Description
MITSUBISHI ELECTRIC CORPORATION
AE1250-SS
AIR CIRCUIT BREAKER
MODEL: MPT-4A
ELECTRONIC TRIP RELAY
FRAME SIZE: 1250A
POLE: 3
RATED FREQUENCY: 50/60HZ
INSULATION VOLT.: 1000VAC
OPERATIONAL VOLT.: 600VAC
AMBIENT TEMP.: 45℃
SHORT TIME: 1SEC. 65KA
MADE IN JAPAN
The Mitsubishi Electric AE1250-SS is a heavy-duty air circuit breaker designed to provide overcurrent and short-circuit protection within high-capacity marine electrical distribution systems. Rated at 1250A with a 3-pole configuration and an integrated MPT-4A electronic trip relay, this unit is built to protect main and sub-main switchboard circuits aboard commercial and industrial vessels. Its robust design and electronic trip functionality ensure precise fault detection and rapid circuit isolation, maintaining operational continuity and protecting downstream equipment from damage. As a core component within the Air Circuit Breaker category, it plays a critical role in shipboard power management.
Key Features
✓ 1250A frame-rated air circuit breaker with 3-pole configuration, suitable for heavy-duty electrical distribution and main feeder protection aboard vessels.
✓ Fitted with the MPT-4A electronic trip relay, providing accurate and adjustable overcurrent, short-circuit, and fault trip response; short-time rating of 65kA for 1 second.
✓ Operational voltage of 600VAC with insulation voltage rated to 1000VAC; compatible with both 50Hz and 60Hz supply frequencies, supporting international fleet deployment.
✓ Rated for ambient temperatures up to 45°C, making it suitable for installation in engine room switchboards and main distribution panels in warm operating environments.
✓ Manufactured in Japan by Mitsubishi Electric Corporation, a recognised supplier to the marine and industrial sectors; subject to confirmation for specific panel compatibility and replacement fit.
Marine Applications
✓ Main switchboard and distribution panel protection aboard merchant vessels, tankers, and bulk carriers requiring high-capacity circuit interruption.
✓ Feeder circuit protection in engine room electrical systems, including auxiliary machinery and propulsion-related power distribution.
✓ Sub-main panel applications on offshore support vessels, platform supply vessels, and offshore installation vessels with demanding electrical loads.
✓ Power management and fault isolation duties on passenger ferries, RoRo vessels, and large yachts with complex onboard electrical architectures.
✓ Retrofit and replacement applications in existing Mitsubishi-equipped switchgear assemblies where original-specification components are required to maintain system integrity.
Why Marine Engineers Choose
The AE1250-SS is a trusted choice for marine electrical engineers who require a high-interrupting-capacity circuit breaker with electronic trip precision, proven reliability in demanding shipboard environments, and straightforward integration into existing Mitsubishi switchgear configurations.
Ideal For
Merchant vessels, tankers, bulk carriers, offshore support vessels, platform supply vessels, passenger ferries, RoRo ships, and any commercial marine application requiring robust 1250A air circuit breaker protection within main or sub-main electrical distribution systems.
Technical Support
Technical support is available for the Mitsubishi Electric AE1250-SS air circuit breaker, covering onboard installation guidance, fault diagnosis, and remote troubleshooting assistance. Support extends to electronic trip relay configuration and switchboard integration queries.
