Siemens Miniature circuit breaker, D-curve, 3-pole 400V, 10A Part number 5SY8310-8

Product Overview

The Siemens 5SY8310-8 is a SENTRON 5SY8-series miniature circuit breaker (MCB), 3-pole configuration, designed for low-voltage electrical distribution and circuit protection. It provides reliable overload and short-circuit protection for industrial, commercial, and residential electrical installations. The compact 3-pole design and DIN-rail mounting make it suitable for installation in distribution boards and control panels.

Key Features

• 3-pole miniature circuit breaker (3P)
• Rated current: 10 A
• Rated voltage: 400 V AC (also suitable for 230 V single-phase supply)
• High breaking capacity — up to 25 kA (per EN 60947-2)
• Tripping characteristic: Class D (suitable for inductive or motor loads)
• DIN-rail mounting, suitable for compact distribution boards
• Touch-protection, halogen-free design, sealable terminals with combined top/bottom connections

Technical Specifications

• Article Number: 5SY8310-8
• Product Family: SENTRON 5SY8 miniature circuit breaker series
• Number of Poles: 3 (3P)
• Rated Current (In): 10 A
• Rated Voltage (Ue): 400 V AC
• Supply Voltage (single-phase): 230 V AC
• Tripping Characteristic: Class D
• Breaking Capacity (Icu / Icn): 25 kA according to EN 60947-2
• Rated Insulation Voltage (Ui): 440 V AC
• Poles Protected: 3P
• Protection Class: IP20 (with connected conductors)
• Connection Cross-Section (solid / stranded): 0.75 … 35 mm²
• Mounting Width: 3 modular units
• Dimensions (approx. H × W × D): 90 mm × 54 mm × 76 mm
• Net Weight: approx. 0.444 kg

Compliance & Certifications

• Compliant with EN 60947-2 standards for circuit protection devices
• Designed for industrial, commercial and residential applications per relevant safety and installation standards
• RoHS-compliant and halogen-free construction

Applications

Ideal for protection of distribution circuits in electrical panels, the 5SY8310-8 is used to safeguard lighting, motor, and general power circuits from overloads and short-circuits. It is suitable for small to medium industrial installations, commercial buildings, and residential distribution boards requiring 3-phase protection. It also serves well in machine control panels, HVAC systems, and distribution boards where compact 3-pole circuit protection is needed.