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Siemens 5SJ4120-8HG42 Miniature Circuit Breaker 1-Pole, 20A, 277V, Type D Curve
Siemens 5SJ4120-8HG42 Miniature Circuit Breaker 1-Pole, 20A, 277V, Type D Curve
Siemens 5SJ4120-8HG42 Miniature Circuit Breaker 1-Pole, 20A, 277V, Type D Curve
Siemens 5SJ4120-8HG42 Miniature Circuit Breaker 1-Pole, 20A, 277V, Type D Curve

SIEMENS

Siemens 5SJ4120-8HG42 Miniature Circuit Breaker 1-Pole, 20A, 277V, Type D Curve Original Brand New

Model / SKU5SJ4120-8HG42

High-performance, 1-pole miniature circuit breaker designed for industrial applications. Rated at 20A with a Type D tripping characteristic, it is fully compliant with UL 489 standards for 277V AC systems, ensuring robust branch circuit protection.

Original price was: $122.58.Current price is: $65.94.
In stockShips in 1–3 business days
  • ConditionOriginal Brand New
  • Warranty12 months
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Description

Overview

The Siemens 5SJ4120-8HG42 belongs to the Sentron series, engineered specifically for the demanding requirements of the North American market. This miniature circuit breaker (MCB) provides reliable protection for electrical installations in non-residential buildings and industrial plants. Its 10kA interrupting capacity and Type D tripping curve make it ideal for circuits with high inductive loads.

Benefit

  • Global Compliance: Certified according to UL 489 and CSA C22.2, making it suitable for worldwide export and use in North American branch circuits.

  • Space-Saving Design: The compact 1-pole construction allows for efficient rail mounting in crowded control panels.

  • High Inrush Handling: The Type D characteristic is specifically designed to prevent nuisance tripping during high initial current surges, such as those from motors or transformers.

  • Enhanced Safety: Provides visible trip indication and secure terminal connections to prevent accidental contact.

Function & Technical Specification

  • Number of Poles: 1-Pole

  • Tripping Characteristic: Type D (Standard for inductive loads)

  • Rated Current: 20 Amperes

  • Rated Voltage: 277V AC / 60V DC

  • Breaking Capacity: 10kA at 277V

  • Mounting: DIN Rail (Standard 35mm)

  • Standards: UL 489, IEC/EN 60947-2

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Datasheet in PDF

Specifications

SKU / Model5SJ4120-8HG42
BrandSIEMENS
product brand nameSENTRON
product designationMiniature circuit breakers
design of the productMiniature circuit-breaker 5SJ4
number of poles1
tripping characteristic classD
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-
Weight0.174 kg
Dimensions22.00 × 125.00 × 84.00 mm

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