5SY4208-8 Siemens Miniature Circuit Breaker 400 V 10kA Original Brand New


  • 5SY4208-8
  • Actuator Type:Toggle
  • Alternate Mfr Part Number:5SY4208-8
  • Approvals:UL 1077
  • Characteristic:D Curve
  • Current Rating:8 A
  • Mounting Type:DIN Rail Mount
  • Number of Poles:2 Pole
  • Series:5SY Series
  • Standards:UL 1077
  • Termination:Screws
  • Type:Thermal/Magnetic
  • UPC Code:754554876009
  • Voltage Rating:480 VAC

Availability: 234 in stock

Siemens Miniature Circuit Breaker 400 V 10kA – 5SY4208-8

MCBs from the Siemens SENTRON portfolio meet the enhanced requirements of automated buildings and industrial power supply systems, e.g. in the automotive and semiconductor industry or in data centers. Compared to residential and functional buildings, these are usually more extensive and complex in terms of both network topology and operation. Electricity and production downtimes must be deliberately prevented in these cases using coordinated device combinations if economic losses are to be avoided. Our MCBs protect wires and cables in cases of short circuit and overloads, and also enable backup protection for switching devices and also semiconductor protection. They are therefore a fundamental component in end-to-end protection concepts for industry and infrastructure.

The right combination

The main purpose of siemens miniature circuit breakers is to permanently monitor and secure cables and wires in electrical systems. They also help protect humans against electric shocks when used in combination with RCCBs or as combined RCBO. Combining the 5SY MCB with the 5SM6 arc-fault detection unit (AFDD) further expands the range of functions. An overview of all the combinations is provided below.

Strengths of the Siemens MCBs in the SENTRON portfolio – your benefits

  • Convenient to install and connect
  • Uniform additional components
  • Consistent design
  • Ergonomically formed devices


Siemens 5SY4208-8, Miniature circuit breaker 400 V 10kA, 2-pole, D, 8A, D=70 mm


DataSheet in PDF

Weight 0.309 kg
Dimensions 40.00 × 92.00 × 84.00 mm


product brand name


product designation

Miniature circuit breaker

design of the product

For railway applications

number of poles


design of pole


tripping characteristic class


mechanical service life (switching cycles) / typical

10 000

overvoltage category


degree of pollution


type of voltage / of the operating voltage


insulation voltage (Ui)

● with single-phase operation / at AC / rated value

440 V

● with multi-phase operation / at AC / rated value

440 V

supply voltage

operating voltage / at DC / rated value / maximum

72 V

protection class IP

IP20, with connected conductors

switching capacity current

● acc. to EN 60898 / rated value

10 kA

power loss [W] / for rated value of the current / at AC / in hot operating state / per pole

0.8 W

operational current

● at 35 °C / rated value

8 A

● at 40 °C / rated value

7.35 A

● at 45 °C / rated value

7 A

● at 50 °C / rated value

6.63 A

● at 55 °C / rated value

6.25 A

● at 60 °C / rated value

5.83 A

● at AC / rated value

8 A

suitability for operation

Mechanical engineering / industry

product component / neutral conductor switching


product feature / touch protection


product component

● combined terminal top


● combined terminal bottom


product feature

● properties for main switches in accordance with EN 60204-1


● halogen-free


● sealable


● silicon-free


product extension / installable / supplementary devices


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 cord


installation depth

70 mm

number of modular width units


fastening method

Quick assembly system

mounting position


influence of the surrounding temperature

max. 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

● maximum

75 °C

number of test cycles / for environmental testing / acc. to IEC 60068-2-30


reference code

● acc. to DIN EN 61346-2


● acc. to IEC 81346-2



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