What is an MRCD? The principle of modular residual current protection
Explore the protection chain comprising a compatible measuring current transformer, MRCD module and circuit breaker.
Read the technical guideProduct families / Residual current monitoring / LINETRAXX® MRCDB300 series
Official Bender product image
BENDER DISTRIBUTOR IN TÜRKİYE · ADEO TEKNİK
Bender LINETRAXX® MRCDB300 seriesType B MRCD Series
Modular series forming an AC/DC residual current protection combination with a CTBC measuring current transformer and suitable circuit breaker.
TECHNICAL SUMMARY
Features of this model.
Modular residual current protection · MRCD
- DC 24 V supply; value reading and parameter setting via Modbus RTU.
- K1/K2 changeover contacts and contact feedback for monitoring circuit-breaker status.
- MRCDB301: 30 mA Type B; MRCDB302: 300 mA Type B+ variant.
- MRCDB303/304 for configurable installation protection; MRCDB305 for applications with high peak load currents.
FROM PRODUCT TO TECHNICAL KNOWLEDGE
All technical guides ↗Related technical guides
Explore the product's function and its system's operating principle through technical explanations.
How do you choose Type A or Type B residual current monitoring?
Review AC, pulsating DC and smooth DC detection coverage together with sensor and model selection.
Read the technical guideRCM versus RCD: How does residual current monitoring work?
Learn the difference between residual current measurement/alarm and tripping for protection.
Read the technical guideADEO Teknik · Bender distributor in Türkiye
Ask ADEO Teknik Technical product information and supply support for model selection, compatible components and current manufacturer documentation.
MODEL, ORDER AND ACCESSORY INFORMATION
Compare all options in the series.
Assess the option for your application using model names, order codes and technical values. Accessories appear in separate tables.
20 / 20 options
No options match your search. Change the model name or order code.
Model options and technical values
| Model | Supply voltage U S | Variant | Order code |
|---|---|---|---|
| MRCDB301 | DC 24 V (19.2…28,8 V) | Protection of persons | B74043120 |
| MRCDB302 | DC 24 V (19.2…28,8 V) | Fire protection | B74043121 |
| MRCDB303 | DC 24 V (19.2…28,8 V) | Protection of persons, fire protection and plant protection (freely configurable) | B74043122 |
| MRCDB305 | DC 24 V (19,2…28,8 V) | Protection of persons for applications with pulsed, / very high peak load currents (> 1 kA for < 1 s), e.g. welding applications | B74043125 |
Manufacturer table notes (original language):
Required terminals are included in the scope of delivery.
Measuring current transformers
Model options and technical values
| Model | Internal diameter | Order code |
|---|---|---|
| CTBC20 | 20 mm | B98120001 |
| CTBC20P | 20 mm | B98120002 |
| CTBC35 | 35 mm | B98120003 |
| CTBC35P | 35 mm | B98120004 |
| CTBC60 | 60 mm | B98120005 |
| CTBC60P | 60 mm | B98120006 |
| CTBC120 | 120 mm | B98120007 |
| CTBC120P | 120 mm | B98120020 |
| CTBC210 | 210 mm | B98120008 |
| CTBC210P | 210 mm | B98120021 |
Manufacturer table notes (original language):
P = full magnetic shield
Explore compatible accessories
Compatible accessories · 1
| Description | Order code |
|---|---|
| Interface converter USB to RS-485 | B95012045 |
| Terminal block for MRCD module* | B74043124 |
| Snap-on mounting for CTBC20 and CTBC20P* | B91080111 |
| Snap-on mounting for CTBC35 and CTBC35P* | B91080112 |
Manufacturer table notes (original language):
* Included in scope of delivery
Voltage supply
Compatible accessories · 2
| Model | Maximum number of connectable current transformers | Order code |
|---|---|---|
| STEP-PS/1 AC/24 DC/1.75 | 14 | B94053111 |
| STEP-PS/1 AC/24 DC/4.2 | 34 | B94053112 |
Based on tables on the manufacturer's current product page. For marked-value footnotes, connection conditions and variant suitability, review Bender product source ↗ and the technical documents together. Listing an order code does not commit to stock availability or delivery time.
BENDER MANUFACTURER DOCUMENTS
Access technical documentation in one place.
Find product and accessory documents by type or file name. Language and file information appear beside each document.
11 / 11 documents
Datasheet
MRCDB300 series
MRCDB300-series_D00343_D_XXEN.pdfTechnical summary source · pp. 1, 2, 3Open document ↗Operating manualCTBC series
CTBC_D00336_M_XXEN.pdfOpen document ↗Operating manualMRCDB300 series
MRCDB300-series_D00343_M_XXEN.pdfOpen document ↗Quick startMRCDB300 series
MRCDB300-series_D00343_Q_XXEN.pdfOpen document ↗Conformity documentCTxx
CEKO_CTxx.pdfOpen document ↗Conformity documentMRCDB30x
CEKO_MRCDB30x.pdfOpen document ↗Conformity documentUKCA - CTxx
UKCA_CTxx.pdfOpen document ↗Conformity documentUKCA - MRCDB30x
UKCA_MRCDB30x.pdfOpen document ↗Conformity documentUKCA - MRCDB3xx
UKCA_MRCDB3xx.pdfOpen document ↗BrochureModular Residual Current Devices (MRCD)
MRCD_Fly_en.pdfOpen document ↗Other technical documentsTÜV NORD - AGH150x, CTACx, CTBCx, EDS44x, CTUB10x, MRCDB30x and RCMB30x
Z_1436.GR.20210803.144728_en.pdfOpen document ↗No documents match your search. Change the search or document type.
About manufacturer sources
This summary is based on the product descriptions, features and variant information on the specified document pages. Consult the manufacturer document for complete technical values, connection information and ordering options.
Current product and variant information · Bender ↗
Data sheets, operating manuals and related manufacturer documents. File names identify the model or accessory; documents retain their original language.
ADEO Teknik · Bender's distributor in Türkiye. Current Bender product source ↗
APPLICATIONS
Its role in your application.
Selected according to different protection objectives in industrial TN and TT systems. The combination of measurement electronics and CTBC core allows transformer diameter and function to be matched to the application.
RELATED MODELS
