SDC 1576U EMLOCK 12/24 VDC Magnetic Strike

SDC 1576U EMLOCK Magnetic Strike

The SDC 1576U is a 630-pound holding-force magnetic strike designed for professional access control deployments requiring wired integration with readers and control panels. Operating on 12/24 VDC, the 1576U pairs with OSDP-capable systems, proximity readers, NFC/13.56 MHz credentials, and integrated keypads — making it suitable for both single-door and multi-door installations where credential flexibility and reliable strike retention are non-negotiable.

Key Features

• 630-Pound Holding Force: Delivers consistent electromagnetic retention across standard door frames; sufficient for most commercial and institutional single-point egress locks. This is not a fail-safe design — power loss releases the strike, which is intentional for emergency egress compliance.
• 12/24 VDC Operation: Dual voltage input eliminates the need to stock two part numbers across different facility zones. Verify your control panel outputs before wiring; mismatched voltage will damage the coil.
• OSDP Protocol Support: Integrates natively with access control systems using the Open Supervised Device Protocol — no gateway or translator required. This means real-time lock status feedback and credential updates without polling delays.
• NFC / 13.56 MHz Credential Compatibility: Works with standard proximity card readers and mobile wallet NFC credentials. No proprietary reader needed — reduces inventory burden and simplifies credential issuance across your facility.
• Integrated Keypad Input: Allows PIN-based unlock as a secondary credential method without a separate reader installation. Useful for backup access or zones where card readers are impractical.
• Wired Integration: All connectivity is hardwired — no wireless mesh dependencies or battery management. Power and control lines run via conduit; ensure proper strain relief at the door frame and panel termination to prevent intermittent failures under vibration or physical stress.

Integration & Compatibility

The 1576U connects to access control systems and readers communicating via OSDP. Confirm your panel, reader, and keypad all support OSDP before specifying this strike. Standard door frame mounting (mortise or surface installation) accepts the unit in typical commercial and institutional environments. Request the datasheet PDF directly from the manufacturer to verify exact mounting dimensions and wiring termination schemes for your specific frame type.

When evaluating magnetic strikes for multi-door systems, confirm total coil current draw against your control panel's available power budget. Some panels limit strike current per zone to prevent brownouts during simultaneous unlock events across doors. The 1576U's wattage and inrush current must be evaluated in the context of your complete credential and control topology.

Frequently Asked Questions

Q: Is the SDC 1576U fail-safe or fail-secure?

A: The 1576U is fail-safe — power loss releases the strike, allowing emergency egress. If you require fail-secure (lock remains engaged during power loss), a different strike architecture is needed; consult your access control integrator.

Q: What's the maximum wire run distance from the control panel to the 1576U?

A: Consult the datasheet for voltage drop specifications. Longer runs (over 100 feet) may require heavier gauge wire to avoid coil under-voltage and intermittent unlocking. AWG calculation depends on total current draw and acceptable voltage loss.

Q: Can I use a standard 12VDC power supply instead of the control panel's built-in output?

A: Yes, but the supply must be OSDP-capable or connected through a dedicated relay circuit to allow command feedback. Direct wiring bypasses lock status reporting, reducing visibility into physical security events.

Q: Does the 1576U work with wireless readers or cloud-based access control?

A: The strike itself is wired. It integrates with wireless readers and cloud panels only if those systems support OSDP and have hardwired connections back to the panel controlling the strike coil. Wireless credential handoff to wired strike activation requires middleware or a hybrid reader setup.

Q: What mounting options are available?

A: Standard mortise and surface-mount configurations for commercial door frames. Exact mounting bracket and template details are in the manufacturer's datasheet; frame material (wood, aluminum, steel) affects installation difficulty and long-term reliability under repeated use.

Ted Perry

Perspective based on aggregated IP Security Depot and affiliated engineering team experience.

The SDC 1576U is a solid fit for facilities standardizing on OSDP-based access control, but the architecture imposes real constraints. Its 630-pound holding force is adequate for single-point egress, but it's not a heavy-duty solution for high-traffic public entries or environments prone to tailgating attempts. The 1576U requires hardwired control panel integration — no workarounds for retrofits into wireless-only systems without adding intermediate relays and power distribution.

Technical Highlights:

• Dual 12/24 VDC Input: Eliminates voltage mismatch errors across facilities with mixed panel types, but requires field verification before commissioning. Wrong voltage will fail the coil silently under load.
• OSDP Native Support: Real-time strike status and credential synchronization without polling. Integrates cleanly into modern access control panels with native OSDP stacks — no gateway overhead or latency penalties.
• NFC 13.56 MHz Credential Path: Standard proximity and mobile wallet credentials reduce credential management overhead compared to proprietary reader ecosystems. Verify reader firmware supports the credential type before deployment.

Deployment Considerations:

• Fail-safe design mandates that emergency egress systems account for strike release during power loss. Pair the 1576U with UPS-backed panels if fail-secure behavior is required during outages.
• Inrush current on energization can exceed sustained coil current significantly — confirm your panel's relay or MOSFET can handle the transient without nuisance trips on adjacent circuits.

The 1576U is the right choice for modernized office and institutional deployments where OSDP is already standard and NFC credential flexibility is valued. Avoid it in high-security or high-traffic scenarios demanding fail-secure operation or redundant strike architectures.