7 segment phase segregated distribution board — each phase in separately covered compartments behind two outer doors. 4, 6, 8 and 12 way.
- Phase segregated: the board is divided into separately covered compartments, so the MCBs of different phases are kept apart.
- Each compartment has its own screw-fixed cover with an MCB window and a numbered label strip.
- Two outer door leaves with latches close over the whole board.
- ON/OFF marking on the cover and black corner caps on the frame.
- Sizes of 4, 6, 8 and 12 ways — in three-phase boards the way count is usually per phase.
- Electrical warning label on the outer door.
- Sold empty — the incomer, RCCB and MCBs are chosen for your load and bought separately.
A phase segregated DB is a three-phase (TPN) distribution board in which the MCBs of each phase are kept in their own covered compartment instead of sharing one long row. MCBs of different phases — with about 400 V between them — stay apart, each phase's circuits are easy to trace, and one compartment can be opened for work while the others stay covered.
"7 segment" is the name of this segmented design; the compartment layout changes with the way size you choose. It is the premium choice for villas, large homes, offices, schools and hospitals on a three-phase supply.
What goes in a phase segregated DB
- Incomer: a four pole (TP+N) MCB, four pole isolator or 4-pole RCCB.
- SP MCBs for each phase's single-phase circuits, in that phase's compartment.
- TP or TP+N MCBs for three-phase loads such as pumps and motors.
Your electrician allots the compartments and balances the load across R, Y and B.
Where to use it
- Villas and large homes with a three-phase connection.
- Offices, banks, schools and hospitals.
- Commercial buildings and showrooms where phases are kept apart for safe maintenance.
How to install
- Plan the incomer and each phase's circuits with your electrician.
- Fix the board firmly to a solid wall, level and at an accessible height, away from water.
- Fit the incomer and MCBs in their compartments, connect the phases, neutral and earth as marked, and tighten every terminal.
- Refit each compartment cover, close unused openings with blanking plates, label the circuits and close the doors.
Three-phase work should be done by a licensed electrician with the supply switched off. The board itself does not protect anything — protection comes from the MCBs and RCCB fitted in it.
Frequently asked questions
- What does phase segregated mean?
- The MCBs of R, Y and B sit in separate covered compartments instead of side by side on one rail. Different phases stay apart, circuits are easier to trace, and one section can be worked on while the rest stay covered.
- What does 7 segment mean?
- It is the name of this segmented design, in which the board is divided into separately covered compartments. The exact layout depends on the way size you choose.
- What does 4 way mean in this DB?
- Usually per phase — a 4 way board typically takes four SP MCBs for each of R, Y and B. Send us your circuit list if you need help choosing the size.
- Phase segregated DB or normal three phase DB — which should I choose?
- A normal three phase DB is more compact. A phase segregated DB takes more wall space but keeps the phases apart and is easier to maintain safely — often preferred for larger homes and commercial buildings.
- Are MCBs included?
- No. The board is sold empty — see our four pole MCBs, isolators and RCCBs for the incomer, and SP MCBs for the circuits.
- Do I need an RCCB as well?
- For homes, yes: the CEA safety regulations (2023) call for a residual current device of 30 mA or less in domestic installations. An RCCB trips on earth leakage to protect people from shock, which MCBs do not do.
Buy 7 segment phase segregated DBs online from Electric Market, Chennai. For site, contractor or bulk quantities, contact us for a quote.