Transfer switching equipment (TSE) is classified according to the short-circuit capability:
There are three different types of transfer switching equipment:
- Automatic Transfer Switching Equipment (ATSE)
- Manually Transfer Switching Equipment (MTSE)
- Remotely Transfer Switching Equipment (RTSE)
Of the ATSE type, there are three different classes of transfer switching equipment:
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Class CC: Is a TSE that is capable of making and withstanding, but is not intended for breaking short-circuit currents and is based on devices fulfilling the requirements of IEC 60947-4-1. This is usually by use of interlocked contactors.
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Class PC: Is a TSE that is capable of making and withstanding, but is not intended for breaking short-circuit currents and is based on devices fulfilling the requirements of IEC 60947-3. This is usually by use of a motorised switching device.
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Class CB: Is a TSE that is capable of making, withstanding and is intended for breaking short-circuit currents and is provided with over-current releases and is based on devices fulfilling the requirements of IEC 60947-2. This is usually by use of motorised circuit breakers.
** Standard PC, Utility PC and Budget ATS utilise a Chinese device which conforms to GB/T 14048.11-2016. This is the Chinese version of the IEC 60947-6-1. It is not fully compatible to the latest IEC standard but a modified version labelled IEC 60947-6-1:2013, MOD
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Life Safety ATS - Class CC/PC
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Premium ATS - Class CC/PC
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Standard ATS - Class CC/PC**
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Utility ATS - Class PC**
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Budget ATS - Class CB**
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