ABB 2CDS381103R0577 S301P-K50NA miniature circuit breaker with a 50 A rating, Type K tripping characteristic, 1P+N configuration, 240 V AC operating voltage and 25 kA ultimate breaking capacity.
£122.20
The ABB 2CDS381103R0577, also designated S301P-K50NA, is a high-performance miniature circuit breaker (MCB) from the ABB System pro M Compact S300P series. Designed for industrial and infrastructure applications, it protects electrical circuits against overloads and short circuits while providing the high interruption capability required in demanding installations.
This ABB S300P circuit breaker features fail-safe bi-directional terminals, integrated contact and trip-position indication, and a dual-release DIN rail mounting system. Supply can be connected from the top or bottom, helping panel builders and electrical contractors achieve flexible, secure and efficient installation.
With a 50 A rated current, a Type K tripping characteristic, a 1P+N pole configuration and a 25 kA ultimate short-circuit breaking capacity, the ABB 2CDS381103R0577 is particularly suitable for motors, transformers, contactors, solenoids and other inductive loads that produce high starting currents.
Type K miniature circuit breakers are engineered for circuits containing inductive equipment that draws a substantial current when energised. The ABB S301P-K50NA has an electromagnetic tripping range of approximately ten to fourteen times its rated current, allowing normal motor or transformer start-up currents to pass without unnecessary interruption.
If a sustained overload or genuine short circuit occurs, the breaker disconnects the affected circuit to protect cables, equipment and the wider installation. This balance between inrush-current tolerance and rapid fault response makes the ABB 2CDS381103R0577 well suited to industrial machinery, automation systems and other applications where conventional protection may experience nuisance tripping.
| Current | 50 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Product range | System pro M Compact |
| Series | S300P |
| Product ID / MPN | 2CDS381103R0577 |
| Extended product type | S301P-K50NA |
| Product type | Miniature circuit breaker |
| GTIN / EAN | 4016779135665 |
| Rated current | 50 A |
| Tripping characteristic | Type K |
| Magnetic tripping range | 10–14 × In AC |
| Pole configuration | 1P+N |
| Number of protected poles | 1 |
| Rated operating voltage | 240 V AC / 72 V DC |
| Maximum power-frequency recovery voltage | 264 V AC / 72 V DC |
| Minimum operating voltage | 12 V AC / 12 V DC |
| Rated frequency | 50/60 Hz and DC |
| Rated insulation voltage | 500 V AC |
| Rated impulse withstand voltage | 6 kV |
| Ultimate short-circuit breaking capacity (Icu) | 25 kA |
| Service short-circuit breaking capacity (Ics) | 7.5 kA |
| UL 1077 interrupting capacity | 10 kA |
| Reference temperature for Type K characteristic | 40°C |
| Ambient operating temperature | -40°C to +70°C |
| Mechanical endurance | 20,000 operations |
| Electrical endurance | 10,000 operations AC; 1,500 operations DC |
| Terminal protection rating | IP20 |
| Enclosure protection rating | Up to IP40 when installed in an enclosure with cover |
| Maximum solid or stranded conductor size | 35 mm² |
| Maximum flexible conductor size | 25 mm² |
| Terminal tightening torque | 2.8 Nm |
| Mounting method | 35 mm DIN rail to EN 60715 |
| Mounting position | Any |
| Approximate dimensions (H × W × D) | 88 × 35 × 69 mm |
| Approximate weight | 0.248 kg |
| Standards | IEC/EN 60947-2, IEC/EN 60898-1, UL 1077 and CSA 22.2 No. 235 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB 2CDS381103R0577 protects industrial electrical circuits against overloads and short circuits. Its Type K characteristic makes it particularly suitable for motors, transformers and other inductive equipment with high starting currents.
The ABB S301P-K50NA has a rated current of 50 A.
The Type K characteristic allows relatively high temporary inrush currents while maintaining effective overload and short-circuit protection. Its electromagnetic release operates at approximately 10–14 times the rated current under AC conditions.
The breaker protects the phase conductor against overcurrent and simultaneously switches the neutral conductor. This provides two-conductor disconnection with one protected pole.
The ABB 2CDS381103R0577 has an ultimate short-circuit breaking capacity of 25 kA in accordance with IEC/EN 60947-2.
Yes. The ABB S300P design permits supply from either the top or bottom, providing greater flexibility when wiring control panels and distribution boards.
Yes. It is designed for mounting on a standard 35 mm DIN rail in accordance with EN 60715 and features a dual-release mechanism for easier installation and removal.
ABB System pro M Compact S300P miniature circuit breakers are specified by electrical engineers, panel builders, machine manufacturers and OEMs for their high interruption capability, flexible installation features and dependable protection in demanding commercial and industrial applications.
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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...