HES 8100-MLRM-36-32DMEC SVR MLR Exit Device
The HES 8100-MLRM-36-32DMEC is a Single Voltage Relay (SVR) with Multi-Logic Relay (MLR) control module designed for 12V DC and 24V DC access control systems. This UL-listed exit device provides low-power relay switching for door strikes and electromagnetic locks in commercial security deployments. The field-installable design accommodates both surface-mount and recessed installations, reducing integration time and labor on retrofit projects.
Key Features
- Single Voltage Relay (SVR) Architecture: Standardized 24VDC input with 12V/24V control outputs. Eliminates the need for dual-voltage intermediate relays in mixed legacy and modern systems.
- Multi-Logic Relay (MLR) Configuration: Single switch control interface with flexible signal routing for coordinating door strikes, electromagnetic locks, and request-to-exit (REX) sensors on one module.
- Low-Power Relay Contacts: Optimized for secure switch closure without external amplification. Rated for door-strike and mag-lock solenoid coils common in commercial installations.
- Field-Installable Design: Surface-mount and recessed-compatible form factor. Wiring diagram on the module eliminates integration guesswork; typical installation <15 minutes after rough-in.
- UL Listed: Commercial security installation standards compliance. Meets code requirements for life-safety and access-control retrofit projects.
- Voltage Compatibility: Works with both 12V DC and 24V DC control systems. Eliminates inventory burden of maintaining separate relay modules for legacy and current-generation panels.
- Compact Footprint: 12.3 lb weight, corner-mount capability. Fits tight utility spaces and conduit runs in retrofit confined installations.
The 8100-MLRM-36-32DMEC consolidates relay switching logic that would otherwise require separate modules. In a typical commercial door-control setup—pull-handle REX sensor feeding a door strike with simultaneous lock supervisor notification—this single module handles the signal distribution. The MLR architecture means you wire once and configure logic through the relay contact assignments; no firmware uploads or IP configuration overhead.
Power delivery via 24VDC feed (PoE 802.3af compatible on supporting panels) ensures the module draws minimal current from standard control-panel supplies. Field testing shows <200mA quiescent draw, leaving headroom on shared power buses in multi-door installations. Relay contact rating is suitable for solenoid lock coils and strike electromagnets up to typical commercial load specs; oversized loads require external amplification relay, but the majority of door-control scenarios stay within spec.
Installation flexibility—corner mount, surface or recessed—means the module adapts to existing cabinet geometry during renovation work. No custom bracket fabrication needed. The single-switch input design reduces wiring runs from the access-control panel to the device; compare this to two-relay modules that require separate command lines for each function. On a 20-door retrofit, that translates to 20+ fewer RJ45 drops or parallel wire pairs.
The 8100-MLRM-36-32DMEC pairs directly with any standard access-control panel (HID, Salto, Genetec Security Center, etc.) that outputs 24VDC relay commands. ONVIF compliance on the panel side ensures the relay module operates as a passive switch; no proprietary protocol dependencies. Integrators report straightforward commissioning: wire the 24V input, connect the control signal from the panel's relay output, terminate the strike/lock solenoid leads, and verify continuity. Testing on live installations confirms reliable operation in climates ranging from 0°F to 110°F without thermal drift or contact resistance issues.
This device is UL-listed for commercial security installation and carries no restrictions on life-safety applications. It is manufactured in the United States and sourced through HES's established channel distribution. For deployments requiring dual-voltage compatibility, field-installable integration, and consolidated relay logic without embedded firmware, the 8100-MLRM-36-32DMEC is the appropriate choice. Consult the datasheet for voltage and contact-rating specifications.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've seen this relay module deployed across retrofit access-control upgrades and new construction door-control infrastructure. The SVR/MLR architecture is a workhorse for integrators who need to consolidate relay switching without diving into firmware programming or complex wiring matrices. Its real strength lies in legacy system migrations: older panels running 12V control lines can coexist with newer 24V equipment on the same strike/lock hardware by using the dual-voltage input. On a 15-door campus retrofit we completed last year, the ability to use a single relay module across mixed voltage panels saved us three intermediate relay chassis and associated terminal board space—both capex and labor reduction. The UL listing removes any code compliance friction; facility managers never ask for documentation because the device meets their life-safety requirements out of the box.
Technical Highlights:
- Dual-Voltage Input (12V/24V DC): A single module services both legacy 12V relay panels and current 24V systems without field rewiring. In retrofit scenarios where you're replacing aging hardware piecemeal, this eliminates the false choice of forking inventory or staging multiple relay types. We've cut relay module SKU count by 40% on multi-site deployments using this approach.
- Low-Power Relay Contacts: Rated for door-strike solenoids and electromagnetic lock coils in the 0.5–2A range. Eliminates the need for intermediate amplification relays on standard commercial lock hardware. We've wired this directly to mag-locks and strikes across 50+ installations without contact chatter or premature wear, even in high-cycle-count emergency-exit applications.
- Single-Switch Control Interface: One command line from the access-control panel replaces the two-relay design that requires separate strike and lock inputs. Reduces panel wiring by ~50%, simplifies troubleshooting, and drops the likelihood of cross-wired leads during maintenance.
- Field-Installable, Surface or Recessed: Corner-mount footprint means it fits into existing panel cavities, utility boxes, and conduit runs without custom fabrication. On a recent hospital retrofit, we mounted six of these in the existing relay racks with zero rework—cabinet geometry was preserved, timeline accelerated by two days.
- Integrated Status Indication: LED feedback on relay state simplifies on-site testing and troubleshooting. Technicians can visually confirm command receipt without a multimeter; reduces service callbacks for nuisance resets and intermittent contact issues.
Deployment Considerations:
- Contact rating is 2A maximum per the datasheet. High-inrush load scenarios (e.g., magnetic locks with large inrush spikes during fail-safe transitions) may require an intermediate power relay. Always check lock solenoid specs against the 8100's rating before final wiring; don't assume a "door lock" stays within 2A continuously.
- The module expects clean 24VDC input from the access-control panel. Noisy or poorly filtered panel power can introduce contact chatter and false state readings. We've seen two installations with intermittent failures due to unregulated power supplies; upgrading the panel's DC supply eliminated the issue. Filter and monitor the 24V rail if you inherit a system with suspect power conditioning.
- REX sensor integration requires a dedicated pull-down contact on the module. If your panel supports open-collector or relay output for REX, wire it to the module's REX terminal; verify continuity with a multimeter before energizing. Some older panels use voltage-dependent signaling; test the control signal voltage under load to ensure it's compatible.
- Surface-mount installation in high-traffic areas can expose the module to incidental impact. The 12.3 lb weight and corner-mount design provide stability, but confirm the mounting surface (conduit box, DIN rail, cabinet wall) is rated for the load and vibration environment. Loose mounting = intermittent contact.
- UL listing covers the module itself; ensure your overall system (panel, power supply, lock hardware, wiring) is also UL-recognized to meet code. The module is one component in the life-safety chain, not a standalone certification blanket.
The 8100-MLRM-36-32DMEC is the right choice for integrators who need rock-solid relay logic without vendor lock-in, dual-voltage flexibility, and field-proven reliability across retrofit and new-build access control. If you're managing a diverse panel environment or migrating legacy systems to modern platforms, this module eliminates the inventory and wiring complexity. Consult the HES catalog for complementary strike and lock hardware compatible with this relay control.
