SDC 1571VD Single Electromagnetic Lock 1200LB
Overview
The SDC 1571VD is a wired electromagnetic strike rated for 1200 pounds of holding force, designed to integrate directly into enterprise access control systems via OSDP (Open Supervised Device Protocol) communication. Unlike mechanical locks, this electromagnetic strike eliminates the need for physical key management and provides remote release capability integrated with your access control panel—critical for multi-door environments where credential revocation and audit trails matter. The 1571VD supports up to 250,000 user credentials and manages access across up to 10 doors in a single deployment, reducing the complexity and cost of managing separate lock systems.
Key Features
- 1200 LB Holding Force: Sufficient for standard commercial and warehouse door installations. At 1200 pounds, this handles typical personnel access doors; if you're securing high-security vaults or need fail-safe (locked when power lost) operation, confirm this holding force meets your door weight and swing specifications before purchase.
- 24VDC Power Requirement: Operates on standard 24-volt DC, compatible with most commercial power supplies and UPS backup systems already deployed in security installations. Draws minimal current, reducing load on facility power infrastructure compared to solenoid-based alternatives.
- OSDP Communication Protocol: Encrypted credential transmission and real-time event reporting to your host access control panel. OSDP is vendor-neutral and widely supported across enterprise access control platforms, reducing vendor lock-in and simplifying system upgrades.
- Multi-Credential Format Support: Accepts DESFire, MIFARE Classic, NFC/13.56MHz, and 125kHz proximity cards. This flexibility allows mixed credential deployments—for example, existing 125kHz proximity card infrastructure can coexist with newer NFC mobile credentials without requiring complete credential replacement.
- Multiple Reader Options: Works with proximity sensors and integrated keypad input. Proximity readers provide contactless operation (valuable in high-touch environments); keypad input supports PIN-based or hybrid multi-factor authentication scenarios.
- Up to 250,000 User Credentials: Capacity sufficient for large enterprise deployments with multiple facility locations and frequent credential rotation. Audit trails and revocation are managed centrally through your access control system, not locally on the device.
Integration & Compatibility
The 1571VD integrates via wired OSDP, meaning it requires a dedicated control line (RS-485 or equivalent) back to your access control panel. This differs from wireless locks and eliminates RF interference concerns, but requires conduit planning during installation. Pair this strike with access control panels that support OSDP output; verify panel compatibility before specifying. Power supply sizing is straightforward—confirm your UPS can supply 24VDC backup for the duration of your site's power-loss protocol (typically 4–8 hours for critical access points).
For multi-door deployments, the 1571VD's ability to manage up to 10 doors through a single control line reduces overall panel load and simplifies credential administration. If you're integrating with existing security integration systems, verify that your panel firmware supports OSDP and that your integrator has tested credential formats (DESFire vs. MIFARE vs. proximity) with your chosen readers.
When to Choose a Different Model
If your application requires fail-safe operation (lock remains secure when power is lost), consult SDC's fail-safe variants. If wireless communication is mandatory due to conduit constraints, electromagnetic strikes with wireless modules may be necessary—though these introduce RF site survey and interference mitigation overhead. For outdoor door applications exposed to weather, confirm that your chosen strike has appropriate environmental sealing; the 1571VD is designed for indoor environments in standard commercial and warehouse settings.
Frequently Asked Questions
Q: Does the 1571VD support fail-secure operation?
A: The 1571VD is a fail-safe strike—it releases (unlocks) when power is lost. If you require fail-secure operation (lock remains locked when power is lost), you will need a different strike model equipped with permanent magnets or mechanical latching.
Q: What access control panels is the 1571VD compatible with?
A: The 1571VD communicates via OSDP, which is an open protocol. It is compatible with any access control panel that supports OSDP output—this includes Honeywell, Tyco, Salto, Gallagher, and other enterprise platforms. Verify your specific panel model supports OSDP before specifying.
Q: Can I use the 1571VD outdoors?
A: The 1571VD is designed for indoor deployment in standard commercial and warehouse environments. Outdoor installations require environmental sealing and weatherproofing. Consult the datasheet or an integrator for outdoor-rated alternatives.
Q: What is the holding force and is 1200 LB adequate for my door?
A: The 1571VD provides 1200 pounds of holding force. This is suitable for typical personnel access doors (20–40 lbs). For heavier doors or high-traffic loading, calculate the actual force required based on door weight, swing speed, and usage frequency—consult your integrator if uncertain.
Q: Does the 1571VD require a power supply backup, and what's the recommended UPS capacity?
A: Yes. The 1571VD draws minimal current at 24VDC, but backup power is recommended to maintain access during mains failure. Size your UPS to supply the 1571VD and control panel for the duration of your site's power-loss protocol (typically 4–8 hours). Consult your electrical engineer for final UPS sizing.
Q: Can I mix credential types (proximity cards and NFC) on the same 1571VD?
A: The 1571VD supports multiple credential formats (DESFire, MIFARE, NFC/13.56MHz, 125kHz proximity). However, the readers paired with the strike determine which format is presented. You can deploy mixed credentials across different doors or readers—each reader handles its native format.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The SDC 1571VD is a solid fit for enterprise multi-door access control where OSDP integration is available and fail-safe operation (unlock on power loss) is acceptable. The 1200-pound holding force and support for 250,000 user credentials make it a reasonable choice for mid-to-large warehouse and commercial facility rollouts. The real strength here is the OSDP protocol—it guarantees encrypted communication and event reporting without vendor-specific proprietary integrations.
Technical Highlights:
- 1200 LB Holding Force: Adequate for standard personnel doors and light-duty warehouse access; confirm door weight and swing force requirements before commitment, as oversized or high-traffic doors may exceed this rating.
- 24VDC Power at Minimal Draw: Integrates cleanly with standard commercial power supplies and UPS infrastructure; minimal impact on panel power budgets, important in multi-strike deployments.
- Multi-Credential Support (DESFire, MIFARE, NFC, 125kHz): Flexibility to migrate from legacy 125kHz proximity cards to NFC without full credential replacement—valuable for phased deployments across large facilities.
- OSDP Encrypted Communication: Ensures credentials cannot be intercepted in transit; real-time event logging supports audit compliance (SOX, HIPAA, PCI-DSS) without reliance on proprietary panel logging.
Deployment Considerations:
- Wired OSDP Requirement: Requires dedicated control line (RS-485) back to your panel—plan conduit during construction. No wireless option; verify your panel has available OSDP output ports before specifying across multiple doors.
- Fail-Safe Behavior: This strike is fail-safe (unlocks on power loss), not fail-secure. For high-security applications requiring locked doors on power loss, you need a different strike with permanent magnets or manual override—this is not negotiable and a common mistake in specification.
- UPS Backup Planning: Backup power is recommended but not built-in. Account for 24VDC UPS sizing in your facility power plan; 4–8 hours is standard for critical access points.
Best suited for warehouse distribution centers, commercial office buildings, and mid-sized institutional facilities where credential centralization and OSDP audit trails justify wired integration. Not recommended for outdoor entry points, fail-secure scenarios, or sites without OSDP-capable control panels.
