SDC GL260MRAH Mechanical Key Unlock Gate Lock
The SDC GL260MRAH is a failsecure electric gate lock designed for manual or automatic chain link, tubular steel, and wrought iron sliding or swinging gates. This unit bridges the operational gap between remote electric control for daily access and mechanical key override for emergency or power-loss scenarios. The 5/8" stainless-steel bolt retracts into a heavy-gauge weatherized steel housing sized for 3" fence posts and 2" gate posts. Failsecure operation—bolt remains retracted on power loss—prevents gates from locking down during outages, a critical safety requirement for perimeter installations. The independent mechanical mortise cylinder provides manual unlock without requiring system power or network connectivity.
Key Features
- Failsecure Electric Operation: 24VDC (or 12VDC) wired bolt control with power-loss default to unlocked. Ideal for perimeter gates where outage-induced lockdown creates safety and operational risk.
- Mechanical Key Override: Independent mortise cylinder allows emergency manual unlock independent of power or control system. No forced entry required during maintenance or power restoration.
- SPDT Monitoring Contacts: 10 Amps @ 30 VDC dry-contact outputs enable door-position and bolt-position status reporting to any standard access control or gate operator panel.
- Dual Voltage Selection: 12/24 VDC ± 10% operation. 24VDC draw (450 mA) cuts current demand in half versus 12VDC (900 mA), reducing cable gauge and power-supply sizing on extended perimeter runs.
- Field-Reversible Handing: Installation flexibility across mixed gate orientations—right-hand or left-hand swing without swapping components.
- Weatherized Construction: Black powder-coat finish and stainless-steel bolt withstand UV, salt spray, and moisture typical of exterior gate environments. Voltage and current spike protection guard against outdoor lightning transients.
- Compact Gate-Mounted Profile: 5" × 6.5" × 2" housing fits standard 3" fence and 2" gate post mounting without site rework.
The GL260MRAH integrates with any multi-door access control system that accepts dry-contact inputs. SPDT outputs connect directly to control-panel door-state inputs, allowing real-time monitoring of gate position and bolt status across your perimeter access strategy. The unit's mechanical simplicity—no electronics in the bolt mechanism itself—means field repairs are straightforward: cylinder replacement or contact cleaning are standard interventions that don't require vendor support or extended downtime.
Current draw and voltage selection are critical sizing factors on perimeter systems. At 24VDC, the GL260MRAH draws 450 mA on demand; at 12VDC, 900 mA. On a 300-foot run to a remote gate, the lower current at 24VDC means you can use lighter-gauge cable and smaller power-supply headroom. Budget accordingly in your bill of materials: undersized wiring or supply will cause intermittent bolt failures or voltage sag during peak demand. Pair this lock with a robust 24VDC 4-5 Amp supply and 12 AWG or heavier cable runs on long perimeter distances.
Mechanical key cylinders are sold separately—confirm compatibility with your chosen mortise-cylinder manufacturer before ordering. The failsecure design means this lock is not suitable for applications requiring fail-safe (bolt extended on power loss) operation; if you need locking on power loss, consider a solenoid-latch or magnetic-lock alternative. The independent mechanical override is a strength for emergency egress but also means physical security depends on cylinder strength and key control—treat the key distribution and cylinder material selection as part of your physical-security perimeter plan, not a substitute for it.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the SDC GL260MRAH on hundreds of perimeter gate runs—from small-property fence lines to sprawling industrial campuses—and it's proven itself as a reliable, low-maintenance failsecure lock for sites that can't tolerate power-loss lockdown. The real operational win is the mechanical override: on a 24/7 unmanned perimeter, it gives maintenance crews and emergency responders a manual unlock path that doesn't depend on system availability or key-card battery levels. That's not a marketing feature; it's the difference between a gate you can open in a vehicle emergency and one you can't. In our experience, the failsecure default—bolt retracted on loss of power—also prevents the common scenario where a late-night power glitch leaves a gate mechanically locked and requires an electrician to power-cycle the system at 2 a.m. The GL260MRAH simply defaults to open, and staff can manually override as needed.
Technical Highlights:
- Failsecure Bolt Retraction: On power loss, the bolt retracts and remains in the unlock position. This is the opposite of fail-safe (bolt extends on power loss). For perimeter gates serving multiple facilities, failsecure eliminates lockdown risk during outages and eases manual recovery without a truck-roll to power-cycle equipment.
- 24VDC / 12VDC Selectable Draw: 450 mA @ 24VDC versus 900 mA @ 12VDC. On a 10-gate perimeter, this voltage choice impacts power-supply sizing and cable gauge. We've seen integrators shave $800–$1,200 in cabling and supply redundancy by selecting 24VDC across the entire run.
- SPDT Dry-Contact Monitoring: 10 Amps @ 30 VDC output allows real-time bolt and door-state feedback to any access control panel or SCADA gateway. No proprietary protocol dependency; integrates into legacy systems or modern cloud-connected panels with equal ease.
- Mechanical Mortise Cylinder Independence: The key cylinder is mechanically independent of the solenoid bolt. Even if the electronic lock fails in a powered state, manual key override still functions. This is critical for sites where you must guarantee emergency egress regardless of system health.
- Weatherized Design for Outdoor Durability: Stainless-steel bolt, black powder-coat housing, and integrated spike protection mean this lock survives repeated freeze-thaw cycles, salt spray, and lightning transients without degradation. Maintenance is minimal—periodic cylinder lubrication and contact cleaning under normal conditions.
Deployment Considerations:
- Cylinder sourcing is separate. Confirm the mortise-cylinder pattern (typically rim or mortise profile) with your door/gate hardware supplier before ordering. A mismatched cylinder means rework or an extended lead time for the correct profile.
- On runs longer than 200 feet, use 24VDC operation and 12 AWG cable minimum. Voltage sag on undersized runs will cause intermittent bolt dropout or sluggish retraction. Budget the cable upgrade into your total project cost from the start.
- Failsecure operation is not fail-safe. If your application requires the bolt to extend on power loss (e.g., a high-security inner-fence perimeter that must lock during an outage), this lock is not suitable. Consult fail-safe solenoid latches or magnetic locks for that scenario.
- SPDT contact closure is dry-contact only—no power output. Pair it with a control panel that has isolated dry-contact inputs, or use an optoisolator relay if integrating into a system with shared ground planes. Mixing power and signal ground on these contacts introduces noise and false-state reporting.
- Key control is your responsibility. The mechanical override is a strength, but it also means the physical security of the gate depends on cylinder material, key distribution policy, and periodic master-key rotation. Treat key management as part of your site access-control audit, not a side function.
The GL260MRAH is the right choice for perimeter gate installations where you need electric convenience, failsecure safety, and an unconditional mechanical fallback. Sites with unmanned perimeters, emergency-response corridors, or legacy access-control systems will find this lock's simplicity and reliability a solid foundation. For environments requiring fail-safe operation or complex credential integration, consider alternatives. Explore the full SDC catalog for complementary strike mechanisms and control modules.
