EN 60255-21-2:1995

Overview

EN 60255-21-2:1995 (CLC) is a European standard, part of the EN 60255 series, that specifies shock and bump tests for measuring relays and protection equipment. It forms Section 2 of Part 21, which collectively addresses vibration, shock, bump and seismic tests. The standard covers two types of tests: the shock test (applicable to both energized and non‑energized specimens) and the bump test (applicable to non‑energized specimens). Requirements apply only to relays and protection devices in a new condition.

Key Topics

• Scope and applicability
  • Applies specifically to measuring relays and protection equipment.
  • Tests are intended for devices in a new (unaged) state.
• Test types
  • Shock test: performed on both energized and non‑energized specimens to evaluate resistance to sudden high‑acceleration impacts.
  • Bump test: performed on non‑energized specimens to assess response to repeated small impacts.
• Performance criteria
  • Ensures that mechanical integrity and functional performance are maintained after shocks and bumps.
  • Defines test procedures, specimen conditioning, and acceptance checks (functional/visual inspection and electrical operation).
• Test setup and instrumentation
  • Outlines mounting, orientation and monitoring requirements to ensure repeatable test conditions and valid results.
• Documentation
  • Emphasizes recording test conditions and outcomes for compliance and traceability.

Applications

EN 60255-21-2 is used where reliable relay operation under shock and bump conditions is critical. Typical users and applications include:

• Protection relay manufacturers - for design validation and type testing to demonstrate mechanical robustness.
• Independent testing laboratories - to perform standardized shock and bump certification.
• Power utilities and substation engineers - to specify procurement requirements that ensure equipment reliability under transport, handling or fault conditions.
• Quality assurance and compliance teams - to verify that new relays meet European test expectations before installation.

Related Standards

• EN 60255 series (electrical relays) - Part 21 covers vibration, shock, bump and seismic tests as a group.
• National adoptions of EN 60255-21-2 (identified by local standards bodies) may exist; users should check the latest regional versions or amendments.

Keywords: EN 60255-21-2, shock and bump tests, measuring relays, protection equipment, electrical relays standard, relay testing, CLC, vibration shock bump.