Siemens Miniature circuit breaker 400V, 25kA, (D) 70mm

Product Overview

The 5SY8 series miniature circuit breaker is a high-performance protective device designed for industrial and commercial electrical installations. This 3-pole circuit breaker provides comprehensive protection against overload and short circuit conditions with 25 kA breaking capacity, featuring C-curve tripping characteristics optimized for general applications including motor and lighting circuits.

Key Features & Specifications

• Current Rating: 63A rated current with C-curve tripping characteristics
• Configuration: 3-pole design with 3 protected poles for comprehensive circuit protection
• Voltage Rating: 400V AC rated voltage, 440V rated insulation voltage
• Breaking Capacity: 25 kA at 230V and 400V according to EN 60947-2
• Impulse Withstand: 4 kV rated impulse withstand voltage (Uimp)
• Dimensions: 70mm built-in depth, 3 modular spacing width
• Protection Class: IP20 degree of protection
• Operating Temperature: -25°C to +55°C ambient temperature range
• Standards Compliance: EN 60947-2, UL 1077 listed

Technical Characteristics

• Frequency: 50 Hz operation with AC voltage type
• Current Limiting: Class 3 current limiting for enhanced protection
• Pollution Degree: 3 suitable for industrial environments
• Overvoltage Category: Category 3 for distribution level protection
• Connection: Supports 0.75-35 mm² conductor cross-section (solid and stranded)
• Additional Equipment: Compatible with auxiliary contacts and accessories
• Installation: DIN rail mounting, not suitable for flush-mounted installation

Applications & Features

Ideal for protecting electrical circuits in industrial facilities, commercial buildings, and infrastructure applications. Perfect for motor protection, lighting circuits, and general distribution protection where reliable overcurrent protection is essential. Features convenient assembly and connection technology as part of the SENTRON protection components family, providing effective personal and system protection through safe shutdown during overload or short circuit conditions.

Safety & Protection

Designed for comprehensive circuit protection with automatic tripping during fault conditions. Provides reliable isolation to prevent equipment damage and ensure personnel safety. Features standardized design with consistent connection technology for easy installation and maintenance.

Compliance & Certifications

• Weight: 0.508 kg, Packaging: 58.00 x 94.00 x 84.00 mm
• Standards: RoHS compliant (since Oct 2006), WEEE compliant, UL 1077 listed
• Origin: Germany, EAN: 4001869263779
• Safety: Contains REACH substances (Lead) at <0.1% w/w - no risk when used as intended

Download existing graphical data for this product:

• Technical Datasheet (PDF)
• Product Support Page
• SENTRON Protection Components Overview
• Industry Mall Product Page