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Addressable short circuit isolator Fire alarm systems Fault

  • Addressable short circuit isolator Fire alarm systems Fault

Addressable short circuit isolator Fire alarm systems Fault

Price :
$14.50
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  • Model: FT-957
  • Shipping Weight: 0.2kgs
  • 500 Units in Stock
  • Manufactured by: HST fire alarm

DESCRIPTION

FT 957 short circuit isolators are used for the short circuit fault protection of buses. When a bus circuit is operating normally, the FT 957 short circuit isolator will not operate; when a short circuit fault occurs at a place at the output end of the short circuit isolator in the bus circuit (short circuit current >200mA), the section suffering the short circuit fault will be cut off from the bus, thus ensuring the normal communication of the other sections of the bus. Upon elimination of the short circuit fault, the short circuit isolator can automatically bring the isolated section into the system again. A short circuit isolator will make it convenient to confirm the location suffering a short circuit fault. The short circuit isolator does not need coding nor occupies the address in the bus circuit.
Main technical parameters
1.Mode of operation: Nonpolar two-wire system
2.Quiescent current: <5.0mA
3.Operative current: >200mA
4.Operation indicator: Red (It is out in the normal monitoring status or remains lit in the operation status)
5.Operating environment: Temperature: -10C~50C; relative humidity: <=95% (40C±2C, without condensation)
6.External dimensions: 86×86×40mm (with the base)
7.Weight: about 125g (with the base)
Terminal description:
1.It is recommended to arrange 32 or less intelligent detectors (or intelligent modules) at the output end of a short circuit isolator.
2.The concatenation application of multiple short circuit isolators is not supported. If such concatenation is done, the shorting of the end of the post stage short circuit isolator will make the short circuit isolators keep operating and restoring and the bus operating abnormally.
3.If the controller is reset after a short circuit occurs within 10 seconds or the output end of the short circuit isolator is shorted, the short circuit isolator may first restore for about one second after it starts to operate and then maintain the operation status.
4.In case of a slight short circuit fault in the bus circuit, the short circuit isolator will not always start to operate as it will start to operate when the short-circuit current of the load is larger than the design value. So, if the short circuit isolator is not operating, it cannot be evidence that there is no slight short circuit fault in the bus circuit.