IEC 61558-2-7:2023

Overview

IEC 61558-2-7:2023 - Part 2-7 of the IEC 61558 series - specifies particular safety requirements and tests for transformers and power supply units for toys. This third edition (2023) replaces the 2007 edition and is a technical revision that aligns structure and references with IEC 61558-1:2017 and introduces a new symbol for linearly regulated outputs. It is published as a group safety publication under IEC Guide 104.

Key scope points:

• Applies to stationary and portable, single‑phase, air‑cooled dry transformers for toys and power supplies incorporating transformers and electronic circuits.
• Rated supply voltage up to 250 V AC, frequency up to 500 Hz, rated output up to 200 VA, and output current up to 10 A.
• Limits no‑load and rated output voltages (e.g., no‑load ≤ 33 V AC or ≤ 46 V ripple‑free DC; rated output ≤ 24 V AC or ≤ 33 V ripple‑free DC).
• Covers encapsulated and non‑encapsulated windings; excludes external circuits connected to device terminals.

Key Topics and Requirements

IEC 61558-2-7:2023 supplements IEC 61558-1:2017 and addresses toy‑specific hazards with requirements and tests such as:

• Protection against electric shock (SELV considerations)
• Marking and user information specific to toy applications
• Output voltage/current performance under load and no‑load conditions
• Short‑circuit and overload protection
• Heating and temperature limits in normal and fault conditions
• Insulation resistance, dielectric strength, leakage current
• Mechanical strength and impact testing for robustness in toy use
• Ingress protection against dust and moisture
• Construction, components and internal wiring requirements
• Terminals, earthing provisions, creepage and clearance distances
• Resistance to heat, fire, tracking and corrosion

The standard contains specific test arrangements, figures (e.g., test finger, impact test), and tables for classification and temperature limits to guide conformity testing.

Practical Applications and Users

Who uses IEC 61558-2-7:2023:

• Manufacturers of toy transformers and toy power supply units (design and production)
• Product safety and compliance engineers preparing technical files and declarations of conformity
• Test laboratories and certification bodies performing safety testing
• Regulatory authorities and market surveillance bodies assessing product safety
• Component suppliers specifying parts compatible with toy safety limits

Benefits:

• Ensures safe low‑voltage supplies for toys and reduces electric/thermal/mechanical hazards
• Helps meet international compliance and supports market access

Related Standards

• IEC 61558-1:2017 (general requirements and tests for transformers and power supplies)
• IEC Guide 104 (group safety publications)
• Standards referenced for protective functions and SELV: IEC 61140, IEC 60364‑4‑41, IEC 60204‑1

For design or compliance work involving toy power supplies, IEC 61558-2-7:2023 is the reference for particular safety requirements and test methods tailored to toy applications.