Description
MITSUBISHI ELECTRIC CORPORATION
AE1250-SS
AIR CIRCUIT BREAKER
MODEL: MPT-1
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 reliable overcurrent and short-circuit protection within marine and industrial power distribution systems. Rated at 1250A with a 3-pole configuration and an integrated electronic trip relay (Model MPT-1), this breaker is built to handle the demanding protection requirements found in main switchboards, distribution panels, and generator feeder circuits aboard commercial and offshore vessels. As a core component within a ship’s electrical system, it plays a critical role in safeguarding onboard power infrastructure against fault conditions that could compromise vessel safety and operational continuity.
Key Features
✓ 1250A frame-rated 3-pole air circuit breaker with integrated MPT-1 electronic trip relay, delivering precise and responsive overcurrent protection for high-current marine distribution circuits.
✓ Rated for 600VAC operational voltage with 1000VAC insulation voltage and a short-time withstand rating of 65kA for 1 second, reflecting robust fault current tolerance suitable for demanding shipboard electrical environments.
✓ Compatible with 50/60Hz electrical systems and rated for ambient operating temperatures up to 45℃, making it well-suited for engine rooms, switchboard rooms, and other thermally challenging onboard locations.
✓ Manufactured in Japan by Mitsubishi Electric Corporation, supporting confidence in build quality and long-term reliability within critical power protection applications typical of marine classification requirements.
✓ Replacement and maintenance planning should account for electronic trip relay calibration and breaker frame condition; compatibility with existing switchboard configurations should be confirmed prior to installation.
Marine Applications
✓ Main and emergency switchboard feeder protection on merchant vessels, tankers, bulk carriers, and offshore support vessels where high-capacity circuit breaking is essential.
✓ Generator incomer and bus-tie breaker positions in shipboard power management systems requiring reliable fault isolation and load shedding capability.
✓ Shore power connection panels and transformer secondary protection circuits aboard vessels with high shore-side power demand during port operations.
✓ Offshore platforms and floating production units where electrical distribution reliability directly impacts safety-critical and production-critical systems.
✓ Retrofit and like-for-like replacement applications within existing Mitsubishi Electric switchgear assemblies, where maintaining OEM component compatibility is a priority for electrical maintenance teams.
Why Marine Engineers Choose
Marine engineers specify the Mitsubishi Electric AE1250-SS for its well-established performance in high-current protection roles, the reliability of its electronic trip relay system, and the confidence that comes with a Japan-manufactured product from a globally recognised electrical equipment manufacturer.
Ideal For
Merchant vessels, bulk carriers, tankers, container ships, offshore support vessels, drilling units, floating production platforms, and any marine or industrial installation requiring dependable 1250A-rated air circuit breaker protection within a 600VAC distribution system.
Technical Support
Technical support is available for the Mitsubishi Electric AE1250-SS air circuit breaker, covering onboard installation guidance, trip relay configuration, and remote fault-finding assistance. Support extends to replacement planning and integration within existing marine switchboard assemblies.
