Isolator is a manually-operated device used to isolate / break the circuit with the power supply. They serve as perfect companion to ensure the complete de-energisation of the electrical circuits in residential buildings and business premises.
They are typically used to interrupt the power supply for repair and maintenance work. Visually they look very similar to a MCB, but technically they are different. MCB is an automatically-operated circuit breaker for overload and short circuit protection, while Isolator is a manually-operated device for simply breaking off the circuit.
Pressfit’s Isolators come with current ratings: 40A, 63A, 100A, and 125A and rated Impulse Voltage (Uimp) of 6 kV. They are manufactured adhering to the IS/IEC 60947-3 norms.
An isolator is devised to operate under off-load conditions when the circuit is not drawing any appreciable current from the power source. They are used to isolate part of or complete the circuit with the power source to perform maintenance work. It ensures that no current flows on the load side, even if impulse voltage appears in the circuit.