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ABB S203-Z50NA MCB – S200 – 3P+N – Z – 50A
ABB S203-Z50NA miniature circuit breaker with 50 A rated current, Z trip characteristic and 3 protected poles plus neutral for sensitive industrial and commercial circuit protection.
£140.52
Why Choose the ABB S203-Z50NA Miniature Circuit Breaker?
The ABB S203-Z50NA is a high-quality 3-pole + neutral miniature circuit breaker (MCB) from the proven ABB System pro M compact S200 series. Designed for overload and short circuit protection, it is suitable for industrial control panels, commercial distribution boards, automation systems and electrical installations requiring sensitive and reliable circuit protection.
Featuring a Z trip characteristic, the S203-Z50NA is designed for circuits with low inrush currents and applications where fast magnetic tripping is required. It is particularly suited to protecting PLCs, instrumentation, electronic control equipment, semiconductor circuits and other sensitive electrical loads.
With a 50 A rated current, 3 protected poles plus neutral and a compact DIN rail mounted format, the ABB S203-Z50NA offers straightforward installation, current limiting performance 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.
- 50 A rated current for industrial and commercial circuits.
- Z trip characteristic for sensitive electronic protection.
- 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-Z50NA.
- Rated current: 50 A.
- Configuration: 3 protected poles + neutral.
- Z tripping characteristic.
- Thermal overload and magnetic short circuit protection.
- Current limiting design.
- DIN rail mounting.
- Finger-safe terminals.
- Compatible with ABB System pro M compact accessories.
Reliable Protection for Sensitive Electrical Circuits
The ABB S203-Z50NA uses thermal magnetic trip technology to protect circuits against overloads and short circuits. The delayed thermal tripping mechanism responds to sustained overload conditions, while the electromechanical magnetic trip reacts rapidly to short circuit fault currents.
The Z curve makes this miniature circuit breaker especially useful where sensitive equipment requires rapid disconnection at relatively low fault currents. As part of ABB's System pro M compact range, it provides dependable current limiting performance, robust construction and long service life in demanding electrical installations.
Typical Applications
- PLC and automation systems.
- Electronic control equipment.
- Instrumentation and measurement circuits.
- Semiconductor protection.
- Industrial control panels.
- Commercial distribution boards.
Technical Specifications
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| Phase | Three Phase | |
|---|---|---|
| Current | 50 A | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | Z curve | |
| Breaking Capacity | 6 kA | |
| Manufacturer | ABB | |
| Series | System pro M compact S200 | |
| Model | S203-Z50NA | |
| Product ID | 2CDS253103R0578 | |
| EAN | 4016779552141 | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Rated current | 50 A | |
| Tripping characteristic | Z | |
| Poles | 3 protected poles + neutral | |
| Total number of poles | 4 | |
| Rated operational voltage | Up to 480Y/277 V AC | |
| Rated AC voltage | 400 V AC | |
| Rated DC voltage | 110 V DC | |
| Rated insulation voltage | 440 V | |
| Rated impulse withstand voltage | 4 kV | |
| Rated frequency | 50 / 60 Hz | |
| Breaking capacity | Up to 6 kA | |
| Current limiting class | 3 | |
| Protection | Thermal magnetic | |
| Mounting type | DIN rail | |
| Terminal type | Finger-safe terminals | |
| Protection rating | IP20 | |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm | |
| Weight | approx. 0.47 kg | |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077, CSA 22.2 No. 235 | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S203-Z50NA used for?
The ABB S203-Z50NA is used to provide overload and short circuit protection for sensitive electronic circuits, automation equipment, control panels and commercial electrical installations.
What does the Z trip characteristic mean?
The Z characteristic provides fast tripping at relatively low fault currents, making it suitable for sensitive electronics, PLCs, instrumentation and semiconductor circuits.
How many poles does this circuit breaker have?
The S203-Z50NA 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-Z50NA?
The ABB S203-Z50NA has a 50 A rated current.
Can the S203-Z50NA be mounted on a DIN rail?
Yes. The ABB S203-Z50NA 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 reliable circuit protection, current limiting performance and long service life.
