Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | RXIDK 2H |
| Order number | 1MRK000838-HA |
| Product type | Time-overcurrent measuring relay |
| Rated current | 5 A variant, according to catalog order-code listing |
| Rated frequency | 50–60 Hz |
| Protection function | Time-overcurrent protection |
| Protection characteristics | Confirm supported curves and settings from the applicable relay documentation |
| Earth-fault function | Confirm the specific relay configuration and external circuit arrangement |
| Supply voltage | Not independently verified for this order variant |
| Output contact ratings | Verify from the applicable technical documentation |
| Mounting / assembly | Associated with ABB COMBIFLEX modular protection equipment |
| Operating temperature | Not verified for this exact order code |
| Condition | Confirm with supplier |
Application Scenarios & Pain Points
- Feeder overcurrent protection: Detect excessive current and initiate the configured protection response when the measured current and timing criteria are met.
- Legacy switchgear maintenance: Source a matching relay when the installed protection equipment remains in service but the original unit has failed.
- Protection coordination: Preserve the intended time-current coordination with upstream and downstream devices; settings must be checked after replacement.
- Spare-parts planning: Confirm the order-code suffix, current input rating, wiring diagram, and available test documentation before committing to a shutdown schedule.
A common retrofit risk is assuming that a relay with the same family name has the same current input. In a 5 A CT secondary circuit, a mismatch can compromise protection performance or prevent correct operation. Confirm the rating from the nameplate and approved drawings.
RXIDK 2H 1MRK000838-HA
Related Products
These models belong to related ABB protection-relay families or catalog categories. They are not automatically interchangeable with RXIDK 2H.
- RXIDK 2H — Time-overcurrent relay family; confirm the complete order code and rated current.
- RXIDG 21H — Related overcurrent-relay family listed in ABB relay catalog material; check its specific protection function before comparison.
- RAIDK — Related relay family appearing in the same protection catalog; application and configuration must be verified.
- RAIDG — Related protection-relay family; not a direct replacement without documentation.
- RXPPK 2H — ABB reverse-power protection relay family for a different protection function; not a substitute for overcurrent protection.
- COMBIFLEX protection assemblies — Modular protection equipment context; confirm the assembly, wiring, and relay position.
- ABB current transformers (CTs) — Confirm that the secondary rating and ratio match the relay’s intended input.
- ABB relay test switches — Verify the existing test-switch arrangement and terminal wiring before replacing components.
The Engineer’s Guide
Trap 1: Overlooking the 5 A rating
Warning: The HA suffix is associated with the 5 A version in the cited catalog listing. Do not order by the RXIDK 2H family name alone.
Practical tip: Compare the full order number with the installed relay and approved drawings. If the existing circuit uses a different CT secondary rating, stop and confirm the required variant.
Trap 2: Assuming identical protection settings
Two relays in the same family may not have the same current rating, time-current behavior, or application configuration.
Practical tip: Record the original pickup settings, time delays, and protection coordination requirements. Have qualified protection personnel verify the settings and perform the required injection tests after replacement.
Trap 3: Treating a physical fit as proof of electrical compatibility
A relay that fits the assembly can still have different terminal assignments or functional characteristics.
Practical tip: Match the terminal diagram, relay code, current input, and circuit drawings. Do not energize the protection circuit until the replacement has passed the required checks.
Frequently Asked Questions
1. What is the ABB RXIDK 2H 1MRK000838-HA used for?
It is a time-overcurrent protection relay variant used in protection applications. The relay responds to measured current according to its configured operating characteristics. Confirm the installed protection scheme and exact settings before specifying its role in a particular feeder or switchgear panel.
2. What does the HA suffix mean on 1MRK000838-HA?
The cited relay catalog associates 1MRK000838-HA with the 5 A rated-current version of RXIDK 2H for standard 50–60 Hz service. Do not interpret the suffix as a generic hardware revision without checking the order-code documentation.
3. Can RXIDK 2H replace RXIDG 21H?
Do not assume direct compatibility. They are related relay families, but the protection function, input configuration, and wiring must match the application. Obtain documented interchangeability confirmation before replacing one with the other.
4. Is the RXIDK 2H suitable for a 1 A current-transformer secondary?
The specified 1MRK000838-HA variant is listed as a 5 A version, so it should not be treated as the 1 A version. The catalog lists other order-code variants; select the one required by the installed CT circuit and protection design.
5. What should be checked before installing a replacement relay?
Verify the complete order number, rated current, frequency, terminal connections, current-transformer wiring, protection settings, and applicable circuit diagram. After installation, qualified personnel should carry out the prescribed secondary-injection and trip-circuit tests.
6. How can I confirm the condition and authenticity of a supplied relay?
Request photographs of the actual unit and nameplate, traceability information where available, and a written statement of condition. If the unit is described as tested, ask what the test covered and whether the results can be supplied. Packaging or appearance alone does not prove authenticity or operational condition.
7. What are the lead time and warranty for ABB RXIDK 2H 1MRK000838-HA?
Lead time and warranty depend on the specific supplier and unit. Request written confirmation of stock status, condition, dispatch estimate, warranty duration, and return terms. For legacy protection equipment, allow time to verify the exact order code and test the relay before the planned outage.
