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Siemens 5SY4350-8 Miniature Circuit Breaker 3-Pole, 50A, D-Curve, 10kA, 400V
Siemens 5SY4350-8 Miniature Circuit Breaker 3-Pole, 50A, D-Curve, 10kA, 400V
Siemens 5SY4350-8 Miniature Circuit Breaker 3-Pole, 50A, D-Curve, 10kA, 400V
Siemens 5SY4350-8 Miniature Circuit Breaker 3-Pole, 50A, D-Curve, 10kA, 400V
Siemens 5SY4350-8 Miniature Circuit Breaker 3-Pole, 50A, D-Curve, 10kA, 400V

SIEMENS

Siemens 5SY4350-8 Miniature Circuit Breaker 3-Pole, 50A, D-Curve, 10kA, 400V Original Brand New

Model / SKU5SY4350-8

High-performance 3-pole miniature circuit breaker (MCB) designed for industrial applications. Featuring a 50A rating, Type D tripping characteristic, and a 10kA breaking capacity, it provides reliable protection against short circuits and overloads in 400V systems.

Original price was: $260.80.Current price is: $135.57.
In stockShips in 1–3 business days
  • ConditionOriginal Brand New
  • Warranty12 months
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Description

Overview

The Siemens 5SY4350-8 Miniature Circuit Breaker is engineered to provide superior protection against overloads and short circuits in demanding industrial and commercial electrical installations. Featuring a D-curve characteristic, this MCB is ideal for circuits with high inrush currents such as motors, transformers, and heavy-duty equipment.

Built to Siemens’ stringent quality standards, this 3-pole breaker ensures operational safety, long service life, and consistent performance in high-load environments.

Key Benefit

  • High breaking capacity (10kA) ensures maximum protection against short circuits

  • D-curve tripping characteristic suitable for high inrush current applications

  • 3-pole design for balanced and secure three-phase protection

  • Compact 70 mm depth for easy installation in distribution boards

  • Siemens reliability for long-term operational safety

Function

  • Protects electrical circuits from overload and short-circuit conditions

  • Ensures safe disconnection during fault events

  • Supports industrial-grade power distribution systems

  • Maintains system stability in high-current startup environments

Technical Specification

  • Brand: Siemens

  • Product Number: 5SY4350-8

  • Rated Voltage: 400 V

  • Rated Current: 50 A

  • Breaking Capacity: 10 kA

  • Number of Poles: 3

  • Tripping Characteristic: D Curve

  • Installation Depth: 70 mm

  • Application: Industrial & Commercial Electrical Systems

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Datasheet in PDF

Specifications

SKU / Model5SY4350-8
BrandSIEMENS
product brand nameSENTRON
product designationMiniature circuit breaker
number of poles3
design of pole3P
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 value15 kA
power loss [W] / for rated value of the current / at AC / in hot operating state / per pole3.7 W
operational current-
● at 35 °C / rated value50 A
● at 45 °C / rated value47 A
● at 50 °C / rated value45.95 A
● at 55 °C / rated value44.9 A
● at 60 °C / rated value43.8 A
● at AC / rated value50 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 units3
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
Weight0.487 kg
Dimensions58.00 × 94.00 × 84.00 mm

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