Overview
IEC TS 63236-3:2021 is a Technical Specification from the IEC that defines additional requirements for AC/DC appliance inlets used with information and communication technology (ICT) equipment installed in data centres and telecom central offices. It is intended to be used together with IEC TS 63236-1:2021 and covers appliance inlets that are suitable for both alternating current and direct current supply (so-called hybrid appliance inlets).
Key factual limits in the specification:
- Intended ambient temperature range: -5 °C to +60 °C
- Protection class: Class I equipment
- Not a substitute for plug-and-socket standards (see Related Standards)
Key Topics and Requirements
- Hybrid appliance inlet definition: an inlet designed to mate with IEC 60320-3 (AC) and IEC TS 63236-1 (DC) standardized connectors.
- Standard ratings (hybrid inlet):
- Direct current: 294 V DC to 400 V DC, max 2 600 W
- Alternating current: 10 A, 250 V AC
- Marking and labelling: separate, clear markings required for DC (voltage and max power) and AC (current and voltage); AC symbol “AC” or “~” added.
- Dimensions and compatibility: hybrid appliance inlets shall comply with the specified standard sheet (Figure D.1 / Annex D), including gauges and mating criteria.
- Safety and construction: requirements on protection against electric shock, earthing provisions, terminals/terminations, insulation resistance and electric strength, and resistance to heating, heat ageing and mechanical stresses.
- Testing and conformity: includes general test notes, normative routine tests (Annex A), test schedules (Annex B), and standard gauges (Annex D). EMC and temperature-rise considerations are included.
- Restrictions: not suitable for replacing plug/socket systems per IEC TS 62735, IEC 60884 series, or luminaire couplers (IEC 61995).
Practical Applications and Users
Who uses this TS:
- ICT equipment designers and manufacturers creating power inlets for servers, network racks and telecom equipment
- Data centre and telecom facility engineers specifying inlet compatibility for mixed AC/DC power distribution
- Test laboratories and conformity assessors executing mechanical, electrical and safety tests
- Procurement and compliance teams ensuring equipment meets hybrid AC/DC inlet requirements
Why it matters:
- Ensures safe, interoperable AC/DC inlet designs for mixed power environments
- Standardized markings, ratings and dimensions reduce installation errors and improve maintainability in critical ICT environments
Related Standards
- IEC TS 63236-1:2021 (Part 1 - general DC appliance coupler requirements)
- IEC 60320-3 (AC connector compatibility)
- IEC TS 62735 series, IEC 60884 series, IEC 61995 (listed as standards for which these inlets are NOT a substitute)