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An isolator is an off-load device; it can only be operated when the current flowing is zero i.e., when the power supply is off. While a circuit breaker is an on-load device; it can operate perfectly when the power supply is on.

Load break switches are devices used to open an electrical circuit by isolating the source from the consumer. Whether they are manual, motorised or with a trip function, these devices ensure the on-load making, breaking and safety disconnection of low-voltage electrical circuits.

Load interrupter switches should not be used to interrupt load currents above their interrupting rating of 600 A or 1200 A, as they are not designed nor tested for interrupting fault currents on electrical systems .

The load break switch makes, breaks, and carries currents. The disconnector acts as a safety measure; it isolates a part or the whole of a circuit and prevents current from flowing through; this is done to prevent hazards during inspection, maintenance, and repair.

To ensure safe operation, it is important to select a switch with appropriate ratings for the system voltage level, short-circuit rating (Ik) and rated load current. Other factors such as environmental conditions should also be taken into consideration when selecting an MV LBS.

A load break switch or LBOR switch is an ?on / off? switch, similar to an ?on / off? light switch in your house. A load break switch is designed to switch the power ?on or off? or change the position when the transformer is energized (meaning it has a load on it)?the switch will break this load.

By contrast, a load-break rated disconnect is a disconnect that can open a circuit while current is going through it (while it's on). Load-break rated disconnects are used to turn whole systems off, and they can get expensive ? which is one reason to use a non-load break rated disconnect that doesn't interrupt current.