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, with delivery across India from our Chennai store. 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)