard specifies the external and panel-mounting dimensions for push‑pull three‑pole circuit-breakers intended for aircraft use, including the required panel cut-out and mounting-hole details.

Abstract

ISO 1033:1975 defines the physical dimensions and panel cut-out details for general-purpose push‑pull three‑pole circuit-breakers of ratings up to and including 35 A. The standard gives dimensional drawings for the portion of the breaker projecting through the mounting panel and for mounting-hole layouts; a small panel hole is included as an option to prevent rotation of the breaker.

General information

• Status: Published (original 1975 edition; listed in ISO catalogue; review/revision noted).
• Publication date: December 1975 (1975-12).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.060 — Aerospace electric equipment and systems.
• Edition / version: Edition 1 (1975).
• Number of pages: 1.

Scope

This standard applies to general-purpose push‑pull three‑pole circuit-breakers intended for aircraft installations. It specifies the external dimensions of the breakers (including the part projecting through the mounting panel), the panel cut-out shape and size, and the recommended positions and sizes of mounting holes. Ratings covered in the standard are up to and including 35 A. The intent is to ensure dimensional interchangeability and reliable mounting of such circuit-breakers in aircraft panels.

Key topics and requirements

• Dimensional drawings for the breaker body and the portion projecting through the panel.
• Panel cut-out geometry and maximum/minimum tolerances for the cut-out.
• Mounting-hole positions and sizes required to secure the breaker to the panel.
• Provision for a small anti‑rotation panel hole to prevent breaker rotation after installation.
• Rated current limitation covered by the dimensional specification (up to and including 35 A).

Typical use and users

ISO 1033:1975 is used by aircraft electrical and avionics engineers, switchgear and aircraft component manufacturers, maintenance organizations, installation technicians and procurement/specification teams to ensure compatible dimensions and mounting arrangements for push‑pull three‑pole circuit-breakers. It is also referenced by certification and conformity assessment activities where physical interchangeability and panel fit are required.

Related standards

Standards covering related topics include international and industry documents on electrical components and aircraft equipment (for example, standards for electrical switchgear and circuit-breakers, environmental and installation requirements for aircraft equipment, and aerospace component qualification publications). ISO 1033 is focused on dimensional interchangeability and is normally used alongside performance, environmental and safety standards that address electrical and functional requirements for aircraft circuit-breakers.

Keywords

ISO 1033, aircraft circuit-breaker dimensions, push-pull three-pole, panel cut-out, mounting holes, aircraft electrical equipment, dimensional interchangeability.

FAQ

Q: What is this standard?

A: ISO 1033:1975 is an international standard that specifies the physical dimensions and panel-mounting details for general-purpose push‑pull three‑pole circuit-breakers used in aircraft.

Q: What does it cover?

A: It covers external breaker dimensions, the shape and size of the panel cut-out, mounting-hole positions and sizes, and an optional small anti‑rotation hole; the dimensional requirements apply to breakers rated up to and including 35 A.

Q: Who typically uses it?

A: Aircraft and avionics designers, component manufacturers, maintenance and installation personnel, procurement/specification teams, and certification bodies use the standard to ensure correct panel fit and mechanical interchangeability.

Q: Is it current or superseded?

A: The document is the 1975 published edition. It remains listed as the ISO 1975 publication for this subject but is subject to the ISO periodic review/revision process; users should check the latest ISO catalogue or their national standards body for any revision, confirmation, replacement or withdrawal before relying on it for new designs.

Q: Is it part of a series?

A: ISO 1033:1975 is a single, standalone dimensional standard for a specific type of aircraft circuit-breaker. It is aligned with other aerospace and electrical equipment standards produced by ISO/TC 20/SC 1 but is not presented as a multipart series.

Q: What are the key keywords?

A: Aircraft circuit-breaker, push-pull, three-pole, dimensions, panel cut-out, mounting holes, dimensional interchangeability, aerospace electrical equipment.