How to Select an RCD: Sensitivity, Type and Poles Checklist
A step-by-step checklist for selecting RCD sensitivity, type, poles and rated current, matched to the earthing system, IEC standards, and special cases like EV...
- Part number
- 2CSB203001R1250
- Model no
- DDA203
Residual Current Devices RCD BlocksABB 2CSB203001R1250 DDA203 AC-25/0.03 3P 25A 30mA Type AC RCD Block Residual Current Device Module
ABB DDA203 AC-25/0.03 3-pole RCD block, 25A, 30mA Type AC, instantaneous, for S200/S300P MCBs.
Description
About the DDA203
About the DDA203
The ABB 2CSB203001R1250 (DDA203 AC-25/0.03) is a 3-pole, 25 A residual current device block with 30 mA Type AC sensitivity and instantaneous tripping, designed to add earth-fault protection to S200-series and S300P miniature circuit breakers. It is rated 230/400 V with a 1 kA short-circuit current rating and mounts on 5 DIN-rail module spacings.
Certifications & Standards
- IEC/EN 61009 Ann. G
Selection Notes
The AC-25/0.03 suffix on the DDA203 encodes 25 A rated current and 30 mA sensitivity, the stricter setting used for direct-contact protection on 3-phase circuits. As a 3-pole block it protects all three phases of a 3-phase MCB rather than the single-phase coverage of a 2-pole RCD block. Choose the 300 mA sensitivity version instead where only indirect-contact protection is needed.
Specification
Full specification
Technical 12
| Type of Residual Current | Type AC |
|---|---|
| Test Voltage (Ut) | 195...440 V |
| Rated Current Sensitivity | 30 mA |
| Leakage Current Type | AC |
| Power Supply Connection | Arbitrary |
| Electrical Endurance | 10000 cycle |
| Number of Poles | 3P |
| Number of Modular Spacings per DIN Rail | 5 |
| Operating Characteristic | Instantaneous |
| Tightening Torque | 1.2 N·m |
| Cable Cross-Section | Flexible Cable 0...16 mm², Rigid Cable 0...16 mm² |
| Connecting Capacity | Flexible 0...16 mm², Rigid Cable 0...16 mm² |
Electrical 9
| Short-Circuit Current Rating (SCCR) UL/CSA | 1 kA |
|---|---|
| Rated Voltage (Ur) | 230/400 V |
| Rated Operational Voltage | 230/400 V |
| Rated Insulation Voltage (Ui) | acc. to IEC/EN 60664-1 500 V |
| Rated Impulse Withstand Voltage (Uimp) | 4 kV |
| Rated Current (In) | 25 A |
| Rated Residual Current | 30 mA |
| Rated Frequency (f) | 50 / 60 Hz |
| Power Loss | Total 3 W |
Design 1
| Number of Modules | 5 |
|---|
Show all 58 specifications ↓ Show less ↑36 more values in Identification, Material Compliance, Environmental, Dimensions, External Classifications and Standards, Logistics.
Identification 11
| Part number | 2CSB203001R1250 |
|---|---|
| Type designation | DDA203 |
| Brand | ABB |
| Condition | New, factory sealed |
| Source | ABB and its authorised distributors |
| Warranty | Manufacturer warranty |
| EAN | 8012542792505 |
| ETIM class | EC002297 |
| eCl@ss | 27142210 |
| Package Level 1 Units | box 1 piece |
| Package Level 1 Gross Weight | 212 g |
Material Compliance 6
| RoHS Information | Following EU Directive 2011/65/EU and Amendment 2015/863 July 22, 2019 |
|---|---|
| RoHS Date | 20070731 |
| REACH Information | True - contains substances > 0.1 mass percentage |
| REACH Date | 20251223 |
| WEEE Category | 5. Small Equipment (No External Dimension More Than 50 cm) |
| WEEE B2C / B2B | Business To Consumer |
Environmental 7
| Ambient Temperature | -25...55 °C |
|---|---|
| Ambient Air Temperature | Operation -25...50 °C |
| Degree of Protection | IP2X |
| Pollution Degree | 2 |
| Resistance to Vibrations | 20 Cycles with Load 0.8 In: 1g or 0.1mm 5...150...5 Hz |
| Resistance to Shock acc. to IEC 60068-2-27 | 25g 2 shocks 13 ms |
| Environmental Information | Refer to RoHS |
Dimensions 4
| Product Net Width | 87.5 mm |
|---|---|
| Product Net Height | 93 mm |
| Product Net Depth / Length | 69 mm |
| Product Net Weight | 325 g |
External Classifications and Standards 4
| ETIM 10 | EC002297 - Residual current circuit breaker (RCCB) module |
|---|---|
| UNSPSC | 39121601 |
| eClass | V11.0 : 27142210 |
| Standards | IEC/EN 61009 Ann. G |
Logistics 4
| Shipping weight | 0.325 kg |
|---|---|
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 02 Oct 2026
Documents
Documents for 2CSB203001R1250
No documents are on file for this part yet.
Ask us for the datasheet
Certifications
Certifications and standards
- IEC/EN 61009 Ann. G
Quick answers
Questions about the DDA203
What is the rated current of DDA203?
The rated current of DDA203 is 25 A.
Which supply voltage is DDA203 rated for?
The rated operational voltage of DDA203 is 230–400 V AC.
What is the HS code of DDA203 for customs?
The tariff (HS) code on file for DDA203 is 853630.
What is the EAN of DDA203?
The EAN (GTIN) of DDA203 is 8012542792505.
Where does DDA203 ship from, and how fast?
DDA203 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
Guides for RCD
RCD Selectivity: S-Type vs Instantaneous Discrimination
How S-type selective RCDs coordinate with downstream instantaneous devices using the 2x current ratio and time-delay rule from IEC 60947-2 and IEC 61008-1.
Type A vs Type B RCD: Which for VFD, EV and Solar
Type A RCDs resolve AC and pulsating DC, while Type B is required wherever a fault can produce smooth DC, covering three-phase VFDs, most...
Reviews
Customer reviews
Series
ABB Residual Current Devices RCD Blocks
- Brand
- ABB
- Series
- Residual Current Devices RCD Blocks
