ABB S301P-K0.3NA 1P+N miniature circuit breaker with a 0.3 A rated current, Type K tripping characteristic and 25 kA short-circuit breaking capacity.
£114.09
The ABB 2CDS381103R0117, designated S301P-K0.3NA, is a specialist 1P+N miniature circuit breaker (MCB) from the ABB System pro M compact S300P range. Designed for demanding industrial control applications, it provides dependable overload and short-circuit protection for very low-current circuits whilst simultaneously switching the neutral conductor to improve electrical isolation.
The S301P-K0.3NA combines thermal overload protection with a high magnetic instantaneous trip threshold, making it particularly suitable for inductive loads that generate high inrush currents during energisation. Its integrated trip indicator, contact position indication, fail-safe terminals and dual DIN rail release provide straightforward installation, maintenance and fault identification.
With a 0.3 A rated current, a Type K tripping characteristic and a 25 kA rated short-circuit breaking capacity, this miniature circuit breaker is ideal for protecting transformers, relays, solenoids, instrumentation and other precision industrial control circuits.
The ABB S301P-K0.3NA is engineered for specialist industrial circuits where conventional miniature circuit breakers may trip unnecessarily during energisation. Its K characteristic allows significantly higher instantaneous current before magnetic tripping whilst maintaining reliable overload protection throughout normal operation.
This makes it particularly suitable for transformer secondary circuits, relay control systems, solenoid-operated equipment, instrumentation and precision automation installations requiring both extremely low current ratings and high short-circuit performance.
| Current | 0.3 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Extended Product Type | S301P-K0.3NA |
| Manufacturer Part Number | 2CDS381103R0117 |
| Product Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1P+N |
| Protected Poles | 1 |
| Rated Current | 0.3 A |
| Tripping Characteristic | Type K |
| Magnetic Tripping Range | 8–12 × In |
| Rated Operational Voltage | 240 V AC / 72 V DC |
| Rated Frequency | 50 / 60 Hz and DC |
| Rated Short-Circuit Breaking Capacity (Icn) | 25 kA |
| Rated Service Breaking Capacity (Ics) | 12.5 kA |
| Rated Insulation Voltage (Ui) | 500 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Minimum Operating Voltage | 12 V AC/DC |
| Overvoltage Category | IV |
| Pollution Degree | 3 |
| Protection Rating | IP20 (IP40 when installed within a suitable enclosure) |
| Terminal Capacity | 0.75–35 mm² rigid, 0.75–25 mm² flexible |
| Mechanical Endurance | 20,000 operations |
| Operating Temperature | -40°C to +70°C |
| Mounting | 35 mm DIN rail |
| Dimensions (H × W × D) | Approx. 88 × 35 × 69 mm |
| Weight | Approx. 0.248 kg |
| EAN | 4016779079723 |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077 and CSA 22.2 No. 235 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects specialist low-current industrial circuits supplying inductive equipment such as transformers, relays, solenoids and automation control systems.
The ABB S301P-K0.3NA has a 0.3 A rated current.
A Type K MCB trips magnetically at approximately eight to twelve times its rated current, making it ideal for inductive loads with high starting currents.
The circuit breaker has a 25 kA rated short-circuit breaking capacity and a 12.5 kA rated service breaking capacity.
A 1P+N device protects the live conductor whilst simultaneously switching the neutral conductor, providing improved circuit isolation during servicing and maintenance.
ABB System pro M compact miniature circuit breakers are trusted worldwide by industrial panel builders, machine manufacturers and electrical engineers for their exceptional reliability, high breaking capacity and compliance with international standards.
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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...