Viking Electronics SC-911 911 Strobe Controller
The Viking Electronics SC-911 is a dedicated 911-call strobe controller built for commercial environments where silent visual notification of an emergency call is required. When a 911 call is initiated, the SC-911 triggers a red LED strobe visible up to 100 feet and closes a set of dry relay contacts — giving security staff an immediate visual alert and enabling downstream integration with door locks, intercoms, or panel inputs. The SC-911 (often searched as SC 911) ships complete with a 120VAC-to-12VDC power adapter, so it installs directly from a standard wall outlet with no separate power supply required.
Overview
Commercial lobbies, schools, healthcare facilities, and warehouse offices often need more than an audible signal when a 911 call is placed — particularly in noisy environments where a ringing phone goes unnoticed. The SC-911 solves this with a compact, purpose-built controller: a bright red LED strobe for visual confirmation, plus a relay output for integrators who need to trigger a secondary device. Housed in a wall-mountable enclosure measuring just 2.9" x 2.1" x 1.4", it installs discretely near a desk phone or emergency callbox without drawing attention. Explore the full Viking Electronics line for complementary emergency communication products.
Key Features
- Red LED Strobe — 100 ft Visible Range: The 0.75" (20mm) red LED activates on 911 call and is rated visible at 100 feet — far enough to be seen across a large open-plan floor or through a glass partition without requiring a separate external strobe fixture.
- Included 12VDC Power Adapter: Ships with a 120VAC-to-12VDC wall adapter, so installation requires nothing more than a standard outlet. No separate power budget to plan, no 24VDC panel tap needed. Total current draw is 350mA maximum — well within the adapter's capacity.
- Dry Relay Contact Output (.5A @ 125VAC / 1A @ 30VDC): The onboard relay closes when a 911 call is detected, giving integrators a dry contact to work with. Wire it to a door lock release, an intercom alert input, a secondary strobe, or an access control panel input — the contact rating handles typical low-voltage security loads without a relay driver in between.
- Wall-Mountable Compact Footprint (2.9" x 2.1" x 1.4"): Fits on a standard single-gang backbox area or surface-mounts directly to drywall. The compact depth of 1.4" keeps it flush enough for under-desk or beside-phone placement without protruding into a work area.
- Wide Humidity Tolerance — 5% to 95% Non-Condensing: Rated for 5% to 95% relative humidity (non-condensing), so it handles HVAC-challenged spaces like server rooms, loading dock offices, or older commercial buildings without humidity-related failures.
- 32°F to 90°F Operating Range: Covers typical commercial interior environments. This is not a device for unheated vestibules or outdoor enclosures — plan accordingly if your installation point drops below freezing in winter.
Integration & Compatibility
The SC-911 is designed to sit on an analog phone line — when the line goes off-hook and dials 911, the controller responds. The relay output (rated .5A @ 125VAC / 1A @ 30VDC) gives you a dry contact for integration into virtually any access control or alarm panel that accepts a normally-open input. Pair it with Viking's emergency phones and callboxes for a complete notification loop, or integrate with third-party intercoms and lockdown systems. For facilities building a broader emergency communication architecture, review the emergency communication planning guide to scope the right combination of alert devices. The relay contact is also suitable for driving a secondary strobe light or siren in larger spaces where a single 100 ft LED isn't sufficient coverage.
Frequently Asked Questions
Q: What triggers the SC-911 to activate?
A: The SC-911 activates when a 911 call is placed — it monitors the phone line and responds by illuminating the red LED strobe and closing the relay contacts.
Q: Does the SC-911 include a power supply?
A: Yes. The SC-911 ships complete with a 120VAC to 12VDC power adapter, so no separate power supply is required for standard installations.
Q: What can I connect to the relay output?
A: The relay contacts are rated .5A at 125VAC or 1A at 30VDC. Common applications include door lock releases, secondary strobe lights, alarm panel inputs, or intercom alert triggers — anything within that contact rating that accepts a dry contact closure.
Q: How far away can the red LED strobe be seen?
A: Viking rates the 0.75" (20mm) red LED as visible at up to 100 feet under typical conditions.
Q: Can the SC-911 be used outdoors?
A: The SC-911 is rated for indoor use, with an operating temperature range of 32°F to 90°F and humidity rated for non-condensing conditions. It is not designed for outdoor or unheated environments.
Q: What are the mounting options for the SC-911?
A: The SC-911 is wall mountable. Its compact 2.9" x 2.1" x 1.4" footprint allows surface mounting near a desk phone or emergency callbox.
The SC-911 is one of those devices that solves a specific, underserved problem cleanly. In noisy commercial environments — warehouses, cafeterias, open office floors — a 911 call placed from a desk phone goes completely unnoticed by anyone not standing next to the caller. The SC-911 addresses that directly: the red LED strobe triggers at the moment of the 911 call, visible at up to 100 feet, while the dry relay contact gives you a simultaneous output to drive a secondary alert device or notify an access control panel. Small footprint (2.9" x 2.1" x 1.4"), included 120VAC adapter, wall-mountable — it's wired and operational in under 30 minutes on a standard analog line.
Technical Highlights:
- Relay Contact Rating (.5A @ 125VAC / 1A @ 30VDC): Handles most low-voltage security loads directly — no relay driver board needed between the SC-911 and a standard door lock or panel input.
- Maximum Current Draw 350mA: Well within the included 12VDC adapter's capacity; no power budget calculation required for a standalone install.
- Operating Humidity 5%–95% Non-Condensing: Handles real-world commercial HVAC environments without additional protection, though the 32°F–90°F temperature ceiling keeps it indoors.
Deployment Considerations:
- The relay contact rating (.5A @ 125VAC) is adequate for low-current signaling loads but won't directly drive high-draw electric strikes — verify your strike's current requirement before wiring direct.
- The 90°F upper temperature limit is the real constraint: mechanical rooms, server rooms without cooling, or south-facing exterior offices in summer can exceed this — verify ambient temp before install.
Best fit for commercial facilities — schools, healthcare lobbies, corporate reception desks — where a receptionist or security monitor needs a visible 911 alert that doesn't depend on hearing a call being made.
