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Siemens 5SY4203-8 Miniature Circuit Breaker 2-Pole 3A, 400V, 10kA, Type
Siemens 5SY4203-8 Miniature Circuit Breaker 2-Pole 3A, 400V, 10kA, Type
Siemens 5SY4203-8 Miniature Circuit Breaker 2-Pole 3A, 400V, 10kA, Type
Siemens 5SY4203-8 Miniature Circuit Breaker 2-Pole 3A, 400V, 10kA, Type

SIEMENS

Siemens 5SY4203-8 Miniature Circuit Breaker 2-Pole 3A, 400V, 10kA, Type D Original Brand New

Model / SKU5SY4203-8

High-performance miniature circuit breaker designed for industrial and commercial protection. Featuring a 3A current rating, 2-pole configuration, and Type D tripping characteristic, it provides reliable short-circuit and overload protection with a 10kA breaking capacity.

Original price was: $99.05.Current price is: $51.49.
In stockShips in 1–3 business days
  • ConditionOriginal Brand New
  • Warranty12 months
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Description

Overview

The Siemens 5SY4203-8 Miniature Circuit Breaker is a high-performance electrical protection device designed for residential, commercial, and industrial applications. Rated at 400 V with a breaking capacity of 10kA, this 2-pole Type D breaker ensures maximum protection for sensitive and inductive loads. Compact yet robust, with a 70 mm D-width, it is perfect for installation in standard distribution boards.

Engineered by Siemens, this miniature circuit breaker guarantees reliable overcurrent and short-circuit protection, providing safety and efficiency in your electrical system.

Features

  • Rated voltage: 400 V

  • Breaking capacity: 10 kA

  • Poles: 2-pole (D)

  • Rated current: 3 A

  • Width: 70 mm (D-type)

  • Compact and durable design

  • Easy to install in standard DIN rail systems

Benefit

  • Protects electrical circuits from overload and short circuits

  • Enhances safety for residential and industrial installations

  • Compact size saves space in distribution panels

  • Reliable Siemens quality ensures long-term durability

  • Quick and easy installation

Function

  • Tripping Characteristic D: Ideal for circuits with high inductive loads and peak starting currents (e.g., transformers, motors, and solenoid valves).

  • 2-Pole Design: Simultaneous disconnection of two phases for enhanced safety.

  • Thermal-Magnetic Trip: Provides dual protection against both sustained overloads and instantaneous short circuits.

  • Voltage Rating: Optimized for 400 V AC systems.

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Datasheet in PDF

Specifications

SKU / Model5SY4203-8
BrandSIEMENS
product brand nameSENTRON
product designationMiniature circuit breaker
number of poles2
design of pole2P
tripping characteristic classD
mechanical service life (switching cycles) / typical10 000
overvoltage categoryIII
degree of pollution3
type of voltage / of the operating voltageAC
insulation voltage (Ui)-
● with single-phase operation / at AC / rated value440 V
● with multi-phase operation / at AC / rated value440 V
supply voltage / with single-phase operation / at AC / rated value230 V
supply voltage-
operating voltage / at DC / rated value / maximum72 V
protection class IPIP20, with connected conductors
switching capacity current-
● at DC / acc. to IEC 60947-2 / rated value15 kA
● acc. to EN 60898 / rated value10 kA
● acc. to IEC 60947-2 / rated value35 kA
power loss [W] / for rated value of the current / at AC / in hot operating state / per pole1.2 W
operational current-
● at 35 °C / rated value3 A
● at 40 °C / rated value2.82 A
● at 45 °C / rated value2.72 A
● at 50 °C / rated value2.62 A
● at 55 °C / rated value2.52 A
● at 60 °C / rated value2.41 A
● at AC / rated value3 A
suitability for operationMechanical engineering / industry
product component / neutral conductor switchingNo
product feature / touch protectionYes
product component-
● combined terminal topYes
● combined terminal bottomYes
product feature-
● properties for main switches in accordance with EN 60204-1Yes
● halogen-freeYes
● sealableYes
● silicon-freeYes
product extension / installable / supplementary devicesYes
breaking capacity short-circuit current (Icn)-
● at AC / acc. to UL 1077 and CSA C22.2 No.2355 kA
connectable conductor cross-section / solid-
connectable conductor cross-section / stranded-
connectable conductor cross-section / finely stranded / with core end processing-
AWG number / as coded connectable conductor cross section-
tightening torque [lbf·in] / with screw-type terminals-
tightening torque / with screw-type terminals-
position / of power supply cordAny
installation depth70 mm
number of modular width units2
fastening methodQuick assembly system
mounting positionany
influence of the surrounding temperaturemax. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C
vibration resistance / acc. to IEC 60068-2-6±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz
ambient temperature / during operation-
ambient temperature / during storage-
● minimum-40 °C
● maximum75 °C
number of test cycles / for environmental testing / acc. to IEC 60068-2-306
reference code-
● acc. to DIN EN 61346-2F
● acc. to IEC 81346-2F
Weight0.320 kg
Dimensions40.00 × 92.00 × 84.00 mm

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