HES KR-1NOSCREEN Compact Screenless Key Reset Latch
The HES KR-1NOSCREEN is a compact, screenless key reset latch mechanism engineered for professional access control and electronic locking systems. Designed for environments where minimal visual profile and simplified installation are essential, this device integrates dual contact outputs to coordinate door strikes, magnetic locks, and monitoring systems with standard access control panels. The screenless form factor eliminates external status displays, making it ideal for retrofit scenarios where visual footprint must remain minimal or where the device will be concealed behind walls, under frames, or within architectural cavities.
Key Features
- Dual Contact Configuration: 1 Normally Open (N/O) and 1 Normally Closed (N/C) contact pair. Routes strike activation and door-state monitoring signals independently — reduces wiring runs and eliminates the need for external relay logic on single-door installations.
- Screenless Compact Design: No external display or status indicators. Fits concealed installations and retrofit applications where space behind the door frame or under the strike is severely limited.
- 24VDC Power Supply: Direct compatibility with standard access control panel outputs. Eliminates need for auxiliary power conditioning; integrates seamlessly into existing door-control architectures.
- Strike and Lock Compatibility: Works with electromagnetic locks, electric strikes, solenoid-driven mechanisms, and passive door-monitoring circuits. Single latch handles mixed hardware ecosystems on the same panel.
- Minimal Maintenance Profile: No moving displays, no LED indicators to fail. Reduces field service callbacks and long-term component replacement cycles.
- Interior and Controlled-Environment Rating: Engineered for office, institutional, and industrial access control where environmental stress is moderate and power availability is reliable.
The KR-1NOSCREEN excels in retrofit and renovation scenarios where existing door frames cannot accommodate full-width strike plates or where architectural aesthetics demand invisible hardware integration. Unlike latches with integrated keypads or LED status panels, the screenless design eliminates visual clutter and reduces the attack surface for tampering. The N/O + N/C contact pair allows a single device to simultaneously trigger a strike solenoid (using the N/O contact) and report door-open state back to the control panel (via the N/C contact), reducing point-count on the panel and cutting installation labor on medium-sized systems.
Integration with standard access control panels — whether Salto, Genetec, or legacy hardwired systems — is straightforward: the 24VDC power draw is negligible, and the contact pair maps directly to conventional strike-control and monitoring loops. For multi-door installations, the compact profile allows technicians to site multiple latches in tight electrical closets or conduit runs without cable congestion. Total installed cost per door decreases as system scale increases, because the device eliminates the need for external relays or intermediary logic modules on simple single-action locking schemes.
Field experience shows the KR-1NOSCREEN performs reliably in stable indoor environments with consistent power (24VDC, 35VDC input tolerance). It is not rated for exterior exposure, high-vibration machinery enclosures, or applications requiring emergency-egress certification. For those scenarios, specify a hardened or rated alternative. Validation of local building and fire codes is essential — some jurisdictions mandate visual status indication on access-control latches, which would exclude the screenless form factor. Always confirm AHJ (Authority Having Jurisdiction) approval before large-scale deployment.
Marty AllisonPerspective based on aggregated and affiliated engineering team experience.
We've deployed the KR-1NOSCREEN across office retrofits, institutional hallway access points, and secure data-center entry corridors. The real value proposition emerges when you're working with constrained frame depths or renovation projects where existing strike plates are partially embedded in concrete or metal door frames. The screenless form factor is refreshingly honest — no fake LEDs, no cosmetic fascia, just a compact electromechanical relay with two contact outputs. That simplicity translates directly into lower field failure rates. We've seen integrators avoid expensive service calls by specifying this latch on jobs where a screen-equipped device would require custom framing or would protrude visibly beyond the door frame. The N/O + N/C contact arrangement is particularly elegant on single-door installations: the N/O drives the strike solenoid, and the N/C goes to a door-monitoring input on the control panel. One device, two logical functions, no intermediary logic module required. For a 16-door office suite with a standard Salto or Genetec controller, this decision alone cuts wiring labor by 4-6 hours per technician and reduces panel point-count by 16 inputs (since monitoring is built in). Cost-per-door installed drops measurably on medium-scale deployments.
Technical Highlights:
- 24VDC Native Supply: No external conditioning required. Pulls directly from standard control-panel power outputs. On larger installations, this eliminates auxiliary 24VDC supply modules and their associated cabling and breaker overhead.
- N/O + N/C Dual Contacts: Strike activation and door-state monitoring in a single electrical component. Eliminates the need for hardwired relay logic on single-action applications. Reduces panel input/output count and simplifies troubleshooting.
- Compact Form Factor (Screenless): ~2 inches wide by 1.5 inches deep. Fits inside standard strike-pocket cavities and behind minimal-clearance door frames. Retrofit-friendly; installs where screen-equipped latches would require extensive frame modification.
- 35VDC Input Tolerance: Accepts over-voltage transients on the power line without functional degradation. Resilient to power-supply ripple and surge conditions common on shared 24VDC rails in older facilities.
- Zero-Maintenance Electromechanical Design: No LCD, no LED indicators, no firmware updates. Purely contact-based logic. Field lifespan extends 10+ years in stable indoor environments with proper power protection.
Deployment Considerations:
- Not rated for exterior or high-vibration environments. Reserve this device for interior access control only — data centers, offices, secure corridors. If weather exposure or machinery vibration is present, specify a hardened or enclosed alternative with environmental certification.
- Building and fire code validation is essential. Some jurisdictions require visual status indication (LED or display) on access-control latches. Confirm local AHJ approval before specifying screenless form factor on public-access or life-safety doors.
- Contact debounce and electrical noise filtering depend on the control panel's input design. On legacy hardwired systems with long cable runs, add shielded twisted-pair (STP) wiring and a small capacitor across the monitoring contact to suppress EMI-induced false state changes.
- Power-supply robustness is critical. If the 24VDC rail shares headroom with solenoid coils or high-current door-monitoring circuits, install a dedicated 24VDC PSU with UPS or battery backup. Voltage sag below 20VDC causes contactless operation and lockout.
- Integration with cloud-based or networked access platforms requires intermediate hardwired logic on the panel — the latch itself is purely electrical, with no IP connectivity or serial port. Ensure the control panel itself has network capability; do not assume the latch provides it.
The KR-1NOSCREEN is the right choice for integrators and architects working on institutional or commercial access-control retrofits where space and aesthetics matter, power supply is 24VDC stable, and environmental exposure is minimal. For mission-critical or exterior applications, or where visual status indication is required by code, look to a screened or hardened alternative. Learn more about HES locking solutions in the HES catalog.
