ABB 2CDS383103R0518 S303P-Z25NA miniature circuit breaker with a 25 A rated current, 3P+N configuration, Type Z tripping characteristic and 25 kA breaking capacity.
£229.85
The ABB 2CDS383103R0518, also identified as the S303P-Z25NA, is a high-performance miniature circuit breaker (MCB) designed to protect sensitive industrial electrical circuits against overloads and short circuits. As part of the advanced ABB System pro M compact S300P series, it provides reliable circuit protection, a high breaking capacity and compatibility with international IEC, UL and CSA requirements.
This circuit breaker features a sensitive Type Z tripping characteristic, making it particularly suitable for electronic equipment, semiconductor devices, control circuits and other loads that require rapid protection against relatively low short-circuit currents. Its thermal release provides dependable overload protection, while the electromagnetic release quickly disconnects the circuit during a fault.
With a rated current of 25 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-Z25NA is suitable for three-phase industrial distribution and automation systems. Its 25 kA breaking capacity, compact DIN-rail format and integrated trip indication support safe and efficient installation in control panels, switchboards and specialist electrical equipment.
Miniature circuit breakers such as the ABB S303P-Z25NA automatically disconnect an electrical circuit when excessive current is caused by an overload or short circuit. This helps protect cables, control equipment and connected devices while reducing the risk of electrical damage, unplanned downtime and unsafe operating conditions.
The Type Z characteristic provides a sensitive magnetic response and is commonly selected for circuits containing electronic components, semiconductor devices and other equipment with limited tolerance to overcurrent. Its fast operation helps minimise fault energy before sensitive components can be damaged.
| Current | 25 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-Z25NA |
| Product ID | 2CDS383103R0518 |
| EAN | 4016779076852 |
| Product type | Miniature circuit breaker |
| Rated current | 25 A |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Neutral position | Right |
| Tripping characteristic | Type Z |
| Rated operational voltage | 415 V AC |
| Rated frequency | 50 / 60 Hz |
| Rated insulation voltage | 500 V AC |
| Ultimate breaking capacity | 25 kA at 400–415 V AC |
| Breaking capacity at 440 V AC | 15 kA |
| Dielectric test voltage | 2 kV for 1 minute |
| Protection rating | IP20; IP40 when installed in a suitable enclosure |
| Mounting type | 35 mm DIN rail |
| Terminal capacity | 0.75–35 mm², depending on conductor type |
| Tightening torque | 2.8 N·m |
| Electrical endurance | 20,000 operating cycles |
| Mechanical endurance | 20,000 operating cycles |
| Ambient operating temperature | -40 to +70 °C |
| Standards | IEC/EN 60947-2, IEC/EN 60898-1, UL 1077 and CSA 22.2 No. 235 |
| Approximate dimensions (H × W × D) | 88 × 70 × 69 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
This miniature circuit breaker protects sensitive three-phase electrical circuits against overloads and short circuits, including circuits containing electronic controls, semiconductor devices and industrial automation equipment.
The ABB S303P-Z25NA has a rated current of 25 A.
A Type Z characteristic provides sensitive and rapid magnetic tripping, making the breaker suitable for electronic equipment and other loads that require fast protection against relatively low fault currents.
The circuit breaker has a rated ultimate short-circuit breaking capacity of 25 kA at 400–415 V AC.
The breaker is mounted on a standard 35 mm DIN rail inside a suitable electrical distribution board, control panel or equipment enclosure.
ABB System pro M compact S300P miniature circuit breakers provide dependable overload and short-circuit protection for industrial control systems, sensitive equipment and electrical distribution installations requiring high breaking performance.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...