Overview
IEC 61812-1:2011 establishes the general requirements and tests for time relays intended for both industrial and residential applications. Published by the International Electrotechnical Commission (IEC), this standard provides a harmonized framework for the design, performance, and safety evaluation of time relays used in control, automation systems, and various electrical applications.
This edition of IEC 61812-1 introduces significant updates, including the addition of industry-recognized terms and definitions, illustrative timing charts for better understanding of relay operations, and expanded provisions for relays used in residential environments.
Key Topics
- Scope of Application: The standard covers time relays designed for use in industrial automation, signal processing, control equipment, and residential electrical systems.
- General Definitions: Updated terms and relay classifications, aligned with current industry usage, ensure clarity and standardization.
- Relay Types: Defines various time relay operating modes, including on-delay, off-delay, flasher, star-delta, and interval relays.
- Testing Requirements: Specifies methods for type testing, including functional performance, insulation, endurance, temperature resistance, vibration, and EMC tests.
- Performance Criteria: Covers crucial aspects such as setting accuracy, repeatability, recovery time, and minimum control impulse duration.
- Environmental Factors: Addresses acceptable ranges for ambient temperature, humidity, pollution degree, and altitude.
- Safety and Marking: Requirements for relay documentation, marking, clearances, creepage distances, and protection against electric shock.
- EMC Compatibility: Criteria to ensure electromagnetic compatibility in both industrial and residential use cases.
Applications
IEC 61812-1:2011 is applicable to a broad spectrum of electrical installations and products, including:
- Industrial Automation: Time relays facilitate precise control in programmable logic controllers (PLCs), conveyor systems, and machinery.
- Residential Electrical Controls: Ensures safe and reliable operation of relays in household appliances, lighting controls, and building automation systems.
- Signal Processing: Used for sequencing, time-delay, and interval operations in signaling equipment.
- Motor Starting: Star-delta relays covered under this standard simplify motor starting processes in both industrial and commercial installations.
- Energy Management: Supports integration into energy monitoring, control panels, and smart building networks.
Employing time relays conforming to IEC 61812-1 guarantees interoperability, reliability, and compliance with international safety and performance criteria, facilitating easier product approvals and market access globally.
Related Standards
- IEC 61810-1 – Electromechanical elementary relays – General requirements
- IEC 62314 – Solid-state relays
- IEC 60068 series – Environmental testing methods
- IEC 60730-2-7 – Automatic electrical controls for household and similar use
- IEC 60669-2-3 – Switches for household and similar fixed electrical installations
- IEC 60529 – Degrees of protection provided by enclosures (IP Code)
- IEC 61000-4 series – Electromagnetic compatibility (EMC) test methods
Manufacturers, installers, and designers following IEC 61812-1:2011 benefit from reduced risk of non-compliance, enhanced product safety, and increased confidence in product performance in diverse application environments. This standard is a vital reference for anyone involved in the selection, installation, or evaluation of time relay devices in both industrial and residential settings.