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Technical Reference

Locking Power Cords Reference

Six locking systems compared: how each mechanism works, pull-out force ratings, PDU compatibility, and guidance on which to choose for your infrastructure.

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Why locking cords matter

Accidental cord disconnection is one of the most common causes of data center downtime — and one of the easiest to prevent. Locking connectors require a deliberate action to disconnect, eliminating the risk from cord pulls during maintenance, cable management work, or equipment relocation.

A standard IEC C13 connector has a pull-out force of approximately 10–20N. The locking systems below range from 120N to 200N+ — 10 to 20 times more resistant to accidental disconnection.

  • 1,020
    Standard C13/C14 pull force
  • 120,200
    Locking connector pull force
  • $515
    Premium per locking cord vs. standard

Locking systems compared

Pull-out force ratings, available connectors and plugs, compatible PDUs, and selection notes for each of the six IEC 60320 locking systems.

SystemPull forceConnectorsPlugsMechanismCompatible PDUsNotes
P-Lock120N+C13, C15, C19C14, C20Spring-loaded tabs on the connector body. Pinch both tabs simultaneously to release. Backward compatible — P-Lock connectors fit standard inlets.Server Technology, Raritan, Vertiv, Emerson, Tripp LiteThe most widely deployed locking system. Black and blue color options standard; custom colors available for cable management.
Z-Lock (Zonit)200N+C13, C15, C19C14, C20Quarter-turn rotary locking mechanism. Insert and turn clockwise to lock; turn counter-clockwise to release. Zonit microLock PDU technology.Zonit microLock PDUs and modules (requires Zonit-compatible outlets)Higher pull-out force than P-Lock. Requires Zonit-compatible PDU outlets — not backward compatible with standard C14/C20 inlets.
A-Lock (Auto-Lock)120N+C13, C15, C19C14, C20Red release tab integrated into the connector. Locks automatically on insertion; press red tab to release. Temperature-rated options to 120°C for C15/C16 applications.APC by Schneider Electric (Symmetra, Smart-UPS lines)APC proprietary system. Tool-required disconnect on some models. Best for APC-heavy data center environments. Available in C15 (120°C) for hot-aisle applications.
V-Lock200N+C13, C15, C19C14, C20Lever-operated locking mechanism on the connector body. Yellow color for visual identification. Press lever to release. Higher withdrawal force than tab-based systems.Raritan, Server Technology, and compatible with standard inletsYellow color coding makes cable pulls immediately visible during maintenance. Popular for high-uptime environments where accidental disconnection is catastrophic.
S-Lock (IEC-Lock)150N+C13, C19C14, C20Internal red ring mechanism that pinches the connector pins against the inlet contacts. Pull the red ring to release. Internal locking — no visible external tabs.Universal (fits any standard C14/C20 inlet)Cleaner appearance than tab-based systems. Backward compatible with all standard inlets. The red ring provides clear visual indication of the locked state.
D-Lock (Dual-Lock)150N+ (dual retention)C13, C19 (S-Lock connector)C14, C20 (P-Lock plug)Combines P-Lock plug on one end with S-Lock connector on the other. Both ends lock independently — the highest-security locking configuration available for IEC 60320.P-Lock plug end compatible with Server Technology, Raritan, VertivFor applications where both ends of the cord must be positively retained. Both ends lock on insertion. Recommended for mission-critical AI compute infrastructure.

Which system to choose

SituationRecommendedReason
Mixed PDU environmentP-LockBroadest compatibility. Works with any standard C14/C20 inlet and most PDU brands.
APC/Schneider Electric PDUsA-LockDesigned for APC inlets. Best integration with Schneider Electric infrastructure.
Hot aisle above 35°CA-Lock C15 or P-Lock C15C15/C16 variants available — 120°C rated for high-temperature environments.
Highest security (AI compute)D-LockBoth ends lock. 150N+ force on both the plug and connector. Maximum protection.
Zonit microLock PDUsZ-LockRequired for Zonit microLock ecosystem. Not compatible with standard inlets.
Visual cable managementV-Lock (yellow)Yellow color immediately identifies locked cords during maintenance.
Retrofitting existing cordsSecure SleevesRetrofit locking without replacing entire cord. Clamp-on mechanical retention.

Shop locking power cords

P-Lock, Z-Lock, A-Lock, and D-Lock — all in stock, same-day shipping.

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