ABB S303P-Z50NA 50A Type Z miniature circuit breaker with 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£287.32
The ABB 2CDS383103R0578, also identified as the S303P-Z50NA, is a premium miniature circuit breaker (MCB) engineered to provide dependable protection against overloads and short circuits in industrial electrical installations. As part of the renowned ABB System pro M compact S300P series, it delivers outstanding reliability, high breaking performance and compliance with international IEC, UL and CSA standards for demanding industrial environments.
Featuring a Type Z tripping characteristic, this circuit breaker is specifically designed to protect sensitive electronic equipment, semiconductor devices, PLCs, instrumentation and control circuits. Its rapid magnetic trip response helps minimise fault energy and protects valuable equipment from damage while providing dependable thermal overload protection.
With a rated current of 50 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-Z50NA is ideal for industrial control panels, switchboards and OEM machinery. Its 25 kA breaking capacity, compact DIN rail mounting and robust construction make it suitable for demanding industrial applications.
The ABB S303P-Z50NA automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping protect wiring, industrial control equipment and connected electronic devices. Its industrial-grade construction provides dependable long-term performance in demanding environments.
Its Type Z tripping characteristic is intended for circuits containing sensitive electronic equipment that requires rapid fault clearance. This makes it an excellent choice for PLC systems, instrumentation, semiconductor devices, communication systems and precision automation equipment.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-Z50NA |
| Product ID | 2CDS383103R0578 |
| EAN | 4016779076791 |
| Product type | Miniature circuit breaker |
| Rated current | 50 A |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Neutral pole | Switched |
| Tripping characteristic | Type Z |
| Rated operational voltage | 415 V AC |
| Voltage type | AC/DC |
| Rated frequency | 50 / 60 Hz |
| Rated insulation voltage | 500 V |
| Impulse withstand voltage | 6 kV |
| Ultimate short-circuit breaking capacity | 25 kA at 415 V AC |
| Breaking capacity at 440 V AC | 15 kA |
| Electrical endurance | 10,000 operating cycles |
| Mechanical endurance | 20,000 operating cycles |
| Protection rating | IP20 (IP40 when installed in a suitable enclosure) |
| Mounting type | 35 mm DIN rail |
| Terminal capacity | 0.75 to 35 mm² solid, 0.75 to 25 mm² flexible |
| Operating temperature | -40 to +70 °C |
| Approximate dimensions (H × W × D) | 88 × 70 × 69 mm |
| Approximate weight | 0.496 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects sensitive three-phase electrical circuits against overloads and short circuits, particularly electronic control systems, PLCs and industrial automation equipment.
The ABB S303P-Z50NA has a rated current of 50 A.
Type Z breakers provide rapid magnetic tripping, making them ideal for protecting sensitive electronic devices, instrumentation and semiconductor equipment.
The breaker provides a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC.
The breaker mounts directly onto a standard 35 mm DIN rail inside industrial control panels and electrical distribution boards.
ABB System pro M compact S300P miniature circuit breakers are trusted worldwide for delivering dependable overload and short-circuit protection for industrial automation, machinery and electrical distribution systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...