Description
MITSUBISHI ELECTRIC CORPORATION
AE1250-SS
AIR CIRCUIT BREAKER
MODEL: M-0
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 power distribution and overcurrent protection in demanding electrical environments. Rated at 1250A with a 3-pole configuration and electronic trip relay, this unit is built to safeguard main and distribution switchboards against overload, short-circuit, and fault conditions. Its robust frame size and high breaking capacity make it well suited for marine main switchboards, generator panels, and critical power distribution circuits where reliable fault isolation is essential to vessel operations.
Key Features
✓ 1250A frame with electronic trip relay (Model M-0) providing precise and adjustable overcurrent protection across a 3-pole configuration.
✓ Rated operational voltage of 600VAC with insulation voltage of 1000VAC and dual-frequency compatibility at 50/60Hz, suitable for international vessel electrical systems.
✓ Short-time withstand current rating of 65kA for 1 second, indicating high fault-current interrupting capacity appropriate for main switchboard applications.
✓ Designed for ambient temperatures up to 45°C, making it suitable for engine room and machinery space switchboard installations typical in marine environments.
✓ Manufactured in Japan by Mitsubishi Electric Corporation, a recognised supplier to marine-grade electrical panel builders; replacement and service considerations should account for panel-specific trip settings and configuration.
Marine Applications
✓ Main switchboard and generator incomer protection on cargo vessels, tankers, and offshore support vessels.
✓ Motor control centres and feeder circuits in engine rooms where high fault-current interrupting capacity is required.
✓ Power distribution panels on passenger ferries, ro-ro vessels, and container ships operating on 600VAC electrical systems.
✓ Backup and emergency switchboard installations where reliable overcurrent isolation is critical to vessel safety and continuity of power.
✓ Industrial marine applications including floating production units and dredgers requiring robust high-amperage circuit protection.
Why Marine Engineers Choose
Marine engineers specify the Mitsubishi Electric AE1250-SS for its proven performance in high-demand electrical environments, combining a high short-circuit breaking capacity with electronic trip functionality that allows accurate fault discrimination — reducing unnecessary power loss and downtime aboard working vessels.
Ideal For
Cargo vessels, tankers, offshore support vessels, passenger ferries, container ships, ro-ro vessels, dredgers, and floating production units operating 600VAC main or distribution switchboard systems requiring 1250A-class circuit protection.
Technical Support
Technical support is available for the Mitsubishi Electric AE1250-SS air circuit breaker, covering onboard installation guidance, trip relay configuration, and remote troubleshooting assistance. Contact our team for help sourcing compatible accessories or addressing switchboard integration queries.
