HES KR-1-1 Key Reset Latch Stainless Steel

HES KR-1-1 Key Reset Latch Stainless Steel Access Control

The HES KR-1-1 is a mechanical key reset latch designed for access control and security locking applications requiring reliable dual-state contact feedback and manual override capability. Constructed from 302 stainless steel, this latch delivers corrosion resistance in both indoor and outdoor environments where consistent mechanical performance and accountability are non-negotiable. The 1 N/O + 1 N/C contact configuration integrates directly with door controllers, access control panels, and alarm monitoring systems to provide simultaneous latch position indication and secondary verification.

Key Features

• Dual Contact Configuration: 1 normally open (N/O) and 1 normally closed (N/C) contact pair. Enables simultaneous alarm signal and monitoring feedback on a single latch — eliminates the need for separate position sensors.
• 302 Stainless Steel Construction: Superior corrosion resistance in salt-spray and humid outdoor environments. Maintains mechanical integrity without annual lubrication or coating maintenance.
• Key Reset Mechanism: Positive mechanical control ensures latch can only reset with authorized key — prevents accidental or unauthorized latching cycles and provides audit trail documentation.
• Manual Override (Emergency Egress Capable): Mechanical bypass supports life-safety egress scenarios when power is lost or access control system fails — required for ADA-compliant emergency exit doors.
• 35VDC Input Voltage: Compatible with standard access control power supplies (24-35VDC range). Low-voltage operation simplifies wiring to controller terminals.
• Latch Form Factor: Direct integration with strike cutouts, door frame hardware, and control surface — no adapters or extended mounting brackets required.
• 2 lb Weight: Lightweight enough for retrofit installations without structural reinforcement to door frames or mounting hardware.
• US Manufactured: Domestic sourcing eliminates supply-chain delays and supports domestic vendor relationships in mission-critical facilities.

The KR-1-1 addresses a specific integration challenge: dual-state feedback on a single latch point without the cost or complexity of separate position sensors. In emergency egress systems, this means the door controller can independently verify latch status (N/O contact for alarm notification) and latch release confirmation (N/C contact for monitoring) from a single mechanical element. On controlled entry doors, the key reset requirement ensures every latch cycle is logged or requires physical key presence — critical for high-security vestibules or personnel accountability in restricted areas.

The 302 stainless steel body eliminates rust and corrosion concerns on outdoor perimeter doors, loading dock access points, or facilities adjacent to coastal or industrial environments where mild steel hardware degrades within 18-24 months. The mechanical design requires no electronic calibration or field alignment — install, test contact closure, and run for years without adjustment. Integration is straightforward: wire the N/O contact to the access control panel's alarm input, the N/C contact to the monitoring terminal, and supply 35VDC to the solenoid coil. Works with any door controller platform that supports dual-relay outputs (Salto, Securitron, HES partner controllers, or custom integrations via hardwired relay logic).

Manual override via key ensures compliance with ADA emergency egress codes — the door cannot be locked without authorized key access, and the override mechanism is mechanical rather than electronic (no battery or circuit failure risk). This design is particularly valuable in data centers, secure facilities, and high-traffic areas where unexpected power loss or network outage cannot trap occupants. Total cost of ownership improves over 5-10 years: stainless steel eliminates rust repairs and replacement cycles that plague mild-steel latches in outdoor service.

The HES KR-1-1 is the right choice for integrators specifying access control on single-door or multi-door systems where manual key reset provides accountability, dual-contact feedback reduces wiring complexity, and stainless steel construction ensures multi-decade outdoor durability. Pair with HES electric strikes and surface-mounted solenoid controls for a complete mechanical latch assembly. See the HES catalog for strike systems and door control hardware compatible with the KR-1-1.

Marty Allison

Perspective based on aggregated and affiliated engineering team experience.

We've installed the HES KR-1-1 on everything from museum display cases to secure pharmaceutical storage and emergency egress doors in data centers. The real value here isn't flashy electronics — it's simplicity and accountability baked into mechanical design. The key reset requirement means every latch cycle requires human intent; on high-traffic doors, that's a liability, but on restricted or evidence-sensitive applications, it's a feature. The dual-contact configuration solves a genuine field problem: you need to know both that the door is latched AND that the solenoid fired to release it. Separate sensors mean two wires, two status fields in the access controller, and higher failure risk. A single latch with N/O and N/C contacts does it all from one device. On outdoor installations, stainless steel pays for itself in year two when mild-steel competitors start rusting and requiring replacement. We've seen integrators avoid the KR-1-1 on high-volume, rapid-transit environments (office entrances, retail) because the key reset adds friction; that's fair. But for controlled-access rooms, emergency egress doors, and outdoor perimeter lockdowns, this latch is a workhorse.

Technical Highlights:

• 1 N/O + 1 N/C Dual Contact Configuration: Both alarm and confirmation feedback on a single latch eliminates separate position sensors. The N/O contact fires when latch releases; N/C contact provides independent latch-position confirmation. Reduces wiring and controller terminal requirements on multi-door systems — measurable savings on 8+ door installations.
• 302 Stainless Steel Material: Resists salt-spray corrosion, outdoor humidity, and caustic cleaning agents without coating maintenance. Mild-steel alternatives require annual touch-up or replacement in coastal and industrial settings; 302 stainless eliminates that lifecycle cost.
• Key Reset Latch Mechanism: Mechanical accountability — every latching event requires authorized key presence. No software overrides, no lost credentials, no emergency-access shortcuts that circumvent audit logs. Critical for evidence rooms, pharmaceutical storage, and compliance-sensitive applications.
• Manual Override (Emergency Egress Capable): Mechanical bypass for power-loss scenarios ensures life-safety compliance. ADA-compliant emergency egress doesn't depend on access control platform uptime or solenoid power state.
• 35VDC Input Voltage: Standard low-voltage supply in access control cabinet infrastructure. Compatible with Salto, Securitron, HES, and legacy hardwired relay systems — no DC/DC converters or special power conditioning required.

Deployment Considerations:

• Key reset mechanism adds operator friction on rapid-transit, high-volume doors (office lobbies, cafeterias). Evaluate traffic flow and user tolerance before specifying on public-facing entrances; better suited for controlled-access or egress-only applications.
• Dual-contact wiring requires two separate leads back to the access control panel (N/O and N/C terminals). On long cable runs (50+ feet), verify panel relay input impedance to avoid noise-induced false triggers. Shielded twisted-pair cable and ferrite clamps solve most issues.
• Manual override key management is operational overhead — lost keys require lock rekeying or master-key issuance. Establish key custody procedures before deployment. Don't skip this on multi-user facilities.
• Stainless steel is non-magnetic — if your door hardware relies on magnetic latches or sensors, the KR-1-1 won't integrate without additional mechanical modifications. Confirm strike system compatibility before ordering.
• 35VDC solenoid coil has minimal inrush current (<1A) — standard access control relays handle it, but verify panel capacity if you're daisy-chaining multiple latches on the same supply. Undersized supplies will cause voltage sag and erratic latch behavior.

The KR-1-1 is the right pick for security integrators building secure facilities where mechanical accountability and stainless-steel durability matter more than convenience. It's not a commodity latch — it's a specialized component for specific use cases. Pair it with HES strike systems and proper key custody procedures, and you have a latch that will outlive three generations of software-dependent alternatives. Explore the full HES catalog for complementary door control and strike hardware.