Four pole (FP) MCB-type changeover switch, 40A and 63A — moves a three-phase + neutral load between mains and a generator; 40A marked 240/415 V, 50 Hz.
- Switches a three-phase + neutral load between two supplies — mains (EB) and a generator, or a second supply.
- Four pole: the three phases and the neutral change over together, keeping the two supplies completely separate.
- Rated 40A or 63A; the 40A unit is marked 240/415 V, 50 Hz.
- Handles joined by a common bar, so all four poles always move together.
- A window on each pole shows which line is selected.
- Connection diagram on the front: a common terminal and two changeover terminals for each pole.
- A switch, not a breaker: it does not trip, so each supply needs its own MCB or fuse.
A changeover switch lets a load run from one of two supplies, never both at once, so a generator cannot feed back into the mains line and the mains cannot reach the generator. This one is built in an MCB-style body that fits the DIN rail of a distribution board or enclosure.
All four poles — three phases and neutral — change over together, keeping the neutrals of the two supplies separate. Each pole has a common terminal (1, 5, 9 and 13) and two changeover terminals (2 and 4, 6 and 8, 10 and 12, 14 and 16), as printed on the front. Ratings in this listing: 40A and 63A.
Where to use it
- Three-phase homes, shops and offices with a generator (mains and DG set).
- Three-phase pumps, machines and essential loads on a standby supply.
- Choosing between two three-phase + neutral supplies.
- Workshops and small commercial buildings.
How to install
- Switch off and isolate both supplies before starting.
- Snap the changeover onto the DIN rail of the distribution board or enclosure.
- Connect the outgoing load to the common terminals and each supply to its own changeover terminals as the printed diagram shows — neutral on the same pole for both supplies.
- Keep the same phase order (R, Y, B) on both supplies, so motors turn the same way on either supply.
- Protect each supply with its own MCB or fuse and label the two lines.
Electrical work should be done by a licensed electrician. Never connect a generator to building wiring without a changeover switch.
Frequently asked questions
- What is a four way MCB changeover switch?
- A four pole changeover in an MCB-style body that moves a three-phase + neutral load between two supplies, such as mains and a generator. "Four way" refers to its four poles — three phases and neutral.
- Why keep the same phase order on both supplies?
- If the generator phase sequence differs from the mains, three-phase motors and pumps run backwards on one of the supplies. Wire R, Y and B identically on both sides.
- Does a changeover switch protect my wiring?
- No. It is a switch only — it does not trip on overload, short circuit or earth leakage. Keep an MCB or fuse on each supply and an RCCB for shock protection.
- 40A or 63A — which do I need?
- At least the rating of the main MCB or fuse of the supplies it switches: 40A for a three-phase main of up to 40A, 63A for up to 63A.
- Is it an automatic changeover?
- No. It is a manual switch: you move the handle when the supply changes. Automatic changeover needs an automatic transfer switch or a changeover contactor panel.
- Can I change over with the load on?
- Switch off heavy loads such as ACs, pumps and geysers first; changing over under heavy load wears the contacts faster.
Buy four pole MCB changeover switches online from Electric Market, Chennai. For site, contractor or bulk quantities, contact us for a quote.
Specifications
- Product
- MCB-type manual changeover switch
- Poles
- Four pole (FP) — three phases and neutral
- Rated Current
- 40A and 63A (select option)
- Marked Voltage
- 240/415 V, 50 Hz (40A unit)
- Indication
- Window on each pole shows the selected line
- Terminals
- Common 1, 5, 9, 13; changeover 2/4, 6/8, 10/12, 14/16
- Operation
- Manual; handles joined by a common bar
- Protection
- None — MCB or fuse on each supply
- Mounting
- DIN rail, in a distribution board or enclosure
- Origin
- Made in India (marked on the side)