S203-B63NA

Name: S203-B63NA
Brand: ABB
SKU: S203-B63NA

The ABB S203-B63NA is a 63A, 3+N miniature circuit breaker designed for reliable electrical protection. It features delayed thermal and electromechanical tripping mechanisms, ensuring comprehensive overload and short circuit protection. Compliant with IEC/EN 60898-1, IEC/EN 60947-2, and UL1077 standards, this MCB is suitable for residential, commercial, and industrial applications.

Product ModelS203-B63NA

Material Number2CDS253103R0635

Product ID80752

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

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1. Comprehensive ProtectionThe ABB S203-B63NA offers dual tripping mechanisms – delayed thermal for overload protection and electromechanical for short circuit protection, ensuring your electrical system is safeguarded against various hazards.
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2. Versatile ApplicationDesigned for residential, commercial, and industrial use, this miniature circuit breaker is a versatile solution for any electrical setup, meeting the stringent standards of IEC/EN 60898-1, IEC/EN 60947-2, and UL1077.
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3. Reliable PerformanceWith a breaking capacity of up to 6 kA at 230/400 V AC and rated currents up to 63A, the S203-B63NA provides robust performance under various operating conditions.
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4. Space-Efficient DesignThe bottom-fitting auxiliary contact allows for 50% space savings, making it an ideal choice for installations where space is limited.

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 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. Durable ConstructionBuilt to last, the S203-B63NA features a durable housing material (Insulation Group II, RAL 7035) and meets the electrical endurance of 10,000 AC cycles and mechanical endurance of 20,000 cycles, ensuring long-lasting reliability.

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)

63 A

Rated Short-Circuit Capacity

(AC) 6 kA (DC) 6 kA (400 V AC) 6 kA (400 V) 6 kA

Rated Ultimate Short-Circuit Breaking Capacity (Icu)

(230 V AC) 20 kA (400 V AC) 10 kA (440 V AC) 10 kA (230 V) 20 kA (400 V) 10 kA

Rated Conditional Short-Circuit Current (Inc)

(230 V) 20 kA (400 V) 10 kA

Rated Service Short-Circuit Breaking Capacity (Ics)

(230 V AC) 15 kA (400 V AC) 7.5 kA (440 V AC) 7.5 kA

Frequency (f)

50 Hz

Rated Frequency (f)

50 / 60 Hz

Power Loss

19.2 W at Rated Operating Conditions per Pole 4.8 W

Power Supply Connection

Arbitrary

Contact Position Indication

Red ON / Green OFF

Energy Limiting Class

Electrical Endurance

10000 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

Mounting Type

DIN-Rail

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 Rigid 0.75 ... 35 mmÂ² Rigid 0.75 ... 35 mmÂ² Stranded 0.75 ... 35 mmÂ²

Installation Size

acc. to DIN 43880 1

Wire Stripping Length

12.5 mm

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

110 V DC 480Y/277 V AC

Interrupting Rating acc. to UL1077

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

Connecting Capacity UL/CSA

Busbar 18-8 AWG Conductor 18-4 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

2CDS253103R0635