Why do we have a shunt trip breaker or Isolation contactor in the enclosed Altistart Softstarts (ATS23, ATS46, ATS48, ATS22)?
Issue:
We install either a Shunt trip breaker or Isolation Contactor when building an enclosed or MCC installed softstart.
Product Line:
Altistart 22 (ATS22)
Altistart 48 (ATS48)
Altistart 46 (ATS46) - obsolete
Altistart 23 (ATS23) - obsolete
Environment:
All models, all versions.
Resolution:
This is for line isolation.
All softstarts use SCR's to switch the voltage during operation.
Since the solid-state switches (SCR's) may be incapable of completely blocking incoming power should a failure occur (they will almost always fail shorted), auxiliary isolation on the line-side of the controller is required.
The isolation device must be capable of operation via command from the Fault relay of the controller.
An isolation device consisting of either a circuit breaker incorporating a shunt trip coil or an electromagnetic contactor can be used to open the controller power circuit in the event of a controller fault.
This prevents voltage and current from passing through a damaged SCR and single phasing the motor.
We install either a Shunt trip breaker or Isolation Contactor when building an enclosed or MCC installed softstart.
Product Line:
Altistart 22 (ATS22)
Altistart 48 (ATS48)
Altistart 46 (ATS46) - obsolete
Altistart 23 (ATS23) - obsolete
Environment:
All models, all versions.
Resolution:
This is for line isolation.
All softstarts use SCR's to switch the voltage during operation.
Since the solid-state switches (SCR's) may be incapable of completely blocking incoming power should a failure occur (they will almost always fail shorted), auxiliary isolation on the line-side of the controller is required.
The isolation device must be capable of operation via command from the Fault relay of the controller.
An isolation device consisting of either a circuit breaker incorporating a shunt trip coil or an electromagnetic contactor can be used to open the controller power circuit in the event of a controller fault.
This prevents voltage and current from passing through a damaged SCR and single phasing the motor.
Publisert for: Schneider Electric Norway
Trenger du hjelp?
Produktvelger
Velg riktige produkt og kompatibelt tilbehør raskt og enkelt.
Be om tilbud
Start din salgsforespørsel online, og vi vil kontakte deg.
Hvor kan du handle?
Finn din nærmeste Schneider Electric-distributør enkelt.
Hjelpesenter
Finn alle nødvendige supportressurser samlet på ett sted.