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Siemens 5SY4240-7 Miniature Circuit Breaker 2-Pole, 40A, C-Curve, 10kA, 400V
Siemens 5SY4240-7 Miniature Circuit Breaker 2-Pole, 40A, C-Curve, 10kA, 400V
Siemens 5SY4240-7 Miniature Circuit Breaker 2-Pole, 40A, C-Curve, 10kA, 400V
Siemens 5SY4240-7 Miniature Circuit Breaker 2-Pole, 40A, C-Curve, 10kA, 400V
Siemens 5SY4240-7 Miniature Circuit Breaker 2-Pole, 40A, C-Curve, 10kA, 400V
Siemens 5SY4240-7 Miniature Circuit Breaker 2-Pole, 40A, C-Curve, 10kA, 400V

SIEMENS

Siemens 5SY4240-7 Miniature Circuit Breaker 2-Pole, 40A, C-Curve, 10kA, 400V Original Brand New

Model / SKU5SY4240-7

Siemens 5SY4240-7 is a high-performance 2-pole miniature circuit breaker (MCB) designed for superior circuit protection. Featuring a 40A current rating and C-Trip characteristic, it provides reliable safeguarding against overloads and short circuits in industrial and commercial applications.

Original price was: $129.80.Current price is: $67.47.
In stockShips in 1–3 business days
  • ConditionOriginal Brand New
  • Warranty12 months
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Description

Overview

The Siemens 5SY4240-7 Miniature Circuit Breaker (MCB) is a high-performance electrical protection device designed to safeguard electrical circuits from overloads and short circuits. Built to Siemens’ strict quality standards, this 2-pole MCB offers reliable protection in residential, commercial, and industrial electrical installations.

With a rated current of 40A, C-curve tripping characteristic, and short-circuit breaking capacity of 10kA, it ensures stable and safe circuit operation under demanding conditions. Its compact 70 mm depth allows easy installation in standard distribution boards.

Benefit

  • Reliable protection against overload and short circuits

  • High breaking capacity for enhanced safety

  • Compact design for space-saving installations

  • Trusted Siemens quality and long service life

  • Suitable for residential, commercial, and industrial use

Function

  • Automatically interrupts electrical flow during overload conditions

  • Protects connected equipment from damage caused by short circuits

  • Ensures stable power distribution in multi-phase systems

  • Supports safe maintenance with fast and precise tripping

Technical Specification

  • Brand: Siemens

  • Product Number: 5SY4240-7

  • Product Type: Miniature Circuit Breaker (MCB)

  • Number of Poles: 2-Pole

  • Rated Voltage: 400 V

  • Rated Current: 40 A

  • Tripping Characteristic: C Curve

  • Breaking Capacity: 10 kA

  • Depth (D): 70 mm

  • Mounting: DIN rail

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Datasheet in PDF

Specifications

SKU / Model5SY4240-7
BrandSIEMENS
product brand nameSENTRON
product designationMiniature circuit breaker
number of poles2
design of pole2P
tripping characteristic classC
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
energy limitation class3
power loss [W] / for rated value of the current / at AC / in hot operating state / per pole3.5 W
operational current-
● at 35 °C / rated value40 A
● at 40 °C / rated value37.56 A
● at 45 °C / rated value36.28 A
● at 50 °C / rated value34.96 A
● at 55 °C / rated value33.6 A
● at 60 °C / rated value32.16 A
● at AC / rated value40 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
Vibration and Shock-
Weight0.316 kg
Dimensions40.00 × 92.00 × 84.00 mm

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