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Siemens 5SJ4120-7HG42 20A 1-Pole Circuit Breaker, 10kA, UL 489, 277V
Siemens 5SJ4120-7HG42 20A 1-Pole Circuit Breaker, 10kA, UL 489, 277V
Siemens 5SJ4120-7HG42 20A 1-Pole Circuit Breaker, 10kA, UL 489, 277V
Siemens 5SJ4120-7HG42 20A 1-Pole Circuit Breaker, 10kA, UL 489, 277V
Siemens 5SJ4120-7HG42 20A 1-Pole Circuit Breaker, 10kA, UL 489, 277V

SIEMENS

Siemens 5SJ4120-7HG42 20A 1-Pole Circuit Breaker, 10kA, UL 489, 277V Original Brand New

Model / SKU5SJ4120-7HG42

High-performance Siemens 5SJ4120-7HG42 Miniature Circuit Breaker (MCB). Rated for 20A, 1-Pole, Type C characteristic, 10kA interrupting capacity, and UL 489 compliant for up to 277V AC applications.

Original price was: $106.60.Current price is: $57.33.
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  • ConditionOriginal Brand New
  • Warranty12 months
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Description

Overview

The Siemens 5SJ4120-7HG42 is a high-quality, reliable 1-pole circuit breaker designed to provide superior protection for your electrical systems. With a 10kA short-circuit breaking capacity and 20A current rating, this breaker is UL 489 approved and compatible with 277V electrical installations. Whether for commercial or residential use, the Siemens 5SJ4120-7HG42 ensures efficient operation and safety by interrupting electrical faults to prevent damage to equipment and minimize fire risks.

Benefit

  • High Breaking Capacity: With a 10kA breaking capacity, this circuit breaker offers enhanced protection against electrical faults, ensuring that your system remains safe even under high fault conditions.

  • Compact & Reliable: Designed as a 1-pole breaker, the Siemens 5SJ4120-7HG42 is space-efficient and ideal for installations with limited panel space.

  • UL 489 Certification: UL 489 compliance ensures the circuit breaker meets rigorous safety and reliability standards for use in industrial and commercial applications.

  • Wide Voltage Range: Suitable for installations up to 277V, providing flexibility across different system types.

  • Easy Installation: The Siemens 5SJ4120-7HG42 is easy to install and maintain, making it an ideal choice for professional electricians and DIY enthusiasts alike.

Product Features

  • Type: 1-Pole Circuit Breaker

  • Current Rating: 20A

  • Short Circuit Breaking Capacity: 10kA

  • Voltage Rating: 277V

  • Compliant with UL 489: Meets the highest safety and performance standards

  • Application: Ideal for residential, commercial, and industrial applications

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Datasheet in PDF

Specifications

SKU / Model5SJ4120-7HG42
BrandSIEMENS
product brand nameSENTRON
product designationMiniature circuit breakers
design of the productMiniature circuit-breaker 5SJ4
number of poles1
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 pole2.4 W
operational current-
● at 30 °C / rated value20 A
● at 40 °C / rated value20 A
● at 45 °C / rated value19.4 A
● at 50 °C / rated value18.8 A
● at 55 °C / rated value18.1 A
● at 60 °C / rated value17.6 A
● at AC / rated value20 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 units1
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-
Weight0.176 kg
Dimensions22.00 × 125.00 × 84.00 mm

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