Global site

ABB's website uses cookies. By staying here you are agreeing to our use of cookies. Learn more

IEC CB protection unit PR521

PR521 are self-supplied relays and ensure complete protection of the installation without auxiliary power supply

PR521 are self-supplied relays and ensure complete protection of the installation without auxiliary power supply. They are used as protection units for HD4/R - HD4/S and VD4/R - VD4/S medium voltage circuit breakers with rated voltage up to 24 kV. For these relays appropriate current sensors are provided, available in four rated current values covering all the circuit-breaker application fields. PR521 are available in two solutions:
  • PR521 (50-51 protections)
  • PR521 (50-51-51N protections)

Why ABB?
  • Self-supplied power
  • Specifically used for HD4/R - HD4/S and VD4/R - VD4/S circuit breakers

Are you looking for support or purchase information?

Loading documents

Related offering

Contact information

What would you like to do?

Submit your inquiry

Please select country from the list below
Country
Location
For this country please use ABB's partner contact details
Name
Company
E-Mail
Phone
Zip code
Your message
Cancel

Thank you for your inquiry and interest in ABB.
We will get back to you as soon as possible.

Back

An error occurred and your inquiry could not be sent.
Please try again later.

Back

Your local ABB Sales Team

Your local ABB's partner contact

Your local ABB Sales Team

Your local ABB's partner contact

Name
Address
 
Phone
 
Fax
 
E-Mail
 
 

Please select country from the list

Close

Submit your inquiry

Please select country from the list below
Country
Location
For this country please use ABB's partner contact details
Name
Company
E-Mail
Phone
Zip code
Your message
Cancel

Thank you for your inquiry and interest in ABB.
We will get back to you as soon as possible.

Back

An error occurred and your inquiry could not be sent.
Please try again later.

Back

Your local ABB Service Team

Your local ABB's partner contact

Your local ABB Service Team

Your local ABB's partner contact

Name
Address
 
Phone
 
Fax
 
E-Mail
 
 

Please select country from the list

Close

Submit your inquiry

Please select country from the list below
Country
Location
For this country please use ABB's partner contact details
Name
Company
E-Mail
Phone
Zip code
Your message
Cancel

Thank you for your inquiry and interest in ABB.
We will get back to you as soon as possible.

Back

An error occurred and your inquiry could not be sent.
Please try again later.

Back

Your local ABB Emergency Team

Your local ABB's partner contact

Your local ABB Emergency Team

Your local ABB's partner contact

Name
Address
 
Phone
 
Fax
 
E-Mail
 
 

Please select country from the list

Close

Authorized Value Providers

Close
Contact Service unavailable

ABB Web feeds

Customer events

  • Industry
  • Event