Siemens Miniature circuit breaker 400V 10kA, 3-pole, C, 3A Part number 5SY4303-7

Product Overview

The Siemens miniature circuit breaker 400 V 10 kA, 3-pole, C, 3 A, D = 70 mm, article number 5SY4303-7, is a SENTRON 5SY4 series miniature circuit breaker designed for automatic protection of electrical circuits against overload and short-circuit conditions. This compact 3-pole breaker features a tripping characteristic type C and is suitable for use in industrial and commercial distribution boards and control panels where reliable automatic circuit interruption is required for three-phase circuits.

Key Features

• Miniature circuit breaker for low-voltage circuit protection
• 3-pole design for three-phase circuit protection
• Rated current 3 A
• Tripping characteristic type C for general protective use
• Rated voltage up to 400 V AC
• Breaking capacity 10 kA for reliable fault interruption
• Designed for DIN-rail mounting
• Compact form suitable for distribution boards

Technical Specifications

• Article Number: 5SY4303-7
• Product Family: SENTRON 5SY4 miniature circuit breakers
• Number of Poles: 3
• Rated Current: 3 A
• Tripping Characteristic: Type C
• Rated Operational Voltage: up to 400 V AC
• Breaking Capacity: 10 kA
• Width: Approx. 54 mm (3 width units)
• Height: Approx. 90 mm
• Depth: Approx. 76 mm
• Mounting: DIN-rail installation
• Protection Class: IP20 when installed
• Operating Temperature Range: Standard industrial conditions

Compliance & Standards

• Designed in accordance with IEC/EN standards for miniature circuit breakers
• Suitable for industrial and commercial power distribution protection
• Manufactured to Siemens quality and reliability requirements for low-voltage protective devices

Applications

The Siemens 5SY4303-7 miniature circuit breaker is used for automatic overload and short-circuit protection in three-phase electrical distribution systems. Typical applications include industrial distribution boards, machine control panels, power feeders, and general electrical installations where reliable and compact circuit protection is required for 3 A circuits with type C tripping behaviour.