ACR SM-3 SOLAS Lifebuoy Self-Igniting LED Marker Light 3947 USCG MED
22388
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ACR SM-3 SOLAS Lifebuoy Marker Light
A self-righting, buoyant high-intensity LED strobe designed to mark a crew-overboard position. When deployed and floating upright, its automatic gravity switch starts the 360° strobe to assist visual location and recovery in darkness or poor visibility.
Key safety features
- High-intensity LED strobe with 360° visibility
- Approximate visual range: 2 nautical miles in suitable conditions
- Automatic gravity/orientation switch - activates when the unit is upright
- Self-righting and buoyant design keeps the lamp above the water
- Minimum light intensity: 3 candelas per flash
- Flash rate: 50-70 flashes per minute
- USCG, MED and SOLAS approved
- Drop-tested to 76 m, exceeding the 30 m SOLAS test requirement
- UV-resistant polycarbonate housing and mounting bracket
- Direct bracket-footprint replacement for the previous ACR SM-2
Technical specifications
| Manufacturer / model | ACR Electronics SM-3 / 3947 |
| Light source | High-intensity LED strobe |
| Visibility | 360°; approximately 2 nautical miles |
| Light intensity | Minimum 3 cd per flash |
| Flash rate | 50-70 flashes/minute |
| Activation | Automatic gravity switch when upright |
| Battery requirement | 2 × AA Energizer L91 lithium batteries - not included |
| Operating duration | Over 40 h at 30°C; over 24 h at -1°C |
| Dimensions | 253 mm long × 56 mm diameter |
| Weight | 300 g light only; 330 g with batteries; 406 g with batteries and bracket |
| Material / colour | UV-resistant polycarbonate / international safety orange |
| Approvals | USCG / MED / SOLAS |
Applications and installation
Designed for lifebuoy and crew-overboard stations on commercial and recreational vessels, including workboats, passenger craft, fishing vessels, tugs, supply vessels, cruise vessels and petro-marine installations.
- Mount beside the assigned lifebuoy using the supplied quick-release bracket.
- Connect the light to the lifebuoy with the correct lanyard arrangement required for the vessel.
- Keep the unit inverted in its bracket so the gravity switch remains off during storage.
- Fit only the specified lithium batteries and observe their expiry and replacement instructions.
- Test and inspect in accordance with the ACR instructions and the vessel's safety-management schedule.
What is included
- 1 × ACR SM-3 LED lifebuoy marker light
- 1 × UV-resistant mounting bracket
- Manufacturer instructions
Batteries are not included. Two compatible AA Energizer L91 lithium batteries are required.
Frequently asked questions
Does the light activate automatically?
Yes. The gravity switch activates the strobe when the light is upright after deployment. It is stored inverted in the mounting bracket.
Are the batteries included?
No. The SM-3 requires two AA Energizer L91 lithium batteries, which are user replaceable.
Will it replace an older ACR SM-2?
Yes. The supplied SM-3 bracket uses the same mounting-hole pattern as the previous SM-2, simplifying retrofit installation.
Is it suitable for SOLAS-regulated vessels?
The SM-3 carries USCG, MED and SOLAS approvals. The vessel operator remains responsible for confirming the exact carriage, installation and inspection requirements that apply to the vessel.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
