High Reliability

  • Heat stress analysis of the switchgear structure has led to a heat-resistant design in which circuit breakers up to 5000A are self-cooled (i.e.cooling fans not required).
  • All components, such as current transformers, voltage transformers, relays and meters, are made of the highest quality materials.
  • AL-P low-voltage switchgear are designed with the benefit of Mitsubishi's vast switchgear and circuit breaker production experience of in excess of one hundred thousand panels over last 50 years.
  • The reduced number of parts reduce the chance of failure.


  • Partitions between compartments and an automatic shutter system completely isolate live parts.
  • The pressure relief device which is installed optionally releases hot gas upwards in the event of an internal arc fault for operator's safety.

Easy Handling

  • Control switches are installed at a height appropriate for easy viewing and operation.
  • Installation and testing duration are considerably reduced as the switchgear is tested and adjusted in the factory and then delivered as a complete unit.

Flexible Design

  • Panels with main circuit and control cable entry from either top or bottom are available.
  • The AL-P is readily combined with Mitsubishi Electric‘s Motor Control Center (MCC). The combined arrangement has advantages such as compact size and a simplified overall structure. As the MCC utilizes a double-front design, a larger number of motor starter units can also be accommodated. The AL-P is the perfect complement for Mitsubishi's MCCs. (Further information regarding Mitsubishi's MCCs can be found in a separate publication.)

Standard Ratings


Standard IEC 60439-1 Low-voltage switchgear and controlgear assemblies
Rated insulation voltage 1000VAC
Rated voltage 690VAC
System 3φ3W / 3φ4W (4P ACB or 3P ACB with removable link) N Phase bus is half capacity.
Rated busbar current (Horizontal) 630-5000A
Rated frequency 50/60Hz
Short-time withstand current (Horizontal bus) 50, 65, 75, 85, 100kA 1-3s
Withstand voltage Main circuit 3500V
Control circuit 1500V


Standard IEC 60947-2 Low-voltage switchgear and controlgear Part 2: Circuit breakers
Rated insulation voltage 1000VAC
Rated voltage 690VAC
NOS pole 3P/4P
Connection type Main circuit Automatic connection
Control circuit Automatic connection
Kinds of position Connect-Test-Disconnect