ABB RXPDK 21H 1MRK000844-BB
ABB RXPDK 21H 1MRK000844-BB
ABB RXPDK 21H 1MRK000844-BB
ABB RXPDK 21H 1MRK000844-BB
ABB RXPDK 21H 1MRK000844-BB
ABB RXPDK 21H 1MRK000844-BB
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RXPDK 21H 1MRK000844-BB

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ABB RXPDK 21H 1MRK000844-BB is a 5 A directional time-overcurrent relay with a delayed directional stage and a separate non-directional instantaneous stage. It supports selective fault protection in networks with multiple sources.
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Technical specifications for RXPDK 21H 1MRK000844-BB

  • Manufacturer:
    ABB
  • Part Number:
    RXPDK 21H 1MRK000844-BB
  • Product Family:
    ABB Electrical
  • Product Type:
    Directional Time-Overcurrent Relay
  • Stock:
    1
  • Ordering number:
    1MRK000844-BB
  • Rated current:
    5 A execution
  • Low-set stage:
    Directional, time-delayed I> stage
  • High-set stage:
    eNon-directional instantaneous I>> stagee
  • Auxiliary supply:
    +24 V DC through the required RXTUG DC/DC converter
  • Test connector:
    RTXK automatic shorting test connector arrangement
  • Application:
    Directional overcurrent protection in relay protection schemes
  • Polarizing function:
    Directional comparison for the I> stage
  • Protection stages:
    Delayed I> and instantaneous I>>
  • Tariff Code:
    85364900
  • Country of origin:
    Sweden
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Applications Monitoring & Control Protection Safety & Compliance

Features:

  • Identifies the 5 A RXPDK 21H execution by ABB ordering number 1MRK000844-BB.
  • Combines a directional delayed stage with a non-directional instantaneous stage.
  • Uses the RXTUG converter to provide the relay's required +24 V DC auxiliary supply.
Ordering number 1MRK000844-BB identifies the 5 A RXPDK 21H relay execution.

It evaluates current direction for the delayed stage while retaining a separate rapid high-set overcurrent element.

Match CT secondary, polarizing circuit, relay base, RXTUG converter and test-switch arrangement before replacement.

Relay supply is checked against the 5 A execution, base and auxiliary-converter arrangement.
Verified resources for ABB RXPDK 21H 1MRK000844-BB:Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Provide directional feeder protection where fault current may flow from multiple sources.
  • Add an instantaneous high-set stage for severe overcurrent conditions.
  • Integrate tripping and signalling contacts into a COMBIFLEX protection panel.
  • The I> stage compares operating current with a polarizing quantity.
  • Operation is permitted only when the measured fault lies in the selected direction.
  • The directional element supports selective protection in interconnected networks.
  • The low-set I> element operates with the configured time delay.
  • The high-set I>> element is non-directional and acts without intentional delay.
  • Output contacts feed the external trip, alarm, or interlocking circuit.
  • RXTUG provides the documented +24 V auxiliary supply to the relay.
  • RTXP and RT XK test hardware protects current circuits during test and withdrawal.
  • The 5 A rating must agree with the connected CT secondary.
Description
RXPDK 21H 1MRK000844-BB is used where overcurrent magnitude alone is not sufficient and the fault direction must also be known. The directional low-set stage supports selective protection in networks where current can flow from more than one source.

The relay compares the measured operating current with the polarizing quantity to determine whether the fault lies in the selected direction. If the directional condition and the I> pickup/timing settings are satisfied, the delayed stage operates; the I>> stage provides a separate high-set, non-directional rapid operation.

The relay's output contacts and indications are used by the protection scheme for tripping, signalling or interlocking according to the wired application. The relay does not define the complete trip circuit, so external DC supply, output-contact duty and breaker interface must follow the panel drawings.
Alternative Names
RXPDK 21H 1MRK000844-BB RXPDK21H 1MRK000844BB ABB RXPDK-21H ABB RXPDK 21H ABB 1MRK000844-BB ABB RXPDK Directional Overcurrent Relay ABB COMBIFLEX RXPDK21H 5A
Technical notes
RXPDK 21H 1MRK000844-BB uses CT circuits and an RXTUG-supplied +24 V auxiliary path; apply the RTXP/RTXK test procedure before relay removal.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why does ABB RXPDK 21H 1MRK000844-BB need a polarizing quantity?
The delayed I> stage uses it with operating current to determine whether the fault is in the selected direction.
How does the I>> stage differ on ABB RXPDK 21H 1MRK000844-BB?
I>> is a separate non-directional high-set element intended for rapid response to severe overcurrent.
Which converter supplies ABB RXPDK 21H 1MRK000844-BB?
The documented arrangement uses an RXTUG DC/DC converter to provide the relay's +24 V auxiliary supply.
What is the function of RTXP/RTXK hardware with ABB RXPDK 21H 1MRK000844-BB?
It provides the approved testing and automatic current-circuit shorting arrangement for safer relay service.
Could a 1 A RXPDK replace ABB RXPDK 21H 1MRK000844-BB?
No direct swap should be assumed; this ordering number is the 5 A execution and must match the CT secondary and protection settings.
What panel information is required to source ABB RXPDK 21H 1MRK000844-BB?
Supply the relay and base labels, CT ratio, polarizing source, RXTUG/RTXP details, settings, quantity and destination.