S203M-C8NA

Name: S203M-C8NA
Brand: ABB
SKU: S203M-C8NA

Product Description: The ABB S203M-C8NA is a 4-pole, 8A miniature circuit breaker with current limiting capabilities, ideal for residential, commercial, and industrial use. It includes delayed thermal tripping for overload protection and electromechanical tripping for short circuit protection, ensuring reliable and safe operation.

Product ModelS203M-C8NA

Material Number2CDS273103R0084

Product ID79811

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

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1. Comprehensive Protection MechanismsThe S203M-C8NA features two distinct tripping mechanisms: delayed thermal tripping for overload protection and electromechanical tripping for short circuit protection, providing comprehensive protection against electrical faults.
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2. High Breaking CapacityWith a breaking capacity of up to 10 kA at 230/400 V AC, the S203M-C8NA ensures reliable disconnection of high currents, making it suitable for a wide range of applications.
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3. Compact DesignDesigned to save space, the S203M-C8NA can be mounted on DIN rails, making it an ideal choice for installations where space is limited. The bottom-fitting auxiliary contact can be mounted to save an additional 50% of space.
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4. Wide Application CompatibilityThe S203M-C8NA complies with IEC/EN 60898-1 and IEC/EN 60947-2 standards, allowing its use in residential, commercial, and industrial settings. This ensures that the circuit breaker meets the necessary safety and performance requirements for various applications.

Technical Specifications

Detailed engineering parameters based on manufacturer documentation

Specifications may be subject to change without notice

Parameter

Value

Parameter

Value

Standards

IEC/EN 60898-1 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 60947-2 440 V AC

Operational Voltage

Maximum (Incl. Tolerance) 440 V AC Minimum 12 V AC Minimum 12 V DC

Rated Insulation Voltage (Ui)

acc. to IEC/EN 60664-1 440 V

Rated Impulse Withstand Voltage (Uimp)

5. Easy Installation and IndicationThe S203M-C8NA features a failsafe bi-directional cylinder-lift terminal and screw terminals, making installation straightforward. The red ON / green OFF contact position indication clearly shows the connected or disconnected status, enhancing user safety and convenience.

6. Environmental DurabilityDesigned to operate in a wide range of environmental conditions, the S203M-C8NA can withstand temperatures from -25°C to +55°C and has an IP20 enclosure with cover, ensuring it remains functional in various settings. Additionally, it meets the requirements for protection degree IP20 (finger safe) according to IEC/EN 60529.

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

Dielectric Test Voltage

50/60 Hz-1 min: 2 kV

Input Voltage Type

Rated Current (In)

8 A

Rated Short-Circuit Capacity

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

Rated Ultimate Short-Circuit Breaking Capacity (Icu)

(230 V AC) 25 kA (400 V AC) 15 kA (440 V AC) 15 kA (230 V) 25 kA (400 V) 15 kA

Rated Conditional Short-Circuit Current (Inc)

(230 V) 25 kA (400 V) 15 kA

Rated Service Short-Circuit Breaking Capacity (Ics)

(230 V AC) 7.5 kA

Frequency (f)

50 Hz

Rated Frequency (f)

50 / 60 Hz

Power Loss

6 W at Rated Operating Conditions per Pole 1.5 W

Power Supply Connection

Arbitrary

Contact Position Indication

Red ON / Green OFF

Energy Limiting Class

Electrical Endurance

20000 AC cycle

Mechanical Endurance

20000 cycle

Number of Protected Poles

Number of Poles

3+N

Overvoltage Category

III

Position of Neutral Terminals

Right

Tightening Torque

2.8 NÂ·m

Screw Terminal Type

Failsafe Bi-directional Cylinder-lift Terminal

Actuator Marking

I / O

Actuator Material

Insulation Group II, Black, Sealable

Housing Material

Insulation Group II, RAL 7035

Mounting on DIN Rail

TH35-15 (35 x 15 mm Mounting Rail) acc. to IEC 60715 TH35-7.5 (35 x 7.5 mm Mounting Rail) acc. to IEC 60715

Mounting Position

any

Recommended Screw Driver

Pozidriv 2

Accessories Available

Yes

Connecting Capacity

Busbar 10 / 10 mmÂ² Flexible with Ferrule 0.75 ... 25 mmÂ² Flexible 0.75 ... 25 mmÂ² Flexible 0.75 ... 25 mmÂ² Rigid 0.75 ... 35 mmÂ² Rigid 0.75 ... 35 mmÂ² Stranded 0.75 ... 35 mmÂ²

Installation Size

acc. to DIN 43880 1

Terminal Type

Screw Terminals

Ambient Air Temperature

Operation -25 ... +55 Â°C Storage -40 ... +70 Â°C

Reference Ambient Air Temperature

30 Â°C

Degree of Protection

IP20 IP40 Enclosure with Cover IP40

Pollution Degree

Environmental Conditions

28 cycles with 55 Â°C / 90-96 % and 25 Â°C / 95-100 %

Resistance to Vibrations

20 Cycles with Load 0.8 In: 5g 5 ... 150 ... 5 Hz

Resistance to Shock acc. to IEC 60068-2-27

25g 2 shocks 13 ms

Maximum Operating Voltage UL/CSA

125 V DC 480Y/277 V AC

Interrupting Rating acc. to UL1077

(125 V DC) 10 kA (277 V AC) 6 kA (480Y / 277 V AC) 6 kA

Connecting Capacity UL/CSA

Busbar 14-8 AWG Conductor 14-4 AWG

Tightening Torque UL/CSA

18 inÂ·lb

Width in Number of Modular Spacings

4.0

Product Net Width

70 mm

Product Net Height

88 mm

Product Net Depth / Length

69 mm

Product Net Weight

0.5 kg

Pole Net Weight

0.125 kg

Built-In Depth (t2)

69 mm

Dimension Diagram

2CDC022007F0010

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)

4897 >> Miniature circuit breakers

Object Classification Code

Manufacturer ID

2CDS273103R0084