S203MR-K50

Name: S203MR-K50
Brand: ABB
SKU: S203MR-K50

The ABB S203MR-K50 is a 3-phase miniature circuit breaker with a 50A rated current. It offers high performance and reliability, meeting UL 489, CSA 22.2 No. 5, and IEC/EN 60947-2 standards. Ideal for various electrical applications.

Product ModelS203MR-K50

Material Number2CDS273437R0577

Product ID79655

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

1
1. High Performance and ReliabilityThe ABB S203MR-K50 is engineered to provide consistent and reliable electrical protection, ensuring the safety of your equipment and personnel.
2
2. Compliance with International StandardsMeets UL 489, CSA 22.2 No. 5, and IEC/EN 60947-2 standards, making it a trusted choice for global applications.
3
3. Versatile ApplicationSuitable for a wide range of electrical applications, including industrial and commercial settings, due to its 3-phase design and 50A rated current.
4
4. Efficient Electrical ProtectionWith a breaking capacity of 10 kA, the S203MR-K50 effectively handles short-circuit currents, minimizing damage to your electrical system.
5

Technical Specifications

Detailed engineering parameters based on manufacturer documentation

Specifications may be subject to change without notice

Parameter

Value

Parameter

Value

Standards

CSA 22.2 No. 235 IEC/EN 60947-2 UL 1077

Tripping Characteristic

Rated Operational Voltage

acc. to IEC 60898-1 400 V AC acc. to IEC 60898-1 400 V acc. to IEC 60947-2 400 V AC

Rated Insulation Voltage (Ui)

acc. to IEC/EN 60664-1 440 V

Rated Impulse Withstand Voltage (Uimp)

4 kV at 2000 m 5 kV at Sea Level 6.2 kV

Input Voltage Type

5. Durable ConstructionBuilt with high-quality materials and designed for long-lasting performance, ensuring that your electrical system remains protected over time.

Rated Current (In)

50 A

Rated Short-Circuit Capacity

(230 V AC) 10 kA (400 V AC) 10 kA

Rated Ultimate Short-Circuit Breaking Capacity (Icu)

(230 V AC) 10 kA (400 V AC) 15 kA (400 V) 6 kA

Rated Conditional Short-Circuit Current (Inc)

(230 V) 10 kA (400 V) 10 kA

Rated Service Short-Circuit Breaking Capacity (Ics)

(400 V AC) 7.5 kA

Rated Frequency (f)

50 / 60 Hz

Power Loss

5.4 W at Rated Operating Conditions per Pole 1.8 W

Energy Limiting Class

Number of Protected Poles

Number of Poles

Overvoltage Category

III

Accessories Available

Yes

Connecting Capacity

Flexible with Ferrule 0.75 ... 25 mmÂ² Flexible 0.75 ... 25 mmÂ² Flexible 0.75 ... 25 mmÂ² Rigid 0.75 ... 35 mmÂ² Stranded 0.75 ... 35 mmÂ²

Terminal Type

Double Clamp

Ambient Air Temperature

Operation -25 ... +55 Â°C

Degree of Protection

IP20

Pollution Degree

Interrupting Rating acc. to UL1077

(480Y / 277 V AC) 10 kA

Width in Number of Modular Spacings

3.0

Product Net Width

52.5 mm

Product Net Height

100 mm

Product Net Depth / Length

71 mm

Product Net Weight

0.42 kg

Built-In Depth (t2)

69 mm

ETIM 8

EC000042 - Miniature circuit breaker (MCB)

ETIM 9

EC000042 - Miniature circuit breaker (MCB)

WEEE Category

5. Small Equipment (No External Dimension More Than 50 cm)

WEEE B2C / B2B

Business To Business

CN8

8536 20 10

UNSPSC

39121603

eClass

V11.0 : 27141901

IDEA Granular Category Code (IGCC)

4899 >> Miniature circuit breaker (MCB) screw-in model

Manufacturer ID

2CDS273437R0577