The AL-P low-voltage switchgear conforms to the latest IEC 60439-1 standard and is designed and manufactured utilising Mitsubishi Electric state-of-the-art technology, fully taking into account present and future power system requirements. Mitsubishi Electric has manufactured more than a hun thousand low-voltage switchgear panels over more than 50 year With this experience Mitsubishi Electric has gained a reputation of manufacturing up to date and reliable metal enclosed switchgear with a significant supply record to customers all of the world.

HIGH RELIABILITY • Heat stress analysis of the switchgear structure has led to a heat-resis- tant 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, re- lays 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 the last 50 years. • The reduced number of parts reduces the chance of failure. • Partitions...

• The All metal enclosure is completely earthed. Each compartment (control, air circuit breaker, busbar and cable) is segregated from other compartments by earthed metal partitions (up to Form 4b). • The front of AL-P low-voltage switchgear is divided into upper and lower compartments. The upper com- partment is the control compartment, and the lower one is the circuit breaker compartment. (See Figure Meters, control switches, etc. are semi-flush moun- ted on the door of the control circuit compartment. Figure 4-1 Front view of AL-P ©Control circuit compartment ©Air Circuit Breaker compartment...

5. PRESSURE RELIEF DEVICE FOR • A pressure relief device can be optionally installed for a further improvement of safety. • In the event of an internal arc fault, the pressure relief device, which is installed on the top of the cubicle, is forcibly operated by the rising internal pressure and Control circuit relief flap - Power cable • Depth is reduced by approximately 35% compared to • In the previous model, feeders ACBs were arranged vertically in tiers. As the horizontal busbars were situ- ated in the centre of the panel, the load cable from the top-mounted ACB was required to pass over the...

SWITCHGEAR ARRANGEMENT • Standard: IEC 60439-1: Low-voltage switchgear and controlgear assemblies ® Main busbar: Max. 5000A, Short-time current: ©Structure: FR (Front operation, Rear and front maintenance) FF (Front operation, Front maintenance) © Internal separations: Form 3a (up to Form 4b as option) ©Channel base: 50mm (It shall be add to the panel height.) ANCHOR BOLT HOLES POWER CABLE ENTRANCE SPACE CONTROL CABLE ENTRANCE SPACE * Duplex feeder: Rated diversity factor = 0.9

STANDARD DESIGN • Steel thickness is a minimum of 1.5 mm • Side cover (both ends of arrangement): Min. 2.0mm • Standard front door/rear cover 7. AIR CIRCUIT BREAKER POSITIONS Main circuit and control circuit arrangements are as follows: Connected Main and control circuit-Connected Test Main circuit-Disconnected Control circuit-Connected Disconnected Main and control - Disconnected The front door can be closed when the circuit breaker is in any position.

STANDARD DESIGN 8. CIRCUIT BREAKER INTERLOCKS

Please read the instruction manual before using the device. A MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN G-199-7-C7749-A HQ 0705 Printed in Japan (MDOC) Specifications subject to change without notice.