Ibuki Kogyo EA4-7 Electronic Alarm AC 100V 0.2A

Ibuki Kogyo EA4-7 Electronic Alarm (General & Fire Alarm) AC 100V 0.2A

The Ibuki Kogyo EA4-7 (often referenced interchangeably as EA47) is a heavy-duty, marine-grade inboard electronic alarm designed specifically for commercial vessels, naval fleets, and offshore rigs. Manufactured in Japan by Ibuki Kogyo Co., Ltd.—a global leader in IMO/SOLAS-compliant acoustic signaling equipment—the EA4-7 functions as a dedicated sounder for General Emergency Alarm (GA), Fire Alarm, and Machinery Space Warning Systems.

Engineered to pierce through high-ambient-noise shipboard environments (such as engine rooms, pump flats, and cargo control stations), the EA4-7 operates on a stable single-phase AC 100V (50/60 Hz) supply drawing an efficient 0.2 Amperes. Its robust, flame-retardant, high-impact cast housing is sealed against harsh marine atmospheric conditions, oil mists, and aggressive vibration.

Whether utilized as an original installation or an operational replacement during dry-dock refits, this unit guarantees immediate acoustic response when integrated with bridge central fire consoles, safety automation systems, and master alarm panels.

Model Details

• Manufacturer: Ibuki Kogyo Co., Ltd. (Japan)
• Series: EA Series Marine Electronic Acoustic Transducers
• Model Number: EA4-7
• Alternative Model Designation (MPN): EA47 / EA4-7-AC100V
• Device Function: Audible Electronic Sounder / General & Fire Alarm Signaling

Technical Specifications

Key Features

1. High-Decibel Penetration: Delivers an omnidirectional sound output exceeding 105–110 dB(A) at 1 meter, ensuring complete audibility over continuous engine room background machinery.
2. Low Current Draw: Optimized solid-state internal oscillator draws just 0.2A at 100V AC, preventing voltage sag across extensive shipboard emergency cable loops.
3. Extreme Marine Durability: Salt-mist, humidity, and vibration-resistant housing engineered to endure mechanical stresses typical of marine engine platforms.
4. Fail-Safe Integration: Direct dry-contact and line-monitored activation capability for compatibility with standard fire detection panels and central alarm units.
5. Surface/Bulkhead Flange Mounting: Pre-drilled cast mounting feet facilitate direct, secure installation onto steel bulkheads and consoles.

Applications

• General Emergency Alarm (GA) Networks: Disseminates the mandatory 7 short blasts followed by 1 long blast sequence throughout accommodation spaces, alleyways, and workshop areas.
• Machinery Space Fire Alarm Systems: Deployed inside purifier rooms, main engine generator flats, boiler decks, and steering gear compartments.
• CO₂ Pre-Discharge Early Warning: Interlocked with fixed gas fire-extinguishing manifolds to sound evacuation alerts before total flooding.
• Watertight & Cargo Door Movement Alarms: Local acoustic indicator for hydraulically driven shell doors, ramp operations, and bow visors.
• Control Room & Workshop Annunciation: Audio warning for auxiliary machinery failure, bilge well high levels, and steering failure alarms.

Frequently Asked Questions

Can the Ibuki Kogyo EA4-7 be powered by 110V AC or 115V AC shipboard lines?

Yes. The internal power supply stage of the EA4-7 is rated for AC 100V (50/60 Hz) nominal, but it features a standard operational tolerance window of ±10%, allowing it to perform stably on 110V/115V AC emergency circuits.

What is the primary difference between the EA4-7 and the EA-110/EA-113S series?

The EA4-7 is the classic, highly reliable compact casting unit widely standardized on Japanese merchant vessels for general alarm and fire signaling. The EA-110 and EA-113S are newer-generation horn-style sounders offering selectable multi-tone profiles and higher directional output ratings (110–115 dB).

Does the EA4-7 require an external sound generator or tone controller?

No. The EA4-7 features an internal electronic tone oscillator. It sounds automatically as soon as the AC 100V power is delivered across its supply terminals. If intermittent general emergency signals (7 short, 1 long) are required, the timing pulses are triggered by your central master alarm controller switching the AC 100V line.

Can this unit be used outdoors on the open weather deck?

The EA4-7 is primarily rated for sheltered machinery spaces, workshops, engine control rooms, and indoor accommodation alleyways. For open weather decks exposed to green seas, an IP56/weatherproof horn-style model (such as the Ibuki EA-113S or high-output air/piston horn) is recommended.

How do I wire the EA4-7 terminal block?

Unscrew the front service cover to expose the interior terminal strip. Connect your 2-core power feed (Phase & Neutral / L1 & L2) to the line terminals, and firmly terminate the cable braided shield/ground conductor to the marked earth screw (PE). Check the housing gasket before retightening the cover screws.