Simplex 4906-9104 — a ceiling-mount TrueAlert multi-candela visible-only (V/O) notification appliance: a 24 VDC synchronized xenon strobe in a white housing with red FIRE lettering.
This is a strobe alone, with no horn and no speaker — the appliance you use where visible notification is required but audible output is provided elsewhere. Intensity is selected in the field to 15, 30, 75 or 110 candela using a plug at the back of the housing, with a yellow flag showing the chosen setting through a slot beside the lens, and the factory setting is 15 cd. One model therefore covers four candela ratings, which keeps site inventory small and absorbs the intensity changes that surface during construction. The polarized input connects to a compatible reverse-polarity supervised NAC, and a regulated circuit design holds the flash output consistent while controlling inrush current. Strobes flash together at 1 Hz when driven from a panel NAC selected for strobe synchronization or SmartSync two-wire control, from a 4009 IDNet NAC Extender, or from a separate synchronization or SmartSync control module. The housing is rugged, high-impact, flame-retardant thermoplastic, impact and vandal resistant, and its rear does not extend into the box.
Specifications
| Device type |
Non-addressable ceiling-mount visible-only appliance, multi-candela synchronized xenon strobe |
| Housing and lettering |
White housing, clear lens, red FIRE lettering |
| Candela settings |
15 cd, 30 cd, 75 cd or 110 cd, field selectable; factory setting is 15 cd |
| Rated voltage range |
Regulated 24 VDC, meaning 16 to 33 VDC per UL 1971 |
| Flash rate |
1 Hz |
| Synchronized NAC loading |
Up to 35 synchronized strobes maximum per NAC |
| Maximum RMS current (nameplate) |
15 cd: 75 mA · 30 cd: 125 mA · 75 cd: 233 mA · 110 cd: 316 mA |
| Reference RMS current at 24 VDC |
15 cd: 50 mA · 30 cd: 83 mA · 75 cd: 155 mA · 110 cd: 211 mA |
| Reference RMS current at 18 VDC |
15 cd: 67 mA · 30 cd: 111 mA · 75 cd: 207 mA · 110 cd: 281 mA |
| Housing dimensions with lens |
4-3/4 in. L x 2-5/16 in. W x 2-5/8 in. D (121 mm x 75 mm x 67 mm) |
| Temperature range |
32°F to 122°F (0°C to 50°C) |
| Humidity range |
10% to 93%, non-condensing at 100°F (38°C) |
| Connections |
Terminal blocks for 18 AWG to 12 AWG (0.82 mm² to 3.31 mm²), two wires per terminal for in/out wiring; polarized input for reverse-polarity supervised NACs |
| Mounting |
Standard single gang electrical box; rear of housing does not extend into the box |
| Synchronization sources |
Simplex FACP NACs selected for strobe synchronization or SmartSync two-wire control; 4009 IDNet NAC Extenders; 4905-9914 (Class B) or 4905-9922 (Class A) synchronized flash modules; 4905-9938 SmartSync Control Module |
| Certifications |
Certified to UL 1971 and ULC S526; FM approved; CSFM 7125-0026:316; MEA (NYC) acceptance |
Installation notes
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Size the NAC from the maximum RMS rating. Strobe designs are constant wattage, so maximum RMS current occurs at the lowest allowable operating voltage. Circuit loading calculations should use the 316 mA nameplate figure at 110 cd, not the 211 mA drawn at 24 VDC.
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16 VDC is an absolute floor: the 16 to 33 VDC range is the absolute operating range and operation outside it may cause permanent damage to the strobe. 16 VDC is the lowest voltage allowed at the last appliance on the NAC under worst-case conditions.
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Set candela from the rear: the intensity selection plug is accessible only from the rear of the housing, so choose the setting before mounting; verify it afterwards through the intensity viewing slot at the side of the lens.
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Ceiling boxes are single gang for this model, unlike the wall-mount strobes, which take single gang, double gang or 4 in. square boxes.
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Surface mounting to a handy box requires the 4905-9910 zinc-plated surface mount adapter plate — unless the 4905-9926 ceiling wire guard is used, in which case the plate is not needed.
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Synchronization is worth having: where multiple strobes and their reflections are visible from one location, synchronized flashing reduces the probability of photo-sensitive reactions as well as the distraction of random flashing.
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Application selection: correct visible notification depends on occupancy, location and local codes — apply NFPA 72, ANSI A117.1, the governing model building code and the ADA guidelines.
Related models
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4906-9102 — the same ceiling-mount strobe in red with white FIRE lettering
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4906-9101 / 4906-9103 — the wall-mount versions, red with white lettering and white with red lettering; 5-1/8 in. x 5 in. x 2-3/4 in., with lower currents (110 cd nameplate 252 mA)
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4906-9128 / 4906-9130 — ceiling-mount horn/strobe (A/V) appliances if audible output is also needed at this point
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4905-9910 — zinc-plated surface mount adapter plate for handy boxes
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4905-9926 — ceiling-mount red wire guard, 6-1/8 in. x 4-3/8 in. x 2-7/8 in. deep
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4905-9914 / 4905-9922 / 4905-9938 — Class B and Class A synchronized flash modules and the SmartSync Control Module (data sheet S4905-0003)
Specifications taken from the Simplex data sheet "TrueAlert Multi-Candela Notification Appliances — Visible Notification Appliances with Synchronized Flash; Non-Addressable, SmartSync Operation Compatible," document S4906-0001-5 (11/2014). Manufacturer specifications are subject to change without notice.
Documents
FAQ
How is the candela setting changed?
With a selection plug at the rear of the housing: 15, 30, 75 or 110 cd. The factory setting is 15 cd, and a yellow flag shows the setting beside the lens.
What synchronizes the 4906-9104?
Simplex panel NACs set for strobe synchronization or SmartSync, 4009 IDNet NAC Extenders, or the 4905-9914, 4905-9922 or 4905-9938 modules. Up to 35 synchronized strobes are allowed per NAC.
What current should I use for NAC calculations?
Use the maximum RMS nameplate current: 75 mA at 15 cd, 125 mA at 30 cd, 233 mA at 75 cd and 316 mA at 110 cd.
What box does it mount to?
A standard single gang electrical box. For surface mounting to a handy box, use the 4905-9910 adapter plate unless the 4905-9926 wire guard is used.
