SDC 1571V 1200LB Electromagnetic Lock
The SDC 1571V is a wired electromagnetic lock engineered for multi-door access control deployments requiring reliable 1200-pound holding force. Operating across 12/24VDC supplies, it integrates with OSDP-enabled control systems and supports multiple credential types—DESFire, MIFARE, NFC (13.56 MHz), and 125 kHz proximity—making it suitable for mixed-credential environments where integrators need flexibility across reader technologies.
Key Features
- 1200 lb holding force: Sufficient for standard commercial doors and frame installations; verify door weight and frame condition against local fire code requirements, as some jurisdictions mandate fail-safe (unlocked on power loss) operation in certain applications.
- 12/24VDC dual-voltage design: Reduces power supply inventory and simplifies wiring in retrofit installations where voltage standards vary; confirm your control panel output before ordering to avoid supply mismatch.
- OSDP protocol support: Ensures compatibility with modern access control platforms (Salto, Tyco, Honeywell, and others running OSDP), avoiding the licensing and support friction of legacy Wiegand connections.
- Multi-credential support: Accepts DESFire, MIFARE, NFC, and 125 kHz proximity reader inputs on the same lock, eliminating the need for separate hardware when upgrading from legacy proximity-only sites to hybrid NFC/card deployments.
- Up to 10 doors per system: Allows a single control module to manage small-to-medium multi-door clusters (lobby entry, secure corridor, etc.); larger facilities require additional controllers or a networked VMS architecture.
- 250,000 user credentials maximum: Sufficient for enterprise campuses and multi-tenant buildings; credential databases exceeding this threshold require role-based pruning or archival strategies.
Integration & Compatibility
Wire the 1571V directly to an OSDP-capable reader or control panel. The 628 finish (stainless steel) resists corrosion in humid or salt-spray environments (though not full marine grade). Pair with compatible proximity, keypad, or NFC readers from vendors supporting OSDP or standard wiring protocols. For large installations, integrate with a networked access control system to centralize credential management and audit logging across multiple locks—a single lock does not provide multi-site failover or real-time threat response on its own.
When to Choose a Different Model
If your doors exceed 1200 lb or require higher holding force (e.g., emergency egress or high-traffic entries), evaluate higher-force variants within the SDC product family. If power loss must trigger a fail-safe (unlock) state rather than fail-secure, confirm the 1571V configuration with the manufacturer—some models require a relay or power monitoring module. For outdoor installations subject to heavy rain or submersion, verify IP rating of the specific model revision, as electromagnetic locks typically offer limited environmental sealing compared to access control readers themselves.
Frequently Asked Questions
Q: Does the SDC 1571V require a dedicated power supply, or can I run it from existing building power?
A: The 1571V draws power at 12 or 24VDC (configure one or the other at installation). You will need a regulated 12 or 24VDC power supply rated for the lock's current draw. Do not attempt to power it from AC mains directly.
Q: Is the 1571V fail-safe or fail-secure?
A: The standard 1571V is fail-secure (locks remain engaged if power is lost). If your installation requires fail-safe behavior (unlock on power loss), consult the manufacturer about relay or power-monitoring configurations.
Q: Can I integrate the 1571V with an existing Milestone XProtect or other VMS?
A: The 1571V itself is an access control lock and does not directly connect to video VMS platforms. However, if your access control system (running OSDP) is integrated with your VMS via a third-party middleware or your VMS's native OSDP plug-in, events from the 1571V can be correlated with video. Confirm OSDP support in your VMS before purchasing.
Q: What finish options are available for the SDC 1571V?
A: The standard offering is 628 (stainless steel). Confirm other finishes (630, 645, etc.) with your supplier, as availability varies by region.
Q: Does the 1571V support wireless or networked control, or is it wired-only?
A: The 1571V is a wired lock. It must be connected via hardwired control lines to a reader, keypad, or access panel. There is no built-in wireless or Ethernet—networking happens at the control panel level, not the lock.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The 1571V is a straightforward wired electromagnetic lock with solid 1200 lb holding force and OSDP protocol support—exactly what you need for integrating access control readers into a modern, standards-based system. The dual 12/24VDC input is practical for retrofits and mixed-voltage campuses, but don't mistake it for a plug-and-play device; you still need to size the power supply correctly and confirm fail-safe vs. fail-secure behavior before installation.
Technical Highlights:
- 1200 lb holding force: Adequate for standard commercial frame installations; verify against door weight and local egress codes, as some jurisdictions require fail-safe unlocking in stairwells or emergency exits.
- OSDP native support: Eliminates Wiegand translation issues and supports modern reader diversity (NFC, DESFire, proximity, keypad) without hardware multiplexing—a real advantage over older mag-lock designs.
- 250,000 credential capacity: Suitable for enterprise multi-building deployments; anything larger requires careful credential lifecycle management or integration with a central access management platform.
Deployment Considerations:
- The 1571V is wired-only; there is no built-in wireless or Ethernet. Networking occurs at the controller, not the lock itself—confirm your access control panel has OSDP output before ordering.
- Fail-secure is the default. If your code-mandated egress or emergency override requires fail-safe (unlock on power loss), you will need an external relay or power monitoring module—budget time and cost for that integration.
- Stainless steel finish (628) is standard. In salt-spray or fully outdoor exposed installations, confirm corrosion resistance limits with the manufacturer; electromagnetic locks are typically outdoor-rated to IP54 at best, not IP67.
Deploy the 1571V in medium-to-large office, institutional, or multi-tenant campuses where OSDP-based credential diversity and centralized audit logging matter. It is not a retail kiosk or small single-door lock—it is designed for integrators building access control systems that span multiple buildings and credential types.
