Retrofitting VCB for discontinued MBB

Manufacturing of MBBs halted in 1985 and their replacement parts have been supplied since 1985 for around 20 years. Replacement of MBBs with new VCB (Retrofit VCB) is recommended since supply of MBB parts was discontinued at the end of 2005.

Retrofit VCB type

Existing MBB Retrofit VCB
3-DHE-10 3-DHE-16 3MV16DHE-310
3-DHE-10M 3-DHE-16M
3-DHE-25 3-DHE-40 3MV40DHE-325
3-DHE-25M 3-DHE-40M
4-DHE-25 4-DHE-32 4MV32DHE-425
4-DHE-25M 4-DHE-32M
6-DHE-13 6-DHE-15 6MV13DHE-615
6-DHE-13M 6-DHE-15M
6-DHE-20 6-DHE-25 6MV20DHE-625
6-DHE-20M 6-DHE-25M
6-DHE-40 6-DHE-50 6MV40DHE-650C
6-DHE-40M 6-DHE-50M
6-DHP-40 (Rated breaking current 40kA)(Rated current 1200A or 3000A) 6MV40DHP-650
6-DHP-40M (Rated breaking current 40kA)(Rated current 1200A or 3000A)
6-DHP-40 (Rated breaking current 43.8kA)(Rated current 1200A) 6MV44DHP-650
6-DHP-40M (Rated breaking current 43.8kA)(Rated current 1200A)
10-DHE-25(Rated current 1200A) 10-DHE-50(Rated current 1200A) 10MV25DHP-1050
10-DHP-25(Rated current 1200A)
10-DHE-40(Rated current 1200A) 10MV40DHP-1083
10-DHP-40(Rated current 1200A)

Features of Retrofit VCB

High reliability

  • The highly reliable BH-2 operating mechanism is incorporated in the Retrofit VCB.
    This operating mechanism is used in Mitsubishi’s latest VCBs.

Saving maintenance time

  • Short maintenance time: less moving parts yields a shorter working time.
  • 15 years maintenance-free BH-2 mechanism.

Full compatibility

  • Small wiring modification must be performed for cases of solenoid-operated MBBs.
  • In the case of spring-operating MBBs, retrofitting work is performed more readily.

Saving energy

  • 20% reduction in power consumption compared with the MBB.

Ratings

Retrofit VCB Type MV-S 3MV16DHE-310 3MV40DHE-325 6MV13DHE-615 6MV20DHE-625
Closing operating mechanism Motorised stored energy spring mechanism
Rated voltage (kV) 3.6 7.2
Rated current (A) 600/1200 600/1200/2000
Rated frequency (Hz) 50/60
Rated short-circuit breaking current (kA) 16 40 12.5 20
Breaking capacity(MVA) 100 250 150 250
Rated short-circuit making current (kA) 40 100 32 50
Rated short-time withstand current (kA) 16 40 12.5 20
Rated opening time (s) 0.06
Rated breaking time (cycles) 5
Power frequency withstand voltage (kV) 20
Lightning impulse withstand voltage (kV) 60
Rated operating sequence O-1min.-CO-3min.-CO
Weight (kg) 200 200/200/215
Type of interchangeable MBB 3DHE10
3DHE10M		 3DHE16
3DHE16M		 3DHE25
3DHE25M		 3DHE40
3DHE40M		 6DHE15
6DHE15M		 6DHE13
6DHE13M		 6DHE25
6DHE25M		 6DHE20
6DHE20M
  • * NOTE: Contact MITSUBISHI ELECTRIC through our distributor, if the application of ANSI standard is required.
Retrofit VCB Type MV-L 6MV44DHP-650 6MV40DHP-650 10MV25DHP-1050 10MV40DHP-1083
Closing operating mechanism Motorised stored energy spring mechanism
Rated voltage (kV) 6.6 7.2 12
Rated current (A) 1200 1200/3000 1200
Rated frequency (Hz) 50/60
Rated short-circuit breaking current (kA) 43.8 40 25 40
Breaking capacity 500 520 830
Rated short-circuit making current (kA) 110 100 63 100
Rated short-time withstand current (kA) 43.8 40 25 40
Rated opening time (s) 0.06
Rated breaking time (cycles) 5
Power frequency withstand voltage (kV) 20 28
Lightning impulse withstand voltage (kV) 60 75
Rated operating sequence O-1min.-CO-3min.-CO
Weight (kg) 280 280/350 280
Type of interchangeable MBB 6DHE50
6DHE50M		 6DHE40
6DHE40M 		6DHP40
6DHP40M		 10DHE50
10DHE50M		 10DHE25
10DHE25M		 10DHP25
10DHP25M		 10DHE40
10DHE40M		 10DHP40
10DHP40M
  • * NOTE: Contact MITSUBISHI ELECTRIC through our distributor, if the application of ANSI standard is required.

Outline and Dimensions

Series Type of Retrofit VCB A B C D E F
MV-S 3MV16DHE-310 550 920 483 186 418 216
3MV40DHE-325
6MV13DHE-615
6MV20DHE-625
MV-L 6MV40DHP-650 748 1525 695 194.5 502 254
6MV44DHP-650
10MV25DHP-1050
10MV40DHP-1083
  • * UNIT(mm)
  • * NOTE : Dimensions may be changed depending on the specification

Switchgear modification from MBB to Retrofit VCB

It needs some modification for existing Switchgear to apply the Retrofit VCB. If consider using this retrofit VCB, please contact us to confirm the contents of modification for existing Switchgear. In that case, please inform the serial number of the existing MBB and existing Switchgear.