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.
