The MDB then feeds SMDBs which are installed midway through the power distribution system at a point where the large distribution cable terminates and several smaller sub-circuits begin. These switchboards are larger than a final distribution board circuit although they have similar construction process.

Key features of SMDB – Sub Main Distribution Boards

• Fully type tested assemblies as per IEC 61439-1
• Rated upto 1250A
• Rated operating voltage upto 690V
• Manufactured in Form 2 & Form 4 construction
• Type tested for 50kA/1 sec
• Ample cabling space for easy connections
• Top and bottom cable entry
• Panels for front or rear access to suit the application
• Index of protection : IP 31 & IP 54
• Wall mounting or free standing to suit the application