Isolation switches
Choosing the right switch
A correct installation of a isolation switch is essential for operational reliability, personal safety, and product longevity. When selecting a switch, it is important to consider the installation environment and the enclosure material, as different materials have different properties and react differently to environmental conditions.
Factors to consider:
- IP rating:
Choose the IP rating based on the environment in which the switch will be installed – not out of habit. A high IP rating does not automatically mean the switch is suitable for outdoor use.
- Mounting location:
Consider environmental influences such as sunlight, rain, snow, dust, vibration, temperature variations, and any potential mechanical stress. Install the switch in a location that offers as much protection and stability as possible.
- Risk of condensation:
Be aware of the risk of condensation, especially where temperature fluctuations occur. If possible, position the switch to minimize condensation – for example, avoid areas with rapid temperature changes.
Correct application according to standards
Enclosed load disconnectors/isolation switches compliant with IEC 60947-3 are also approved for use as safety switches where required. According to current regulations, a safety switch must be connected in the main circuit in order to:
- isolate parts of the installation during mechanical or electrical work, and
- prevent unintentional reconnection of the installation while work is in progress.
Since a safety switch should only be used for isolation purposes, the electrical circuit of the installation must also include separate switching devices for start and stop functions.
A load disconnector/isolation switch according to IEC 60947-3 can therefore be used both as a safety switch and as a separate switching device, depending on the requirements of the installation.