S203MT-B20UC

Name: S203MT-B20UC
Brand: ABB
SKU: S203MT-B20UC

The ABB S203MT-B20UC is a high-performance miniature circuit breaker suitable for both DC and AC applications. It features a robust short circuit breaking capacity and flexible mounting options, ensuring reliable operation in various electrical systems.

Product ModelS203MT-B20UC

Material Number2CDS273065R0205

Product ID77685

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

1
1. High PerformanceThe ABB S203MT-B20UC is engineered to provide exceptional performance in both DC and AC applications, ensuring reliable operation under various conditions.
2
2. Robust Short Circuit Breaking CapacityEquipped with a high inbuilt short circuit breaking capacity, this circuit breaker protects your electrical system from potential damage caused by short circuits.
3
3. Flexible Mounting OptionsDesigned for easy installation, the S203MT-B20UC offers flexible mounting options, including DIN rail mounting, making it a versatile solution for different electrical setups.
4
4. Compliance with International StandardsThe ABB S203MT-B20UC meets all major international and local standards, including IEC/EN 60947-2, UL 1077, and CSA 22.2 No. 235, ensuring compliance and safety in your electrical system.

Technical Specifications

Detailed engineering parameters based on manufacturer documentation

Specifications may be subject to change without notice

Parameter

Value

Parameter

Value

Standards

IEC/EN 60947-2

Tripping Characteristic

Rated Operational Voltage

acc. to IEC 60898-1 440 V AC acc. to IEC 60898-1 440 V DC acc. to IEC 60898-1 440 V acc. to IEC 60947-2 440 V AC acc. to IEC 60947-2 440 V DC

Operational Voltage

Maximum (Incl. Tolerance) 462 V AC Maximum (Incl. Tolerance) 500 V DC 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. Reliability and DurabilityBuilt with high-quality materials and designed for long-term reliability, the S203MT-B20UC is a durable solution for your electrical needs, providing years of trouble-free operation.

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

AC/DC

Rated Current (In)

20 A

Rated Short-Circuit Capacity

(AC) 10 kA (230 V AC) 10 kA (253 V AC) 10 kA (400 V AC) 10 kA (440 V DC) 10 kA (230 V) 10 kA (400 V) 10 kA

Rated Ultimate Short-Circuit Breaking Capacity (Icu)

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

Rated Conditional Short-Circuit Current (Inc)

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

Rated Service Short-Circuit Breaking Capacity (Ics)

(440 V DC) 10 kA

Rated Frequency (f)

50 / 60 Hz DC

Power Loss

6.99 W at Rated Operating Conditions per Pole 2.33 W

Power Supply Connection

Please Note Polarity of Device

Contact Position Indication

ON / OFF

Energy Limiting Class

Electrical Endurance

1500 DC cycle 20000 AC cycle

Mechanical Endurance

20000 cycle

Number of Protected Poles

Number of Poles

Overvoltage Category

III

Tightening Torque

2.8 NÂ·m

Actuator Type

Toggle

Screw Terminal Type

Failsafe Bi-directional Cylinder-lift Terminal

Actuator Marking

I / O

Actuator Material

Insulation Group II, Black, Sealable

Housing Material

Insulation Group I, RAL 7035

Options Provided

Suitable for traction application

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

Remarks

Please note polarity of device

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 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 IPXXB 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

Interrupting Rating acc. to UL1077

(440 V DC) 10 kA

Width in Number of Modular Spacings

3.0

Product Net Width

52.5 mm

Product Net Height

88 mm

Product Net Depth / Length

69 mm

Product Net Weight

0.375 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)

4897 >> Miniature circuit breakers

Manufacturer ID

2CDS273065R0205