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Siemens 5SJ4340-7HG42 Miniature Circuit Breaker 3-Pole, 40A, C-Curve, 10kA, UL 489 Rated
Siemens 5SJ4340-7HG42 Miniature Circuit Breaker 3-Pole, 40A, C-Curve, 10kA, UL 489 Rated
Siemens 5SJ4340-7HG42 Miniature Circuit Breaker 3-Pole, 40A, C-Curve, 10kA, UL 489 Rated
Siemens 5SJ4340-7HG42 Miniature Circuit Breaker 3-Pole, 40A, C-Curve, 10kA, UL 489 Rated

SIEMENS

Siemens 5SJ4340-7HG42 Miniature Circuit Breaker 3-Pole, 40A, C-Curve, 10kA, UL 489 Rated Original Brand New

Model / SKU5SJ4340-7HG42

High-performance, 3-pole miniature circuit breaker designed for industrial branch circuit protection. Rated at 40 Amps with a C-Trip characteristic, it provides reliable 10kA overcurrent protection according to UL 489 standards for 480Y/277V systems.

Original price was: $578.77.Current price is: $311.31.
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  • ConditionOriginal Brand New
  • Warranty12 months
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Description

Overview

The Siemens 5SJ4340-7HG42 belongs to the esteemed Sentron family, specifically engineered for the North American market. This miniature circuit breaker (MCB) is designed for "branch circuit protection," making it ideal for protecting electrical loads in complex industrial environments. Its robust construction ensures longevity and safety in demanding conditions, handling voltages up to 480Y/277V AC.

Key Benefit

  • Certified Safety: Fully compliant with UL 489 and CSA C22.2, ensuring it meets strict safety codes for branch circuit protection.

  • Space-Efficient Design: Compact 3-pole configuration allows for high-density installation in control panels.

  • Versatile Application: The C-Trip curve is optimized for circuits with moderate inrush currents, such as lighting and small motor loads.

  • Global Standard: Engineered by Siemens to provide consistent performance across international power systems.

Function

  • Protects electrical circuits from overload and short-circuit conditions

  • Automatically interrupts current flow during fault conditions

  • Ensures stable and safe operation of electrical distribution systems

  • Suitable for commercial, industrial, and infrastructure installations

Technical Specification

  • Manufacturer: Siemens

  • Product Number: 5SJ4340-7HG42

  • Type: Circuit Breaker (MCB)

  • Number of Poles: 3-Pole

  • Rated Current: 40 A

  • Tripping Characteristic: C-Curve

  • Breaking Capacity: 10kA

  • Voltage Rating: 480Y/277V

  • Standard: UL 489

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Datasheet in PDF

Specifications

SKU / Model5SJ4340-7HG42
BrandSIEMENS
product brand nameSENTRON
product designationMiniature circuit breakers
design of the productMiniature circuit-breaker 5SJ4
number of poles3
tripping characteristic classC
mechanical service life (switching cycles) / typical10 000
installation environment regarding EMCSuitable for environment B (immunity to interference not applicable)
reference code / acc. to DIN 40719 extended according to IEC 204-2 / acc. to IEC 750F
overvoltage category3
degree of pollution3
type of voltage / of the operating voltageAC/DC
insulation voltage (Ui) / at AC / rated value440 V
supply voltage / at AC / rated value400 V
operating voltage-
● at AC / acc. to UL 489 and CSA C22.2 No. 5-02 / maximum277 V
● at DC / rated value / maximum60 V
● at DC / single channel / acc. to UL 489 and CSA C22.2 No. 5-02 / maximum60 V
● at DC / 2-channel / acc. to UL 489 and CSA C22.2 No. 5-02 / maximum125 V
protection class IPIP20, with connected conductors, IP 40 in the handle range
switching capacity current-
● 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 pole4.8 W
operational current-
● at 30 °C / rated value40 A
● at 40 °C / rated value40 A
● at 45 °C / rated value38.8 A
● at 50 °C / rated value38 A
● at 55 °C / rated value37 A
● at 60 °C / rated value36 A
● at AC / rated value40 A
type of voltage supply / at AC / acc. to UL 489 and CSA C22.2 No. 5-02480/277
suitability for operationMechanical engineering / industry
product component / neutral conductor switchingNo
product feature / touch protectionYes
product component-
● tunnel terminals topNo
● tunnel terminals bottomNo
● combined terminal topYes
● combined terminal bottomYes
product feature-
● halogen-freeYes
● sealableYes
● silicon-freeYes
product extension / installable / supplementary devicesYes
product function / noteTerminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in
breaking capacity short-circuit current (Icn) / at AC / acc. to UL 1077 and CSA C22.2 No.23510 kA
connectable conductor cross-section / finely stranded / with core end processing-
tightening torque / with screw-type terminals / maximum3.5 N·m
position / of power supply cordAny
installation depth70 mm
number of modular width units3
fastening methodon standard mounting rail
mounting positionany
vibration resistance50 m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)
ambient temperature / during operation-
ambient temperature / during storage-
● minimum-40 °C
● maximum75 °C
reference code-
● acc. to DIN EN 61346-2F
● acc. to IEC 81346-2F
Miscellaneous-
Weight0.501 kg
Dimensions57.00 × 125.00 × 84.00 mm

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