5SJ4308-7HG42 Siemens Miniature Circuit Breaker 0 kA Original Brand New

Siemens Miniature Circuit Breaker 0 kA – 5SJ4308-7HG42

MCBs from the Siemens SENTRON portfolio meet the enhanced requirements of automated buildings and industrial power supply systems, e.g. in the automotive and semiconductor industry or in data centers. Compared to residential and functional buildings, these are usually more extensive and complex in terms of both network topology and operation. Electricity and production downtimes must be deliberately prevented in these cases using coordinated device combinations if economic losses are to be avoided. Our Siemens MCBs protect wires and cables in cases of short circuit and overloads, and also enable backup protection for switching devices and also semiconductor protection. They are therefore a fundamental component in end-to-end protection concepts for industry and infrastructure.

The right combination

The main purpose of Siemens miniature circuit breakers is to permanently monitor and secure cables and wires in electrical systems. They also help protect humans against electric shocks when used in combination with RCCBs or as combined RCBO. Siemens Breaker combining the 5SY MCB with the 5SM6 arc-fault detection unit (AFDD) further expands the range of functions. An overview of all the combinations is provided below.

5SJ43087HG42

Siemens 5SJ4308-7HG42, Miniature circuit breaker 0 kA, 3-pole, C, 8A according to UL 489-480Y/277V

Model
product brand name		SENTRON
product designation		Miniature circuit breakers
design of the product		Miniature circuit-breaker 5SJ4
General technical data
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
Voltage
type of voltage / of the operating voltage		AC/DC
insulation voltage (Ui) / at AC / rated value		440 V
Supply voltage
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
protection class IP		IP20, with connected conductors, IP 40 in the handle range
Switching capacity
switching capacity current
● acc. to EN 60898 / rated value		10 kA
● acc. to IEC 60947-2 / rated value		15 kA
Dissipation
power loss [W] / for rated value of the current / at AC / in hot operating state / per pole		2.6 W
Current
operational current
● at 30 °C / rated value		8 A
● at 40 °C / rated value		8 A
● at 45 °C / rated value		7.8 A
● at 50 °C / rated value		7.6 A
● at 55 °C / rated value		7.4 A
● at 60 °C / rated value		7.2 A
● at AC / rated value		8 A
Main circuit
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 details
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
product function / note		Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in
Short circuit
breaking capacity short-circuit current (Icn) / at AC / acc. to UL 1077 and CSA C22.2 No.235		10 kA
Connections
connectable conductor cross-section / finely stranded / with core end processing
● minimum		0.75 mm²
● maximum		25 mm²
tightening torque / with screw-type terminals / maximum		3.5 N·m
position / of power supply cord		Any
Mechanical Design
height		121 mm
width		54 mm
depth		70 mm
installation depth		70 mm
number of modular width units		3
fastening method		on standard mounting rail
mounting position		any
net weight		494 g
Environmental conditions
vibration resistance		50 m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)
ambient temperature / during operation
● minimum		55 °C
● maximum		-25 °C
ambient temperature / during storage
● minimum		-40 °C
● maximum		75 °C
Certificates
reference code
● acc. to DIN EN 61346-2		F
● acc. to IEC 81346-2		F
General Product Approval Declaration of Conformity Test Certificates Special Test Certificate other Miscellaneous
Further information
Information- and Downloadcenter (Catalogs, Brochures,…) http://www.siemens.com/lowvoltage/catalogs
Industry Mall (Online ordering system) https://mall.industry.siemens.com/mall/en/en/Catalog/product?mlfb=5SJ4308-7HG42
Service&Support (Manuals, Certificates, Characteristics, FAQs,…) https://support.industry.siemens.com/cs/ww/en/ps/5SJ4308-7HG42
Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, …) http://www.automation.siemens.com/bilddb/cax_en.aspx?mlfb=5SJ4308-7HG42
CAx-Online-Generator http://www.siemens.com/cax
Tender specifications http://www.siemens.com/specifications
Date 10/26/2021

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