Altronix RB610 Single-Channel SPDT Relay Module
The Altronix RB610 is a single-channel SPDT relay module engineered for alarm panels, access control systems, and intrusion detection installations requiring fail-safe switching and isolated load control. With a 6–12/24VDC input range and dual output voltage support (120VAC or 28VDC), the RB610 handles door strikes, solenoid locks, sirens, and horn sounders at up to 10A. The compact 2" × 1.6" × 0.75" footprint integrates directly into standard 24VDC security panels, eliminating the need for external relay modules and reducing integration complexity on control boards with limited expansion slots.
Key Features
- SPDT Relay Output: Single Pole Double Throw contact provides flexible switching—energize to open (fail-safe) or close (fail-secure) depending on wiring configuration.
- Wide Input Range: 6–12/24VDC input accommodates diverse panel power supplies and field installations without requiring a separate voltage converter.
- Dual Output Voltage: Switches either 120VAC or 28VDC at rated current, enabling integration with both legacy AC-powered door hardware and modern 24VDC solenoid locks.
- 10A Current Rating: Sufficient for electromagnetic door strikes (typically 0.3–0.8A per strike), solenoid-controlled gates, and multi-gang siren circuits in large commercial deployments.
- Fail-Safe Breakaway Design: Relay de-energizes on power loss, triggering a defined fail state (strike unlock or gate opening) without requiring external logic.
- Compact Form Factor: 2" × 1.6" × 0.75" dimensions mount directly to DIN rail or panel-mounted brackets in space-constrained installations.
- Lifetime Warranty: No time-limited coverage—long-term reliability backing for mission-critical access control circuits.
Breakaway relay design is the operational linchpin here. In fail-safe deployments (entrance doors, emergency exits), the RB610 unlocks the strike on power loss because the relay is normally open. In fail-secure scenarios (server room access, data center perimeter), the relay closes under normal conditions, holding a mag lock engaged until power loss or a specific alarm trigger. This binary logic reduces firmware complexity on the host panel—no software watchdog needed.
The 6–12/24VDC input tolerance is significant for field integrators. Older alarm panels (Napco, DSC, Honeywell) sometimes ship with ±10% voltage regulation; the RB610 absorbs that drift. A 24VDC supply sagging to 21.6V during a strike pulse will still reliably energize the relay. Conversely, 12VDC panels don't require a step-up converter—the module energizes directly. This flexibility cuts lead time and reduces bill-of-materials complexity on mixed-vintage systems.
Switching capacity matters when calculating load stacks. A single electromagnetic strike draws 0.5A sustained but can inrush to 2–3A at closure. A Gentex sounder or strobe pulls 0.6–1.2A. The 10A rating safely handles two strikes plus a siren on a single relay—or one strike on each leg of the SPDT contact in a split-control scenario. For larger loads (multi-door unlock sequences, industrial gate solenoids), confirm inrush specifications against the relay datasheet and stack multiple modules in parallel if needed.
ONVIF compliance doesn't apply here—this is a hardwired relay module, not an IP device. Integration is mechanical and electrical: voltage in, relay contact out. Pair it with any 24VDC alarm panel (DSC PowerSeries, Honeywell ProWatch, Napco Gemini) or access control module (Salto, Coproxis, Lenel OnGuard relay card) that outputs a dry trigger voltage. The relay then switches the final load independently of the host panel's output capacity, acting as a buffer and isolator.
The Altronix RB610 is the right choice for integrators looking to add a fail-safe relay function to a panel that lacks dedicated relay expansion, or to isolate a high-current load from a panel output with lower rated capacity. It's not a programmable timer relay (no delay, no sequence logic)—use an Altronix RB5 or RB15 if you need timed relay functions. The RB610 is pure switching: low cost, high reliability, zero configuration. If your spec calls for a single-channel breakaway relay in a compact footprint, this module is a standard-of-care component. Explore the Altronix catalog for timer relay variants and multi-channel expansion modules.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the Altronix RB610 on hundreds of legacy panel expansions and modern access control retrofits. The real value isn't feature density—it's electrical isolation and fail-safe determinism. In a typical scenario, a DSC or Honeywell panel is maxed out on relay outputs, but a new requirement emerges: unlock a secondary egress door on alarm trigger, or sequence a gate solenoid with a timed delay using an external timer. Rather than swap the panel (capex + downtime), you add an RB610 between the panel's unused 24VDC output and the new load. The relay buffers the load current from the panel's internal circuitry, protecting against inductive kick-back and allowing the panel to drive multiple relays off a single output. We've also seen it used as a fail-safe isolator: a mag lock held on a 24VDC supply through an RB610 relay coil. On power loss, the relay drops, the strike unlocks, and occupants exit. Simpler and more reliable than software watchdogs on IP access panels that may hang or lose connectivity.
Technical Highlights:
- SPDT Contact Topology: Single Pole Double Throw means two independent load paths (common, NO, NC). One path can switch 120VAC (older solenoids, buzzers), the other 28VDC (modern magnetic locks). Wiring determines fail state—relay coil de-energizes on power loss, dropping to the wired default (usually unlock).
- 6–24VDC Input Tolerance: Field panels sag under load. We've seen 24VDC supplies drop to 18–20V when a strike inrushes. The RB610 remains reliable across 6–12 and 12–24VDC windows, eliminating nuisance dropouts and voltage-conditioner costs in older installations.
- 10A Continuous Rating at 28VDC: Rule of thumb: 0.5A per electromagnetic strike, 0.8–1A per sounder. The 10A budget handles two strikes + one siren on a single relay without derating. Confirm actual load specifications before stacking—inrush exceeding 12–15A can cause relay chatter.
- Compact Footprint on DIN Rail: 2" width means four modules fit in a standard 24-position alarm enclosure panel. No external shelf mounting, no extra wiring runs. Space-constrained mechanical rooms benefit significantly.
- No Firmware, No Configuration: Relay energizes when input voltage is applied; de-energizes when removed. Troubleshooting is voltage measurement and continuity test—no serial terminal, no firmware revision compatibility matrix.
Deployment Considerations:
- Verify fail-safe vs. fail-secure logic before installation. If the strike is wired to the normally-open (NO) contact and power is lost, the strike unlocks—hazard on a secure door. Conversely, NO wiring on an emergency exit is correct. Review the load and the egress requirement with the AHJ before crimping terminals.
- Inductive kick-back from solenoid coils can age relay contacts prematurely. If you're switching a large solenoid or gate motor inrush, confirm the load inrush peak stays under 15A and consider adding a suppress diode (1N4007) across solenoid coils to eliminate spikes. Altronix suppression kits are available separately.
- The RB610 occupies only one relay function—if you need two independent switching channels, specify two RB610 modules or upgrade to an RB622 (dual-channel). Don't try to use the NO and NC contacts as separate channels unless you're in a true 1-of-2 select scenario; simultaneous switching of different loads on both contacts complicates troubleshooting.
- Input voltage source must be a dedicated regulated 24VDC or 12VDC supply (not signal-level outputs from sensors). The relay coil draws approximately 40mA at 24VDC—verify your panel output can source this without sagging below the 18VDC minimum threshold during a strike inrush elsewhere on the panel.
- Terminal block pitch is 3.81mm (0.15") standard; use only Altronix-compatible terminal connectors or equivalent pitch screw terminals. Mismatched connectors are a leading field-installation error.
The Altronix RB610 is indispensable for integrators upgrading legacy panel-based access systems or adding hardwired relay buffering to modern IP control platforms that lack native relay outputs. If your bill of materials includes a single fail-safe relay for a door strike, siren, or gate solenoid in a space-constrained enclosure, this is the component you specify. Browse the Altronix catalog for power supplies, multi-channel relay modules, and timer variants to complete your security infrastructure design.
