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Siemens 5SY4120-6 Miniature Circuit Breaker 230/400V, 10kA, 1-Pole, B Curve, 20A
Siemens 5SY4120-6 Miniature Circuit Breaker 230/400V, 10kA, 1-Pole, B Curve, 20A
Siemens 5SY4120-6 Miniature Circuit Breaker 230/400V, 10kA, 1-Pole, B Curve, 20A
Siemens 5SY4120-6 Miniature Circuit Breaker 230/400V, 10kA, 1-Pole, B Curve, 20A
Siemens 5SY4120-6 Miniature Circuit Breaker 230/400V, 10kA, 1-Pole, B Curve, 20A
Siemens 5SY4120-6 Miniature Circuit Breaker 230/400V, 10kA, 1-Pole, B Curve, 20A

SIEMENS

Siemens 5SY4120-6 Miniature Circuit Breaker 230/400V, 10kA, 1-Pole, B Curve, 20A Original Brand New

Model / SKU5SY4120-6

High-performance 1-pole Miniature Circuit Breaker (MCB) designed for superior electrical protection. Featuring a 20A rated current and Type B tripping characteristic, it provides reliable short-circuit and overload protection for 230/400V systems with a 10kA breaking capacity.

Original price was: $14.90.Current price is: $7.74.
Available on backorder
  • ConditionOriginal Brand New
  • Warranty12 months

Backorder available · Factory lead time 2–3 weeks.

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Description

Overview

The Siemens 5SY4120-6 is a high-performance miniature circuit breaker (MCB) designed for reliable protection of electrical circuits. Rated for 230/400V with a breaking capacity of 10kA, this 1-pole, B-curve MCB ensures safe operation and prevents overcurrent damage in residential, commercial, and industrial electrical systems. Its compact design (D=70mm) makes it perfect for modern electrical panels with space constraints.

Key Features & Benefit

Reliable Protection:

  • Prevents overloads and short circuits with a 10kA breaking capacity.

  • B-curve tripping characteristics ideal for residential and light commercial use.

Compact & Efficient Design:

  • Slim 1-pole configuration (D=70mm) fits easily in standard distribution boards.

  • Space-saving design without compromising performance.

High Compatibility:

  • Operates seamlessly at 230/400V, supporting single-phase and multiphase systems.

Durable & Safe:

  • Siemens quality ensures long-lasting performance.

  • Meets international safety standards for electrical protection.

Function

  • Tripping Characteristic B: Optimized for the protection of generators, persons, and very long cables.

  • 10kA Breaking Capacity: High switching capacity suitable for most standard industrial distribution tasks.

  • 1-Pole Configuration: Designed for single-phase circuit protection.

  • Compact Dimensions: Standard 70mm depth for seamless integration into Siemens SENTRON portfolios.

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Specifications

SKU / Model5SY4120-6
BrandSIEMENS
product brand nameSENTRON
product designationMiniature circuit breaker
design of the productFor railway applications
number of poles1
design of pole1P
tripping characteristic classB
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-
● acc. to EN 60898 / rated value10 kA
energy limitation class3
power loss [W] / for rated value of the current / at AC / in hot operating state / per pole2.2 W
operational current-
● at 35 °C / rated value20 A
● at 40 °C / rated value18.38 A
● at 45 °C / rated value17.5 A
● at 50 °C / rated value16.58 A
● at 55 °C / rated value15.62 A
● at 60 °C / rated value14.58 A
● at AC / rated value20 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 60204-1No
● halogen-freeYes
● sealableYes
● silicon-freeYes
product extension / installable / supplementary devicesYes
connectable conductor cross-section / solid-
connectable conductor cross-section / stranded-
connectable conductor cross-section / finely stranded / with core end processing-
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 units1
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 60068-2-3028
reference code-
● acc. to DIN EN 61346-2F
● acc. to IEC 81346-2F
Weight0.165 kg
Dimensions21.00 × 93.00 × 83.00 mm

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