SIEMENS
High-performance, 3-pole miniature circuit breaker designed for industrial applications. It features a 3A current rating, Type D tripping characteristic, and a 10kA breaking capacity. Fully compliant with UL 489 standards for 480Y/277V systems, it ensures robust protection for feeder and branch circuits.
The Siemens 5SJ4 series is engineered specifically for the North American market, providing reliable protection against overloads and short circuits. The 5SJ4303-8HG42 model is a "finger-safe" component that offers easy DIN rail mounting and seamless integration into industrial control panels and machinery.
Certified Safety: Meets UL 489 standards, making it suitable for branch circuit protection in the US and Canada.
High Interrupting Capacity: Rated for 10kA, providing superior protection during high-fault current events.
Space-Efficient: Compact 3-pole design saves valuable rail space in electrical cabinets.
Durability: Built to Siemens’ high-quality engineering standards for a long operational lifespan.
Overload Protection: Safely interrupts power if current exceeds the 3A threshold for a sustained period.
Short-Circuit Protection: Instantaneous tripping via the Type D magnetic mechanism to prevent equipment damage.
System Isolation: Provides a clear manual disconnect point for maintenance and safety.
Type: D, 3-pole circuit breaker
Rated Current: 3 A
Rated Voltage: 480Y/277V
Breaking Capacity: 10kA
Standards Compliance: UL 489 certified
Applications: Suitable for commercial, industrial, and residential electrical systems requiring reliable circuit protection.
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| SKU / Model | 5SJ4303-8HG42 |
|---|---|
| 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 | 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 | 1.8 W |
| operational current | - |
| ● at 30 °C / rated value | 3 A |
| ● at 40 °C / rated value | 3 A |
| ● at 45 °C / rated value | 2.9 A |
| ● at 50 °C / rated value | 2.8 A |
| ● at 55 °C / rated value | 2.7 A |
| ● at 60 °C / rated value | 2.6 A |
| ● at AC / rated value | 3 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 | - |
| Weight | 0.494 kg |
| Dimensions | 57.00 × 125.00 × 84.00 mm |
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