Description
- Model: MR627
- Part Number: P89627-0-2333400-300-401-601-701
- Brand: ABB — see identification note below
- Product Family: MR627 insulation monitoring equipment
- Core Function: Continuous insulation resistance monitoring
- Product Type: Insulation Monitoring Device / Ground-Fault Monitoring Relay
- Key Specs: 10–990 kΩ response setting | DIN EN 50022 housing | AC/DC system insulation monitoring
Identification Note
There is an important brand attribution issue with this item.
The exact ordering number 89627-0-2333400-300-401-601-701 is documented in a technical selection catalog as an MR627 insulation monitoring device, with an adjustable response threshold of 10–990 kΩ and a DIN EN 50022 standard enclosure.
Other industrial listings identify MR627 as Schneider Electric / AREVA T&D equipment, rather than a conventional ABB product. A photographed MR627 nameplate also shows Schneider Electric branding and the same ordering number.
Therefore, for a procurement database, I recommend retaining the supplied ABB label only as an inventory-source designation and verifying the physical nameplate before publishing it as an ABB product.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MR627 |
| Ordering Number | P89627-0-2333400-300-401-601-701 |
| Functional Type | Insulation monitoring device |
| Monitoring Function | Insulation resistance / ground-fault monitoring |
| Response Setting Range | 10–990 kΩ |
| Housing | Standard housing according to DIN EN 50022 |
| Application | Ungrounded or impedance-grounded AC/DC systems |
| Measurement Principle | Pulse-superposition measurement |
| Display | Integrated alphanumeric display |
| Outputs | Auxiliary relay outputs; configuration-dependent |
| Test / Reset | Integrated test and inhibition controls |
| Standard Reference | DIN EN 60255-6 |
| Country Marking | Example units show Made in Poland; verify individual unit |
ABB MR627 P89627-0-2333400-300-401-601-701
The catalog specifically lists the 10–990 kΩ version under ordering number 89627-0-2333400-300-401-601-701.
Product Introduction
The MR627 P89627-0-2333400-300-401-601-701 is an insulation monitoring device intended to continuously supervise insulation conditions in electrical systems. Its documented configuration provides an adjustable response range of 10–990 kΩ and uses a standard DIN EN 50022 enclosure.
The is particularly relevant where loss of insulation needs to be detected before a developing ground fault creates a larger operational or safety problem. Available technical descriptions also identify insulation-resistance display, conductor-fault indication, test/inhibit functions, and auxiliary relay outputs.
Application Scenarios & Engineering Considerations
A device like the is not simply another protective relay. Its job is to monitor the insulation condition of the electrical system and provide an early indication of degradation.
Typical Applications
- Industrial AC/DC Power Systems
Used for continuous insulation supervision where maintaining system availability is important. - Ungrounded or IT Electrical Networks
Particularly relevant where the first insulation fault must be detected without immediately interrupting the entire supply. - Power Distribution and Control Panels
The DIN-rail style enclosure makes the specified version suitable for cabinet-mounted monitoring arrangements. - Critical Industrial Equipment
Insulation monitoring can provide early warning before an insulation fault develops into a more serious electrical event.
Engineering Note
Do not purchase by the designation alone. The ordering code determines the actual configuration. The catalog shows other variants with different response ranges and enclosure arrangements, including a 50–990 kΩ variant and a panel/enclosure version.
ABB MR627 P89627-0-2333400-300-401-601-701
Compatibility & Replacement Matrix
| Candidate | Compatibility | Engineering Note |
|---|---|---|
| P89627-0-2333400-300-401-601-701 | Direct same-part replacement | Match the full ordering number. |
| 89627-0-2333500-320-401-620-701 | Not equivalent | Different response-range/configuration code. |
| 89627-0-4333400-300-401-601-701 | Not direct | Different enclosure arrangement. |
| Generic insulation monitoring relay | Requires engineering approval | Must match measuring principle, voltage range, response threshold, outputs, and installation arrangement. |
Replacement Checks
1. Verify the complete ordering number.
The long code is not merely a sales suffix; it defines the unit configuration.
2. Confirm the monitored system voltage.
The external coupling arrangement and permissible system voltage must be checked against the installed electrical system.
3. Confirm the response threshold.
This particular ordering number is documented for 10–990 kΩ. Do not substitute the 50–990 kΩ variant without reviewing the protection philosophy.
4. Check relay output configuration.
Existing alarm and trip circuits should be compared terminal-by-terminal before replacement.
5. Verify brand and lineage from the nameplate.
For this item, this matters. The available evidence points to AREVA/Schneider Electric lineage, despite the supplied ABB inventory label.
Procurement Assessment
Identification confidence: High for the /order number; medium for the ABB brand attribution.
The exact ordering number is strongly corroborated by the catalog documentation and multiple industrial records.
For an asset-management database, the safer description is:
— P89627-0-2333400-300-401-601-701 — Insulation Monitoring Device — AREVA/Schneider Electric lineage; ABB attribution to be verified from physical nameplate.
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