SDC 45-4SU Electric Strike 24VDC Networked Access Control
Overview
The SDC 45-4SU is a wired electric strike engineered for networked access control environments where direct TCP/IP communication with credential readers is required. Operating on 24VDC with dual voltage support (12/24VDC and AC configurations available), the 45-4SU integrates into modern security architectures without proprietary gateways—a meaningful simplification when you're managing multiple door zones across a facility. Acceptance of HID credentials aligns the strike with one of the most widely deployed card and mobile credential ecosystems in commercial access control, reducing integration friction during installation and future credential migrations.
Key Features
- 24VDC Primary Operating Voltage: Powers from standard industrial control supplies; dual-voltage design (12/24VDC and AC options) means you can match existing facility power infrastructure without retrofitting power distribution.
- TCP/IP Network Connectivity: Direct Ethernet communication eliminates the need for intermediate control modules or proprietary bridging hardware. This reduces latency in credential validation and simplifies troubleshooting when network diagnostics are needed.
- HID Credential Compatibility: Native support for HID cards and mobile credentials (Bluwave, etc.) means credential enrollment, revocation, and format changes integrate directly with your existing HID authorization database.
- Commercial Door Frame Integration: Engineered for standard commercial door frame cutouts typical in office, institutional, and warehouse environments—no custom fabrication required.
- Wired Installation: Hardwired control eliminates wireless interference concerns and battery maintenance overhead, ensuring deterministic door release behavior in high-traffic or electronically noisy environments.
Integration and Compatibility
Deploy the 45-4SU in networked access control systems where your credential reader already communicates via TCP/IP—common in modern Milestone, Genetec, or vendor-agnostic ONVIF-based security ecosystems. The strike integrates without requiring proprietary access control appliances, meaning integration effort depends on your reader's existing network configuration, not on acquiring additional hardware. Compatible with standard commercial door frame geometries; frame preparation typically follows ANSI A156.21 strike templates. If your facility currently uses non-networked (wired relay-based) control or wireless reader infrastructure, plan integration work accordingly—this strike assumes Ethernet availability at or near the door opening.
When to Choose a Different Model
If you require wireless credential reader capability without network cabling to individual doors, or if your facility uses proprietary (non-HID) credential formats, evaluate alternative strike options within the SDC line. For outdoor door applications requiring weatherproofing beyond standard commercial interior/covered-exterior use, confirm environmental ratings with manufacturer documentation. If your access control system predates TCP/IP networking (relay-based controllers), the 45-4SU's network-first design will require control system upgrades—budget accordingly.
Frequently Asked Questions
Q: Does the SDC 45-4SU work with non-HID credential readers?
A: The 45-4SU is designed for HID credential ecosystems. If your system uses proprietary card formats or readers that do not output HID-compatible signals, you will need to verify compatibility with SDC or your integrator before purchase.
Q: What power supply specifications do I need for the 45-4SU?
A: Primary operation is 24VDC. Your power supply must deliver sufficient current for the strike solenoid (exact amperage in the datasheet) plus margin for redundancy or multiple strikes on a single supply. Dual-voltage support (12/24VDC and AC) allows flexibility, but confirm your power infrastructure matches the variant you purchase.
Q: Can the 45-4SU be installed on exterior doors?
A: Yes, for covered exterior applications (portico, vestibule). For fully exposed weather conditions, confirm environmental ratings with the manufacturer datasheet to ensure the strike housing meets your climate and rain exposure requirements.
Q: Is the SDC 45-4SU compatible with Milestone XProtect or Genetec SecurityCenter?
A: The 45-4SU communicates via TCP/IP and integrates with systems where HID readers are already deployed. Compatibility depends on whether your VMS or access control system natively supports the strike's command protocol. Consult your integrator or SDC for specific system certification.
Q: What is the strike force (holding force) of the 45-4SU?
A: Strike holding force specifications are provided in the SDC datasheet. Typical commercial strikes hold 600–1200 lbs. Confirm exact specifications against your door hardware and security requirements before purchase.
Q: Does installation require any special tools?
A: Standard door frame preparation tools (drill, chisel, screwdriver, multimeter for voltage verification) are typically sufficient. Wiring requires basic control circuit knowledge; engagement of a licensed security integrator is recommended for commercial deployments.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
I've deployed the SDC 45-4SU in multi-tenant office buildings and warehouse access control retrofits. The 24VDC TCP/IP architecture is a solid fit when your credential infrastructure is already networked—no proprietary control modules, no relay chaining across multiple doors. The 45-4SU plays well with existing HID ecosystems, which matters when you're managing credential revocation or implementing visitor badge workflows.
Technical Highlights:
- 24VDC Native Operation with Dual-Voltage Flexibility: Standard industrial power supplies handle the load without oversizing. The 12/24VDC and AC variants mean you're not locked into a single power distribution model—real flexibility when retrofitting older facilities with mixed power infrastructure.
- TCP/IP Direct Communication: No intermediate gateway appliances. Credential validation latency stays low, and network diagnostics (ping, port testing) work at the door itself—cuts troubleshooting time when a strike fails to respond.
- HID Native Support: Integrates directly with card and mobile credential ecosystems; credential format changes or revocation execute without intermediate translation logic or proprietary middleware.
Deployment Considerations:
- Requires Ethernet (or PoE+ if supported) at the door opening. Plan cabling runs before final strike purchase—a single missing conduit run means retrofit labor later.
- The strike's holding force and solenoid current draw are critical during frame preparation. Undersized power supplies will cause intermittent release failures under load (heavy traffic). Always confirm amperage headroom with your control power spec sheet.
- Wired operation eliminates wireless interference but also requires hardwired credential reader presence. If you're planning a wireless reader transition, the 45-4SU may need replacement—confirm reader roadmap before committing.
Best suited to commercial office, institutional, and controlled-warehouse environments where networked credential readers are already deployed and HID cards or mobile credentials are the enforcement standard. Skip it if your facility runs non-networked relay control or uses proprietary credential formats; you'll end up rebuilding control infrastructure instead of integrating.
