Description
TERASAKI
TYPE: AH-20CH
AIR CIRCUIT BREAKER
IEC: 2000A
FREQ: 50/60HZ
RULE CURRENT: A
CT RATIO: 3
SHORT-TIME CURRENT: 70KA 1SEC.
The Terasaki AH-20CH is a heavy-duty air circuit breaker rated at 2000A, designed to provide reliable overcurrent and short-circuit protection within marine power distribution systems. With a short-time current rating of 70kA for 1 second and dual-frequency compatibility at 50/60Hz, this unit is built to handle the demanding electrical loads found aboard commercial and industrial vessels. As a core component within the Marine Control System category, it plays a critical role in safeguarding switchboards, generator panels, and main distribution boards from fault conditions that could compromise vessel operations.
Key Features
✓ Rated at 2000A with a short-time withstand current of 70kA for 1 second, providing robust fault protection in high-load marine environments.
✓ Compatible with both 50Hz and 60Hz electrical systems, making it suitable for vessels operating across different international power standards.
✓ CT ratio of 3 supports accurate current measurement and protection relay coordination within switchboard and distribution panel configurations.
✓ Designed for integration into marine main switchboards and power distribution panels — installation context and mounting configuration subject to confirmation based on vessel setup.
✓ Direct replacement or upgrade consideration for existing Terasaki AH-series breakers; compatibility with specific panel configurations should be verified prior to installation.
Marine Applications
✓ Main switchboard protection on cargo vessels, bulk carriers, and tankers where high-amperage distribution circuits require reliable fault interruption.
✓ Generator feeder protection in engine rooms aboard offshore support vessels and platform supply vessels.
✓ Bus-tie and section breaker duties within marine power management systems on larger commercial vessels.
✓ Shore power and distribution panel protection on cruise ships, ferries, and RoRo vessels with complex electrical load requirements.
✓ Emergency and essential services distribution boards where dependable overcurrent protection is critical to vessel safety and continuity of operations.
Why Marine Engineers Choose
Terasaki air circuit breakers are a trusted name in marine electrical protection, widely specified by shipbuilders and electrical engineers for their robust construction, proven performance in marine-grade environments, and straightforward integration into existing switchgear configurations. The AH-20CH combines high interrupt capacity with dual-frequency flexibility, making it a practical choice for fleet operators managing vessels across global trades.
Ideal For
Cargo ships, bulk carriers, tankers, offshore support vessels, platform supply vessels, ferries, RoRo vessels, cruise ships, and any commercial or industrial vessel requiring high-capacity air circuit breaker protection within main or essential services distribution systems.
Technical Support
Technical support is available for the Terasaki AH-20CH Air Circuit Breaker and related marine control system components. Assistance covers onboard installation guidance, fault diagnosis, and remote troubleshooting to help minimise vessel downtime.
