The ABB S203-C20 (order code 2CDS253001R0204) is a three-pole miniature circuit breaker from the System pro M compact S200 range, rated 20 A with a C tripping characteristic. Like every S200, it is current-limiting and combines a delayed thermal release for overloads with an electromagnetic release that trips instantly at 5 to 10 x In for short circuits.
Reading the type code: S203 = S200 series, 3 protected poles; C = tripping curve; 20 = rated current in amperes. The breaker is 3 modules wide (52.5 mm) and snaps onto a 35 mm DIN rail.
Technical data
| ABB type | S203-C20 |
|---|---|
| ABB order code | 2CDS253001R0204 |
| Range | System pro M compact S200 |
| Poles | 3P |
| Tripping characteristic | C |
| Rated current (In) | 20 A |
| Rated operational voltage Un (IEC/EN 60898-1) | 400 V AC |
| Rated operational voltage Ue (IEC/EN 60947-2) | 440 V AC |
| Rated short-circuit capacity Icn (IEC/EN 60898-1) | 6 kA |
| Ultimate breaking capacity Icu (IEC/EN 60947-2) | 10 kA |
| Service breaking capacity Ics (IEC/EN 60947-2) | 7.5 kA |
| Instantaneous (magnetic) trip range | 5 to 10 x In |
| Thermal release | 1.13 x In no trip (> 1 h), 1.45 x In trip (< 1 h); reference 30 °C |
| Energy limiting class | 3 |
| Rated insulation voltage Ui | 250 V AC phase-earth, 500 V AC phase-phase |
| Rated impulse withstand voltage Uimp | 4 kV |
| Electrical endurance | 20,000 operations (AC) |
| Mechanical endurance | 20,000 operations |
| Terminals | Failsafe bi-directional cylinder-lift, 35 mm² solid/stranded, 25 mm² flexible, busbar 10 mm² |
| Tightening torque | 2.8 N·m (Pozidriv 2) |
| Dimensions per pole (H x D x W) | 88 x 69 x 17.5 mm |
| Width | 52.5 mm (3 modules) |
| Protection degree | IP20 (IP40 in enclosure with cover) |
| Ambient temperature | -25 to +55 °C |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077 |
| Condition | New, original ABB |
Typical applications
- Lighting and socket-outlet final circuits
- Resistive heating loads
- Distribution boards in commercial buildings
- Machine-building control cabinets
- Direct replacement of an ABB S203-C20 with the same order code
Compatibility and replacement
The order code 2CDS253001R0204 identifies exactly this pole count, curve and rating. Bottom-fitting auxiliary and signal contacts, shunt trips, undervoltage releases and motor operating devices from the System pro M compact range fit the S200 (accessories are sold separately). If your installation needs 10 kA breaking capacity, the S200 M version of the same rating has the same 88 x 69 mm pole size. When replacing, keep the curve (C) and rating (20 A) the circuit was designed for.
Frequently asked questions
Should I use the C curve or the D curve?
The C curve trips instantly at 5 to 10 x In; the D curve trips at 10 to 20 x In. Use C for general circuits; move to D only for loads with heavy inrush such as motors or transformers.
Does high ambient temperature affect it?
Yes. Per ABB, the thermal release is calibrated at 30 °C and the tripping current falls by about 6 % for every 10 K above that, so allow for it in hot panels.
How much space does it take in the panel?
3 modules, 52.5 mm wide, 88 mm high and 69 mm deep, on a 35 mm DIN rail. Terminals take up to 35 mm² solid or stranded cable, or a 10 mm² busbar.
Related parts
- ABB S203-C16 Miniature Circuit Breaker 3P 16A C-Curve
- ABB S203-C25 Miniature Circuit Breaker 3P 25A C-Curve
- ABB S204-C20 Miniature Circuit Breaker 4P 20A C-Curve
- All ABB Miniature Circuit Breakers
Used across industrial control panels, distribution boards and machine-building applications for reliable overcurrent and short-circuit protection.
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