ACR HydroFix HRU Hydrostatic Release Unit for Category I EPIRB Brackets (9490.1)

The ACR HydroFix HRU is the scheduled replacement hydrostatic release mechanism used in compatible automatic-release Category I EPIRB brackets. If a vessel sinks, the water pressure at the specified depth activates the mechanism, allowing the bracket to release the beacon for flotation and distress signaling. Its mechanical rod design requires no battery or pyrotechnic charge.

Key Features & Benefits

• Automatic release function: Designed to release a Category I EPIRB at approximately 1.5 to 4 m submersion depth.
• Mechanical actuation: No operating battery, cutting blade or explosive charge.
• Service interval: Replace two years from installation or four years from manufacture, whichever comes first.
• Date tracking: Date-stamped unit supports proper expiry marking and maintenance.
• Factory-tested component: Purpose-built replacement for supported ACR Sea Shelter brackets.

Technical Specifications

• Release depth: 1.5–4 m (4.9–13.1 ft)
• Release method: Hydrostatic mechanical rod
• Replacement interval: 2 years from installation or 4 years from manufacture, whichever is earlier
• Dimensions: 2.5 x 3.4 x 2.0 in (6.3 x 8.6 x 5.0 cm)
• Weight: 3.3 oz (94 g)
• Compatible bracket families: ACR Sea Shelter, Sea Shelter 2, Sea Shelter 3, Sea Shelter 4 (confirm bracket revision)

Compatibility

For compatible ACR Category I automatic float-free EPIRB brackets of the listed Sea Shelter families. Not intended for manual-release Category II brackets or unrelated bracket mechanisms.

Installation & Use

Follow the ACR EPIRB bracket manual to safely restrain the spring-loaded release assembly during replacement. Check the manufacture date, mark the prescribed expiry, reinstall the beacon in its correct orientation and verify bracket security.

Warranty

1-Year Limited Warranty