ABB MB21
ABB MB21
ABB MB21
ABB MB21
ABB MB21
ABB MB21
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MB21

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ABB MB21 is a Hartmann & Braun Contronic plug-in module associated with the 0776125 part-number family. Confirm the complete suffix, connector arrangement, rack position, and circuit assignment before replacement.
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Technical specifications for MB21

  • Manufacturer:
    ABB
  • Part Number:
    MB21
  • Product Family:
    ABB H&B Contronic
  • Product Type:
    H&B Contronic Plug-in Module
  • Stock:
    1
  • Module Format:
    Legacy plug-in control-system module
  • Channel / Circuit Assignment:
    Must be taken from the installed cabinet drawings
  • Connector / Keying:
    Match the installed rack position before use
  • Configuration Record:
    Record selector, jumper and wiring state before removal
  • Tariff Code:
    8538900000
  • 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 Cross-Reference Control Rack Integration Circuit Verification Application
  • Hartmann & Braun Contronic plug-in module
  • MB21 identification may include a 0776125-family reference
  • Replacement requires exact suffix, connector, rack-slot, and circuit-role matching

ABB MB21 is a Hartmann & Braun Contronic plug-in module designed for integration within a compatible industrial control cabinet.

Use the complete MB21 label and any visible 0776125-family reference to distinguish the required module configuration and suffix.

Before replacement, verify the connector keying, rack position, board population, adjacent modules, assigned circuit role, and applicable cabinet drawings.

Availability, condition, price, and shipping time for ABB MB21 are confirmed during quotation.

ABB MB21 H&B Contronic Plug-in Module Manuals, Product Family, Links

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.

  • 0776125A appears in secondary MB21 records
  • No suffix equivalence has been established by a qualifying OEM manual
  • The complete label on the installed module remains the controlling identity
  • Confirm the rear connector keying and rack-slot guides
  • Record the adjacent-module references and cabinet location
  • Compare the board population before fitting a replacement
  • Use the original cabinet drawing as the controlling reference for circuit assignments
  • Preserve all selector positions and wiring states
  • Function-test each affected circuit before returning it to service
  • Legacy H&B Contronic racks explicitly documented for MB21
  • Original Contronic control positions assigned to an MB21 module
  • Industrial process cabinets retaining the documented MB21 hardware architecture
Description
ABB MB21 is a Hartmann & Braun Contronic plug-in module designed for integration within a compatible Contronic control cabinet.

Use the complete MB21 identity together with any visible 0776125-family reference to verify the module’s circuit role, electrical function, channel arrangement, and operating requirements.

Before installation, match the complete label, suffix, connector keying, board population, and rack position. Record the wiring, settings, and operating state, then verify the connected circuit using the applicable cabinet drawings.

Alternative Names
MB21 MB 21 ABB MB21 ABB MB 21 H&B MB21 ABB H&B Contronic MB 21
Technical notes
MB21 requires matching of the complete label, connector arrangement, rack slot, and assigned circuit role before installation or testing.
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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.
Can MB21 be replaced using only the front model marking?
No. Match the complete MB21 marking, any rear or board-level number, connector keying, rack slot and the original cabinet drawings before accepting a replacement.
What evidence should a buyer request before accepting MB21?
Request clear photographs of the front, both board faces where accessible, rear connector, revision or suffix labels and the exact installed slot. The available records do not define every MB21 variant.
How should MB21 compatibility be checked when the exact manual is unavailable?
Compare the installed slot, connector keying, board population, visible controls and cabinet drawing reference. Do not infer pin compatibility from another Contronic model.
What must be recorded before disconnecting MB21?
Record terminal and cable identifiers, selector or jumper positions, live status indications, rack position and adjacent module references before isolation and removal.
Can MB21 be exchanged while the rack is energized?
No exact-model energized-exchange approval was found. Treat MB21 as non-hot-swappable unless the site's ABB/H&B documentation explicitly authorizes the procedure.
How should the 0776125A / 0776125-series reference be used for MB21?
Use it only as a secondary cross-reference lead. It is not a substitute for matching the actual MB21 label, connector and site documentation.
What is the main commissioning risk with MB21?
The largest risk is installing a physically similar card with a different signal assignment. Verify the complete part label, rack connector and site-defined circuit role, then test the affected loop under the approved site procedure.