ABB MM21
ABB MM21
ABB MM21
ABB MM21
ABB MM21
ABB MM21
Ask our team:
  • Phone: +86 181 0690 9650
  • E-Mail sales1@apterpower.com
How We Verify Your Order
Before dispatch, we confirm the exact model, revision, condition, inspection requirements and shipping documents for your order.
See a real on-site verification case >>

MM21

/ 4.9
1001 reviews | Need a Specific Revision?
ABB MM21 is a Hartmann & Braun Contronic plug-in module. Replacement selection requires verification of the complete suffix, electrical function, connector arrangement, rack position, and assigned circuit role.
In Stock
Ships by Saturday, November 14
Fast Shipping Available
Get a quick price for MM21
Quantity
*E-mail
Company
*Mobile
*Content
Upload (gif, jpg, jpeg, png, bmp, doc, docx, xls, xlsx, ppt, pdf, csv)

Technical specifications for MM21

  • Manufacturer:
    ABB
  • Part Number:
    MM21
  • 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
  • Dimensions:
    4.1 × 18.6 × 12.9 cm
  • Weight:
    0.22 kg
  • 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 Mechanical Match Circuit Context Validation Plan Application
  • Legacy Hartmann & Braun Contronic plug-in module
  • Designed for an assigned position in a documented Contronic rack or control cabinet
  • Exact electrical function and suffix definition require confirmation from the installed system documentation

ABB MM21 is a legacy Hartmann & Braun Contronic plug-in module used within an established process-control hardware configuration.

Replacement suitability depends on the complete MM21 label, hardware revision, rack position, rear-connector keying, board population, and original cabinet drawings.

Before removing the installed module, record its configuration, indicator states, adjacent-module references, connector orientation, and every affected signal assignment.

Availability, condition, price, and shipping time for ABB MM21 are confirmed during quotation.

ABB MM21 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.

  • Confirm module width, depth, and front extraction hardware
  • Match the rear-connector keying to the installed slot
  • Compare the complete board population before using ABB MM21
  • Use the original cabinet drawing to confirm the function assigned to ABB MM21
  • Record all selector, jumper, and wiring states before removal
  • Do not transfer ratings from ABB MB21 or another visually similar card
  • Inspect connector condition before inserting ABB MM21
  • Test only the affected loop identified in the system documentation
  • Confirm stable operation before returning the cabinet to service
  • Legacy H&B Contronic racks whose drawings specify ABB MM21
  • Original Contronic process-control positions assigned to ABB MM21
  • Industrial control cabinets retaining the same documented ABB MM21 signal path
Description
ABB MM21 is a Hartmann & Braun Contronic plug-in module designed for integration within a compatible Contronic control cabinet.

Replacement selection requires verification of the module’s complete identity, electrical function, channel arrangement, operating requirements, connector configuration, and assigned circuit role.

Before replacement, compare the complete module marking, board population, connector keying, and rack slot. Record all wiring references, jumper or selector settings, and diagnostic indications before removing the module.

Alternative Names
MM21 MM 21 ABB MM21 ABB MM 21 H&B MM21 H&B Contronic MM21 ABB H&B Contronic MM 21
Technical notes
MM21 requires verification of the exact connector arrangement, rack slot, board population, and assigned signal role before installation or testing.
Exceptional Service

Our Mission

  • 100% Satisfaction

    We believe expertise is priceless. With over 20 years of experience, and top engineers on staff, we can help you solve or avoid problems that threaten your business.
  • Trust Guaranteed

    Not only do we have a vast inventory, our team makes sure every piece of equipment is in working condition. Your purchases are also backed by our Warranty.
  • Expertise

    Time is money, especially when your equipment is down. We work quickly to get your equipment on its way so you can get it back up and running.

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 MM21 be replaced using only the front model marking?
No. Match the complete MM21 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 MM21?
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 MM21 variant.
How should MM21 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 MM21?
Record terminal and cable identifiers, selector or jumper positions, live status indications, rack position and adjacent module references before isolation and removal.
Can MM21 be exchanged while the rack is energized?
No exact-model energized-exchange approval was found. Treat MM21 as non-hot-swappable unless the site's ABB/H&B documentation explicitly authorizes the procedure.
How should the MM21 / MM 21 reference be used for MM21?
Use it only as a secondary cross-reference lead. It is not a substitute for matching the actual MM21 label, connector and site documentation.
What is the main commissioning risk with MM21?
The largest risk is installing a physically similar card with a different signal assignment. Verify the rear connector, board population and cabinet-defined signal role, then test the affected loop under the approved site procedure.