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 for high-current protection duties within marine control systems. Rated at 1250A with a 3-pole configuration and an integrated MPT-1 electronic trip relay, it provides reliable overcurrent, short-circuit, and fault protection for main and branch distribution circuits onboard vessels. Its robust design and high interrupting capacity make it a critical component in shipboard electrical distribution, safeguarding equipment and personnel against fault conditions in demanding marine environments.
Key Features
✓ 1250A frame air circuit breaker with integrated MPT-1 electronic trip relay for precise, adjustable fault protection across marine distribution circuits.
✓ Rated operational voltage of 600VAC with insulation voltage of 1000VAC, suitable for typical shipboard low-voltage distribution systems; rated frequency 50/60Hz for global fleet compatibility.
✓ Short-time withstand rating of 65kA for 1 second, providing high fault current tolerance appropriate for main switchboard and power distribution panel applications.
✓ Designed for operation in ambient temperatures up to 45°C, reflecting suitability for engine room and machinery space electrical enclosures common in marine installations.
✓ Manufactured in Japan by Mitsubishi Electric Corporation, a recognised supplier to the marine and industrial sectors, supporting straightforward like-for-like replacement in existing panel configurations.
Marine Applications
✓ Main and emergency switchboard feeder protection on commercial cargo vessels, tankers, and offshore support vessels requiring high-capacity circuit breaking.
✓ Power distribution panels in engine rooms and machinery control rooms where reliable fault isolation is essential to continuous vessel operation.
✓ Feeder and bus-tie circuit protection on passenger ferries, RoRo vessels, and cruise ships with complex onboard electrical distribution networks.
✓ Shore power connection panels and generator output breaker positions on vessels where robust, high-rating air circuit breakers are specified.
✓ Replacement duty on existing Mitsubishi Electric switchgear installations across a wide range of vessel types operating on both 50Hz and 60Hz systems.
Why Marine Engineers Choose
The AE1250-SS is a well-established air circuit breaker from Mitsubishi Electric, valued for its high interrupting capacity, electronic trip precision, and proven reliability in shipboard electrical environments where unplanned outages carry significant operational consequences.
Ideal For
Cargo vessels, tankers, offshore platforms, passenger ferries, RoRo vessels, dredgers, and any commercial or industrial marine application requiring a high-capacity 1250A air circuit breaker within a low-voltage distribution or marine control system.
Technical Support
Technical support is available for this air circuit breaker and its associated marine control system application, covering onboard installation guidance, trip relay configuration, and remote troubleshooting assistance. Contact our team to discuss your specific requirements.
