Siemens 5SJ4340-7HG42 Miniature Circuit Breaker 3-Pole, 40A, C-Curve, 10kA, UL 489 Rated Original Brand New
$161.95
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.
Availability: In stock
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
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Certified Safety: Fully compliant with UL 489 and CSA C22.2, ensuring it meets strict safety codes for branch circuit protection.
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Space-Efficient Design: Compact 3-pole configuration allows for high-density installation in control panels.
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Versatile Application: The C-Trip curve is optimized for circuits with moderate inrush currents, such as lighting and small motor loads.
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Global Standard: Engineered by Siemens to provide consistent performance across international power systems.
Function
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Protects electrical circuits from overload and short-circuit conditions
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Automatically interrupts current flow during fault conditions
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Ensures stable and safe operation of electrical distribution systems
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Suitable for commercial, industrial, and infrastructure installations
Technical Specification
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Manufacturer: Siemens
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Product Number: 5SJ4340-7HG42
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Type: Circuit Breaker (MCB)
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Number of Poles: 3-Pole
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Rated Current: 40 A
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Tripping Characteristic: C-Curve
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Breaking Capacity: 10kA
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Voltage Rating: 480Y/277V
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Standard: UL 489
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| Weight | 0.501 kg |
|---|---|
| Dimensions | 57.00 × 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 | 3 |
| tripping characteristic class | C |
| 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 | 4.8 W |
| operational current | – |
| ● at 30 °C / rated value | 40 A |
| ● at 40 °C / rated value | 40 A |
| ● at 45 °C / rated value | 38.8 A |
| ● at 50 °C / rated value | 38 A |
| ● at 55 °C / rated value | 37 A |
| ● at 60 °C / rated value | 36 A |
| ● at AC / rated value | 40 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 | 3 |
| 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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