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ABB S203-K20NA MCB – S200 – 3P+N – K – 20A
ABB S203-K20NA miniature circuit breaker with 20 A rated current, K trip characteristic and 3 protected poles plus neutral for industrial and commercial circuit protection.
£105.80
Why Choose the ABB S203-K20NA Miniature Circuit Breaker?
The ABB S203-K20NA is a high-quality 3-pole + neutral miniature circuit breaker (MCB) from the proven ABB System pro M compact S200 series. Designed for reliable overload and short circuit protection, it is well suited to industrial control panels, commercial distribution boards, OEM machinery and electrical systems requiring dependable supplementary protection.
Featuring a K trip characteristic, the S203-K20NA is designed for circuits with moderate inrush currents, making it suitable for motors, transformers, contactors, solenoids and other inductive loads. Its thermal magnetic operating principle provides delayed overload protection and instantaneous short circuit protection for robust electrical safety.
With a 20 A rated current, 3 protected poles plus neutral and a compact DIN rail mounted format, the ABB S203-K20NA offers efficient installation and compatibility with ABB System pro M compact accessories including auxiliary contacts, shunt trips and undervoltage releases.
Key Advantages
- Reliable 3-pole + neutral miniature circuit breaker.
- 20 A rated current for industrial and commercial protection.
- K trip characteristic suited to motors and inductive loads.
- Thermal and magnetic tripping mechanisms provide dependable protection.
- Current limiting construction helps reduce fault energy.
- DIN rail mounting for fast panel installation.
Key Features
- ABB System pro M compact S200 series.
- Model: S203-K20NA.
- Rated current: 20 A.
- Configuration: 3 protected poles + neutral.
- K tripping characteristic.
- Thermal overload and magnetic short circuit protection.
- Current limiting design.
- DIN rail mounting.
- Finger-safe screw terminals.
- Compatible with ABB System pro M compact accessories.
Reliable Circuit Protection for Industrial Applications
The ABB S203-K20NA uses thermal magnetic trip technology to protect circuits against overloads and short circuits. The delayed thermal trip responds to sustained overloads, while the electromechanical magnetic trip reacts rapidly to short circuit faults, helping safeguard equipment and reduce downtime.
As part of ABB's System pro M compact range, this miniature circuit breaker is designed for dependable performance in industrial and commercial environments. Its current limiting design helps reduce stress on downstream devices, making it a reliable choice for panel builders and electrical engineers.
Typical Applications
- Industrial control panels.
- Motor control circuits.
- Transformer and solenoid protection.
- OEM machinery.
- Commercial distribution boards.
- Automation and process control systems.
Technical Specifications
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| Breaking Capacity | 6 kA | |
|---|---|---|
| Phase | Three Phase | |
| Current | 20 A | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | K curve | |
| Manufacturer | ABB | |
| Series | System pro M compact S200 | |
| Model | S203-K20NA | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Rated current | 20 A | |
| Tripping characteristic | K | |
| Poles | 3 protected poles + neutral | |
| Rated operational voltage | Up to 480Y/277 V AC | |
| Rated frequency | 50 / 60 Hz | |
| Interrupting capacity | 6 kA at 480Y/277 V AC | |
| Protection | Thermal magnetic | |
| Mounting type | DIN rail | |
| Terminal type | Finger-safe screw terminals | |
| Feed type | Feed-through, suitable for reverse feed | |
| Protection rating | IP20 | |
| Standards | UL1077, CSA 22.2 No. 235, IEC/EN 60898-1, IEC/EN 60947-2 | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S203-K20NA used for?
The ABB S203-K20NA is used to provide overload and short circuit protection for industrial, commercial and OEM electrical circuits.
What does the K trip characteristic mean?
The K characteristic is suitable for circuits with moderate inrush currents, such as motors, transformers, solenoids and other inductive loads.
How many poles does this circuit breaker have?
The S203-K20NA features 3 protected poles plus a neutral pole, making it suitable for three-phase systems with neutral.
What is the current rating of the ABB S203-K20NA?
The ABB S203-K20NA has a 20 A rated current.
Can the S203-K20NA be mounted on a DIN rail?
Yes. The ABB S203-K20NA is designed for secure installation on standard DIN rails used in control panels and distribution boards.
Trusted by Electrical Professionals Worldwide
ABB System pro M compact miniature circuit breakers are trusted by panel builders, electrical contractors and OEM manufacturers for dependable circuit protection, quality construction and long service life.
