Siemens 5SJ4120-8HG42 Miniature Circuit Breaker 1-Pole, 20A, 277V, Type D Curve Original Brand New
$53.33
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.
Availability: In stock
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
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Global Compliance: Certified according to UL 489 and CSA C22.2, making it suitable for worldwide export and use in North American branch circuits.
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Space-Saving Design: The compact 1-pole construction allows for efficient rail mounting in crowded control panels.
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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.
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Enhanced Safety: Provides visible trip indication and secure terminal connections to prevent accidental contact.
Function & Technical Specification
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Number of Poles: 1-Pole
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Tripping Characteristic: Type D (Standard for inductive loads)
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Rated Current: 20 Amperes
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Rated Voltage: 277V AC / 60V DC
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Breaking Capacity: 10kA at 277V
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Mounting: DIN Rail (Standard 35mm)
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Standards: UL 489, IEC/EN 60947-2
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| Weight | 0.174 kg |
|---|---|
| Dimensions | 22.00 × 125.00 × 84.00 mm |
| Brand | SIEMENS |
| product brand name | SENTRON |
| product designation | Miniature circuit breakers |
| design of the product | Miniature circuit-breaker 5SJ4 |
| number of poles | 1 |
| tripping characteristic class | D |
| mechanical service life (switching cycles) / typical | 10 000 |
| installation environment regarding EMC | Suitable for environment B (immunity to interference not applicable) |
| reference code / acc. to DIN 40719 extended according to IEC 204-2 / acc. to IEC 750 | F |
| overvoltage category | 3 |
| degree of pollution | 3 |
| type of voltage / of the operating voltage | AC/DC |
| insulation voltage (Ui) / at AC / rated value | 440 V |
| supply voltage / at AC / rated value | 400 V |
| operating voltage | – |
| ● at AC / acc. to UL 489 and CSA C22.2 No. 5-02 / maximum | 277 V |
| ● at DC / rated value / maximum | 60 V |
| ● at DC / single channel / acc. to UL 489 and CSA C22.2 No. 5-02 / maximum | 60 V |
| ● at DC / 2-channel / acc. to UL 489 and CSA C22.2 No. 5-02 / maximum | 125 V |
| protection class IP | IP20, with connected conductors, IP 40 in the handle range |
| switching capacity current | – |
| ● acc. to EN 60898 / rated value | 10 kA |
| ● acc. to IEC 60947-2 / rated value | 15 kA |
| power loss [W] / for rated value of the current / at AC / in hot operating state / per pole | 2.4 W |
| operational current | – |
| ● at 30 °C / rated value | 20 A |
| ● at 40 °C / rated value | 20 A |
| ● at 45 °C / rated value | 19.4 A |
| ● at 50 °C / rated value | 18.8 A |
| ● at 55 °C / rated value | 18.1 A |
| ● at 60 °C / rated value | 17.6 A |
| ● at AC / rated value | 20 A |
| type of voltage supply / at AC / acc. to UL 489 and CSA C22.2 No. 5-02 | 480/277 |
| suitability for operation | Mechanical engineering / industry |
| product component / neutral conductor switching | No |
| product feature / touch protection | Yes |
| product component | – |
| ● tunnel terminals top | No |
| ● tunnel terminals bottom | No |
| ● combined terminal top | Yes |
| ● combined terminal bottom | Yes |
| product feature | – |
| ● halogen-free | Yes |
| ● sealable | Yes |
| ● silicon-free | Yes |
| product extension / installable / supplementary devices | Yes |
| product function / note | Terminal 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.235 | 10 kA |
| connectable conductor cross-section / finely stranded / with core end processing | – |
| tightening torque / with screw-type terminals / maximum | 3.5 N·m |
| position / of power supply cord | Any |
| installation depth | 70 mm |
| number of modular width units | 1 |
| fastening method | on standard mounting rail |
| mounting position | any |
| vibration resistance | 50 m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec) |
| ambient temperature / during operation | – |
| ambient temperature / during storage | – |
| ● minimum | -40 °C |
| ● maximum | 75 °C |
| reference code | – |
| ● acc. to DIN EN 61346-2 | F |
| ● acc. to IEC 81346-2 | F |
| Miscellaneous | – |
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