SDC CR4 Station Door Control Relay Board, (4) N/O, Dry Inputs, (4) SPDT, Fused, Wet or Dry and (4) SPDT, Unfused, Wet or Dry Outputs

Deliver reliable, scalable door control where security and uptime matter. The Security Door Controls CR4 station relay board is a compact control panel module built to simplify access control, monitoring and surveillance integration for up to four separate doors. Designed for installers and security managers, the CR4 accepts dry (NO) trigger inputs and provides one fused 2A SPDT output (jumper-selectable wet or dry) and one non-fused 2A SPDT auxiliary output per station, operating on 12 or 24VDC. Isolated relays allow small-gauge 20 AWG cable runs up to 1,000 feet from the trigger device, reducing conduit and labor costs while maintaining reliable signaling. Individual fusing safeguards each lock circuit, minimizing service interruptions and protecting power supplies. Bright LEDs simplify commissioning and field diagnostics, accelerating troubleshooting for busy security teams. Backed by a 5-year warranty, the SDC CR4 relay board integrates seamlessly with 600-series power supplies and common access control hardware to support mantraps, multi-door interlocks, and enterprise monitoring systems. Add the CR4 to your next access control design to streamline wiring, improve system resilience, and speed installation.

• Simplifies installation and troubleshooting for multi-door systems by providing centralized relay control for up to four doors
• Individual 2A fused outputs protect each lock circuit and reduce downtime from wiring faults
• Isolated relay design supports long runs (20 AWG up to 1,000 ft) for flexible hardware placement
• Jumper-selectable wet or dry fused outputs plus non-fused SPDT auxiliary outputs for flexible integration with access control, alarms, or mantraps
• LED status indicators give instant visual confirmation for faster field diagnostics and monitoring