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2CDS383103R0157 ABB S303P-K0.5NA Miniature Circuit Breaker - 3+NP - K - 0.5 A

2CDS383103R0157 ABB S303P-K0.5NA Miniature Circuit Breaker – 3+NP – K – 0.5 A

ABB S303P-K0.5NA miniature circuit breaker with a 0.5 A rating, Type K tripping characteristic, 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.

SKU: 2CDS383103R0157Alt SKU: S303P-K0.5NAMPN: 2CDS383103R0157
This product has been discontinued A direct replacement is available below.
2CDS383103R0157 ABB S303P-K0.5NA Miniature Circuit Breaker - 3+NP - K - 0.5 A Replacement product ABB S303P-K0.5NA Miniature Circuit Breaker - 3+NP - K - 0.5 A SKU: 2CDS383103R0157 £249.05 ex VAT View

Manufacturer Lead Time

£249.05

Why Choose the ABB 2CDS383103R0157 S303P-K0.5NA Miniature Circuit Breaker?

The ABB 2CDS383103R0157, also known as the S303P-K0.5NA, is a premium miniature circuit breaker (MCB) designed to provide dependable protection against overloads and short circuits in industrial and commercial electrical systems. As part of the robust ABB S300P System pro M compact series, it delivers exceptional reliability, high fault-breaking performance and long service life for demanding power distribution applications.

Featuring a 3P+N configuration, the S303P-K0.5NA protects all three phase conductors while incorporating a switched neutral pole. Its Type K tripping characteristic is specifically designed for circuits with high inrush currents, making it ideal for motors, transformers, contactors and other inductive industrial loads.

With a rated current of 0.5 A, an operating voltage of up to 415 V AC and a high 25 kA breaking capacity, this miniature circuit breaker provides reliable protection for switchboards, control panels and industrial distribution systems. Its compact DIN rail mounting design enables fast installation and efficient use of panel space.

Key Advantages

  • Industrial-grade miniature circuit breaker for reliable electrical protection.
  • 0.5 A rated current with Type K tripping characteristic.
  • 3P+N configuration for three-phase systems with switched neutral.
  • 25 kA short-circuit breaking capacity.
  • Designed for circuits with high motor and transformer starting currents.
  • Compact DIN rail mounting for straightforward installation.

Key Features

  • ABB S300P System pro M compact series.
  • 0.5 A rated operational current.
  • Type K tripping characteristic.
  • Three protected poles plus switched neutral.
  • 25 kA rated breaking capacity.
  • Suitable for AC and DC applications within specified ratings.
  • Bidirectional supply capability.
  • DIN rail mounting for industrial control panels and distribution boards.

Reliable Circuit Protection for Industrial Applications

The ABB S303P-K0.5NA automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping protect electrical equipment, cables and connected systems while improving operational safety and minimising downtime.

Its Type K tripping characteristic makes it especially suitable for inductive loads that experience high starting currents. Combined with ABB's proven S300P platform, it offers dependable performance for industrial automation, machinery and commercial electrical installations.

Typical Applications

  • Motor protection circuits.
  • Industrial control panels.
  • Transformer protection.
  • Machine building and OEM equipment.
  • Industrial automation systems.
  • Commercial power distribution.

Technical Specifications

Current 0.5 A
Phase Three Phase
Manufacturer ABB
Series S300P System pro M compact
Model S303P-K0.5NA
Product ID 2CDS383103R0157
Product type Miniature circuit breaker
Rated current 0.5 A
Tripping characteristic Type K
Number of poles 3P+N
Number of protected poles 3
Rated operating voltage Up to 415 V AC
Voltage type AC/DC
Frequency 50 / 60 Hz
Breaking capacity 25 kA
Rated insulation voltage 500 V
Impulse withstand voltage 6 kV
Protection rating IP20 terminals / IP40 when installed in an enclosure
Mounting type DIN rail mounting
Module width 4 modules
Dimensions (H × W × D) approx. 88 × 70 × 69 mm
Weight approx. 0.496 kg
HS Code 85362010
Country of Manufacture Germany
Poles 3-pole + N
Device Type MCB
Trip Curve K curve
Breaking Capacity 25 kA

Frequently Asked Questions

What is the ABB 2CDS383103R0157 used for?

It protects three-phase electrical circuits against overloads and short circuits, particularly those supplying motors, transformers and other inductive loads.

What is the rated current of the S303P-K0.5NA?

The ABB S303P-K0.5NA has a rated operational current of 0.5 A.

Why does this breaker use a Type K tripping characteristic?

Type K breakers are designed to accommodate high inrush currents, making them suitable for motors, transformers and similar inductive equipment.

What is the short-circuit breaking capacity?

The S303P-K0.5NA provides a high 25 kA short-circuit breaking capacity for demanding industrial installations.

How is the ABB S303P-K0.5NA installed?

It is designed for mounting on a standard DIN rail inside electrical distribution boards, switchboards and industrial control panels.

Trusted by Electrical Professionals Worldwide

ABB S300P miniature circuit breakers are trusted by industrial engineers, OEM machine builders and panel manufacturers to deliver reliable overload and short-circuit protection in demanding electrical installations.

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