Name: IEC 60947-2:2016/AMD1:2019 — Amendment 1 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
SKU: IEC 60947-2:2016/AMD1:2019
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IEC 60947-2:2016/AMD1:2019 PDF — Amendment 1 - Low-voltage switchgear and controlgear - Part 2: Circui… — GOST Standards

Scope and Application The amendment expands the scope to emphasize circuit-breakers intended for use by trained operators. It covers aspects such as use in variable frequency drive downstream circuits, marine environments, traction systems, and explosive atmospheres requiring special considerations.
Normative References Update Updated references include key IEC standards like IEC 61000-4-2 for electromagnetic compatibility (EMC), IEC 61140 for protection against electric shock, and CISPR 11 and 32 for radio frequency disturbance limits. Older references to IEC 60364 and CISPR 22 have been removed to maintain relevance.
New Definitions and Device Types The standard introduces definitions such as "closing release," referring to auxiliary devices responsible for triggering the closing function of circuit-breakers. It also expands the classification of release types to include shunt releases, undervoltage releases, and closing releases.
Marking Requirements Detailed marking criteria ensure circuit-breakers carry essential operational and safety information clearly visible or marked on the device, including:
- Rated current and voltage
- Indications for isolation suitability
- Manufacturer identification and compliance with IEC 60947-2
- Rated short-circuit breaking capacities
- Terminal identification and protective earth markings
- Auxiliary device ratings and control circuit data
Installation, Operation, and Maintenance Instructions The amendment mandates clear user guidance, including additional information for safe decommissioning and dismantling, especially where hazardous conditions due to stored energy or materials could be present.
Thermal and Electrical Performance Testing Updated requirements for temperature rise limits, short-circuit testing with metallic screening, and torque application during terminal connections ensure circuit-breakers operate safely under nominal and fault conditions.
Test Sequences and Sample Quantities Clarifications in test sequence applicability and sample sizes enhance the reliability of conformity verification for 1-, 2-, 3-, and 4-pole circuit-breakers, taking into account selectivity categories and rated current specifications.

IEC 60947-2:2016/AMD1:2019 PDF

Abstract

Overview

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