Four pole (FP) isolator, 40A & 63A (switch-disconnector) — three-phase + neutral main switch, 240/415 V AC, AC-22A, for safe isolation of a board or machine.
- Switch-disconnector for on-load switching — AC-22A duty, as marked.
- Rated 240/415 V AC, 50 Hz.
- Switches all three phases and the neutral of a three-phase supply together.
- ON/OFF contact-position window and a red handle, easy to spot as the main switch.
- Does not trip on overload or short circuit — pair it with an MCB, RCCB or fuse.
- 4 modules wide; snaps onto a standard 35 mm DIN rail.
- Made in India.
An isolator — also called a switch-disconnector or main switch — cuts the supply so a board, machine or appliance can be worked on safely. This Four Pole (FP) isolator switches all three phases and the neutral of a three-phase supply together.
It is a switch, not a breaker: it does not trip on overload or short circuit, so the circuit must also be protected by an MCB, RCCB or fuse.
Ratings in this listing: 40A and 63A — choose the rating from the options.
Where to use it
- Main switch of a three-phase home, shop or office distribution board.
- Isolating three-phase machines, pumps and lifts for maintenance.
- Three-phase sub-distribution board incomer, with MCB protection upstream.
How to install
- Switch off and lock the upstream supply before working.
- Snap the isolator onto the DIN rail and connect supply and load as marked.
- Make sure the circuit is protected by an MCB, RCCB or fuse of a suitable rating.
Electrical work should be done by a licensed electrician. For AC circuits only — not for DC (solar panel) circuits.
Frequently asked questions
- What is the difference between an isolator and an MCB?
- An MCB trips automatically on overload and short circuit. An isolator is a manual on/off switch that does not trip — it is used to disconnect the supply safely, and is always paired with MCB or fuse protection.
- What does AC-22A mean?
- AC-22A is the IS/IEC 60947-3 utilisation category for on-load switching of mixed resistive and inductive loads, such as a home or shop distribution board. It describes the switching duty, not protection.
- Why a four pole isolator?
- It disconnects all three phases and the neutral together, so a three-phase board or machine is fully isolated for maintenance.
- Which isolator rating should I choose?
- Choose an isolator rated at or above the MCB or fuse that protects the circuit — for example a 63A isolator behind a 63A or smaller MCB.
Buy four pole isolators online from Electric Market, Chennai. For panel builders, contractors and bulk orders, contact us for a quote.