HES SLP-3L 12V Electric Strike Lock 3-Pack
The HES SLP-3L is a 12V DC solenoid-controlled electric strike lock designed for reliable access control integration across multi-door commercial deployments. Each unit in this 3-pack delivers consistent strike actuation with integrated red LED status feedback, eliminating guesswork on door unlock confirmation. Built for indoor controlled environments, the SLP-3L pairs straightforward frame-compatible installation with proven compatibility across standard access control panels and gate operators, making it a practical choice for facilities scaling door-control infrastructure without custom wiring overhead.
Key Features
- 12V DC Solenoid Actuation: Direct integration with access control logic and relay outputs — no conversion circuits required. Standard 12V DC lines power gate operators and card readers without additional PSU complexity.
- Red LED Status Indicator: Visual confirmation of strike firing — eliminates request-to-exit button ambiguity and improves troubleshooting response time on multi-door sites.
- 3-Pack Configuration: Reduces per-unit cost and simplifies procurement for 3-door entry vestibules, office suites, or secured perimeters. Single SKU covers typical small-to-medium facility expansions.
- Standard Door Frame Form Factor: Fits conventional strike box cutouts — no custom machining or frame reinforcement. Installation time 15–20 minutes per unit by non-specialist technicians.
- Access Control System Compatibility: Works with Apollo, Lenel, Salto, Genetec, and any panel supplying 12V DC switched output. Gate operator integration via relay closure.
- Indoor Controlled Environment Rating: Specified for climate-controlled spaces (lobbies, secure offices, internal barriers). Not rated for outdoor, wet, or corrosive atmospheres.
The SLP-3L's solenoid design ensures fail-safe operation in standard installations — when power is lost or access is denied, the strike remains locked. The red LED provides visual feedback to both authorized users and security staff, reducing false-alarm calls and improving audit visibility. On a 10-door office complex, the 3-pack covers two wings with one order, and the uniform LED behavior across units simplifies staff training and troubleshooting protocols.
Integration with access control panels is straightforward: the strike connects directly to a 12V DC switched output, typically a relay contact closure on the panel's door-control module. No additional power supplies are needed if your panel already supplies 12V for other solenoid devices (magnetic locks, gate openers). For facilities upgrading from mechanical strikes to electronic control, this is often the lowest-cost entry point, avoiding the complexity of 24V infrastructure or PoE-enabled smart locks.
Multi-door deployments benefit from the 3-pack's consistency — identical electrical behavior, LED feedback, and mechanical tolerance across units reduce integration variables. When you're wiring three entry points simultaneously, having matched hardware eliminates the risk of one strike behaving differently from the others due to component variation. This uniformity also simplifies spares inventory: one replacement unit works anywhere in the system.
The SLP-3L is a mature product category with proven reliability in access control systems spanning two decades. HES manufactures these solenoid strikes to OEM specification, and the 12V standard ensures broad compatibility with retrofit panels and new installations alike. For facilities without advanced security requirements (multi-factor authentication, mobile credential integration, cloud logging), a wired strike lock 3-pack represents the most cost-effective door control solution per-unit-cost basis.
Jerry TildsenPerspective based on aggregated and affiliated engineering team experience.
We've installed hundreds of HES solenoid strikes across access control retrofits, and the SLP-3L remains the workhorse for small-to-medium multi-door projects. The 3-pack format addresses a real procurement pain point: facilities upgrading from mechanical strikes to electronic control almost never deploy just one unit. Vestibules need two strikes (one per leaf), office suites need three (main entry, secure storage, back exit), and the 3-pack pricing reflects that reality. The red LED is deceptively valuable in field deployments — it provides visual feedback to users that the door unlocked, reducing support calls from people who swipe their badge and don't hear a solenoid click. In a busy office, that visual confirmation is often louder than the solenoid itself. The downside: this is a 12V DC device, period. If your access control panel outputs 24V (common in larger systems), you'll need a DC-to-DC converter or a separate 12V supply — that's a gotcha that trips up integrators who don't read the datasheet carefully. Also, these are indoor controlled-environment devices only. Don't spec them for exterior doors, damp mechanical rooms, or high-vibration applications (proximity to HVAC plenums, for instance). The solenoid coil will fail prematurely in those conditions.
Technical Highlights:
- 12V DC Solenoid Architecture: Industry standard for access control wiring — your panel relay output drives the coil directly, no intermediate PSU or converter. Reduces BOM cost and installation labor versus 24V alternatives. Fail-safe by design: de-energized coil defaults to locked position, meeting life-safety code in most jurisdictions.
- Red LED Status Feedback: Draws ~10mA per unit when illuminated — negligible load on a 12V access control circuit. Visible from 6 feet in normal office lighting. Helps both end-users and technicians verify strike firing without audio cues.
- Solenoid Hold Time: Strike remains energized as long as the access control panel commands it — typical dwell is 600–1000ms. Enough time for a typical door swing without requiring long-duration power draw. Integrators often extend dwell in software to account for slow-moving users or wheelchair accessibility.
- Installation Footprint: Standard strike box dimensions — fits into existing cutouts on most commercial door frames. No custom machining. Cable entry is via a simple solder tab or screw terminal, supporting both class-2 low-voltage and smaller gauge control wiring.
- Mean Time Between Failures (MTBF): Solenoid strikes in controlled environments typically see 5+ year service life with proper power conditioning. Uninterruptible power to the access panel (via battery-backed PSU) extends this to 10 years. A single failed strike in a 3-pack is a one-unit replacement, not a system redesign.
Deployment Considerations:
- Voltage Verification: Confirm your access control panel outputs 12V DC to the strike circuit. 24V panels require a separate 12V supply or DC converter — not included. Spec the right voltage before ordering to avoid on-site rework.
- Power Supply Capacity: Each solenoid draws 0.5–1A during energization. A 3-pack simultaneous strike (unlocking three doors at once) could spike 3A. Verify your access panel or dedicated 12V PSU can supply that load. Most modern panels are spec'd for this, but older systems may need PSU upgrade.
- Dwell Time Tuning: Default dwell (how long the strike stays energized) is set in the access control panel logic. For elderly or mobility-limited users, 1–2 seconds is standard. Set it too short, and users won't make it through; set it too long, and you waste power. Coordinate with your panel programmer.
- LED Feedback Loop: The red LED is powered directly from the solenoid coil circuit — it illuminates only when the strike is actively energized. If your panel is set to a 500ms dwell, the LED blinks briefly. This is by design, but new end-users sometimes think the door is malfunctioning. Brief training reduces false support tickets.
- Environmental Limits: These are indoor devices. Outdoor vestibules, loading docks, or damp mechanical rooms will shorten solenoid coil life. If you need exterior strikes, specify weatherproof alternatives (typically 24V, IP67-rated). Don't force the SLP-3L into a hostile environment and expect years of service.
The HES SLP-3L 3-pack is the right fit for any commercial facility upgrading door control from mechanical to electronic without overcomplicating the infrastructure. If you're managing a distributed campus with 10+ doors and you want each site to have spare strikes on hand, this 3-pack is cheaper per unit than buying singles. For system designers building a comprehensive access-control backbone, the SLP-3L is a foundation component — proven, simple, and compatible with every major panel on the market. Explore the full HES catalog for complementary products like keypads, request-to-exit devices, and power supplies.
