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Time relays for industrial and residential use - Part 1: Requirements and tests. IEC 61812-1:2011. Original standard IEC 61812-1-2011 in PDF full version. Additional info + preview on request

Document status: Replaced by St IEC 61812-1-2023

Ultrasonics - Focusing transducers - Definitions and measurement methods for the transmitted fields. Original standard IEC 61828-2001 in PDF full version. Additional info + preview on request

Document status: Replaced by St IEC 61828-2020

Surface mounted piezoelectric devices for frequency control and selection - Standard outlines and terminal lead connections - Part 2: Ceramic enclosures. Original standard IEC 61837-2-2018 in PDF full version. Additional info + preview on request

Document status: Replaced by St IEC 61837-2-2026

Ultrasonics - Pressure pulse lithotripters - Characteristics of fields. IEC 61846:1998. Original standard IEC 61846-1998 in PDF full version. Additional info + preview on request

Document status: Replaced by St IEC 61846-2025

Communication networks and systems for power utility automation - Part 4: System and project management. IEC 61850-4:2011. Original standard IEC 61850-4-2011 in PDF full version. Additional info + preview on request

Document status: Active

Communication networks and systems for power utility automation - Part 5: Communication requirements for functions and device models. IEC 61850-5:2013. Original standard IEC 61850-5-2013 in PDF full version. Additional info + preview on request

Document status: Active