Description
TERASAKI ELECTRIC CO., LTD.
TEMPOWER 2
AR212S
3-POLE AIR CIRCUIT BREAKER
1H1407SBA
POLES: 3
FREQ.: 50/60HZ
UI: 1000V
UIMP: 12KV
MAX.: 1250A
CAT: B
AMB. TEMP.: 45°C
TYPE: AGR-21S-PRU
OVER-CURRENT RELEASE
MADE IN JAPAN
The Terasaki TemPower 2 AR212S is a 3-pole air circuit breaker rated at 1250A, designed to provide reliable over-current protection and circuit isolation within marine electrical power distribution systems. Engineered for demanding shipboard environments, this unit incorporates the AGR-21S-PRU over-current release mechanism and is built to operate across both 50Hz and 60Hz supply frequencies, making it suitable for vessels trading across international power systems. As a core component within the Air Circuit Breaker category, it plays a critical role in safeguarding main and emergency switchboards, generator panels, and high-current feeder circuits against overload and fault conditions.
Key Features
✓ Rated at 1250A maximum with a UI of 1000V and an impulse withstand voltage (UIMP) of 12kV, providing robust protection across high-capacity marine power circuits.
✓ Fitted with the AGR-21S-PRU over-current release unit, enabling reliable detection and tripping in response to sustained overload and short-circuit conditions.
✓ Compatible with 50/60Hz supply systems, offering operational flexibility for vessels operating under varying regional power standards.
✓ Rated for ambient temperatures up to 45°C, reflecting suitability for engine room and switchboard room installations where elevated operating temperatures are typical.
✓ Manufactured in Japan by Terasaki Electric Co., Ltd., a recognised supplier to the marine and industrial electrical sectors; direct replacement suitability for existing TemPower 2 panel configurations should be confirmed against original drawings.
Marine Applications
✓ Main switchboard and distribution panel installations aboard cargo vessels, tankers, and bulk carriers requiring high-current circuit protection.
✓ Generator feeder circuits on offshore support vessels, platform supply vessels, and drill ships where reliable fault isolation is operationally critical.
✓ Emergency switchboard configurations on passenger ferries and RoPax vessels where circuit breaker integrity underpins compliance with power continuity requirements.
✓ High-load feeder protection for propulsion-related auxiliary systems, including bow thrusters, winch drives, and HVAC distribution panels.
✓ Retrofit and like-for-like replacement applications on vessels already equipped with Terasaki TemPower 2 series switchgear, subject to configuration verification.
Why Marine Engineers Choose
The Terasaki TemPower 2 AR212S is a well-established platform within marine switchgear, valued for its robust construction, consistent tripping performance, and suitability for the thermal and electrical demands of shipboard power distribution environments.
Ideal For
Cargo ships, bulk carriers, tankers, container vessels, offshore support vessels, passenger ferries, cruise ships, and any commercial vessel type operating Terasaki TemPower 2 series switchgear in main or emergency power distribution systems.
Technical Support
Technical support is available for this air circuit breaker and the TemPower 2 series, covering onboard installation guidance, over-current release configuration, and remote troubleshooting assistance. Support can be provided to assist engineers during replacement or commissioning activities.
