Siemens ETU, line protection ETU20, 3-pole, 100 - 250A

Product Overview

The Siemens 3VL9325-6SE30 is a high-performance Electronic Trip Unit (ETU) designed for VL250 molded case circuit breakers in 3-pole line protection applications. This ETU20 LSI (Long-time, Short-time, Instantaneous) trip unit features adjustable overload protection (Ir=100...250A) and sophisticated short-circuit protection with both short-time delayed (ISD=1.5 to 10xIr) and instantaneous (II=11 xIN) functions, making it ideal for system and generator protection in industrial and commercial electrical distribution systems.

Key Features

• ETU20 Electronic Trip Unit: Advanced microprocessor-based protection with LSI characteristics for comprehensive system protection
• Adjustable Overload Protection: Ir range of 100-250A with precise current control for optimal equipment protection
• Dual Short-Circuit Protection: Short-time delayed protection (ISD=1.5 to 10xIr) with adjustable time delay (0-0.5s) plus instantaneous protection (II=11 xIN)
• I²t Switching Function: Selectable I²t ON/OFF for enhanced coordination with downstream protective devices
• True RMS Current Measurement: Accurate current monitoring unaffected by harmonics in modern electrical systems
• Thermal Image Protection: Prevents motor overheating by tracking thermal loading history
• Self-Powered Operation: No external auxiliary voltage required - powered by main circuit current transformers
• German Engineering: Manufactured in Germany ensuring premium quality and reliability
• Screw Terminal Connections: Robust connection system included in switching unit scope of delivery
• LED Status Indication: Visual confirmation of proper operation and alarm conditions

Technical Specifications

• Current Rating Range: 100-250A adjustable overload protection (Ir)
• Trip Unit Type: ETU20 (Electronic Trip Unit with LSI functions)
• Number of Poles: 3-pole configuration
• Frame Compatibility: VL250 molded case circuit breaker frame
• Overload Protection: Ir = 100...250A (adjustable)
• Short-Time Delayed Protection: ISD = 1.5 to 10 x Ir with time delay 0-0.5s
• Instantaneous Protection: II = 11 x IN (fixed setting)
• Current Measurement: True RMS for accurate harmonic-rich environment operation
• I²t Function: Selectable constant energy limitation
• Net Weight: 0.747 kg
• Packaging Dimensions: 107.50 x 177.00 x 107.50 mm

Applications

This electronic trip unit is particularly suitable for:

• Industrial electrical distribution systems requiring precise protection coordination
• Generator protection applications with sophisticated control requirements
• Commercial building electrical systems with complex load profiles
• Manufacturing facilities with motor control centers and distribution panels
• Power distribution systems requiring selective coordination with downstream devices
• Infrastructure applications where reliable system protection is critical
• Electrical systems with high harmonic content requiring true RMS measurement
• Applications requiring both thermal overload and short-circuit protection
• Systems needing advanced protection features like I²t energy limitation
• Industrial processes requiring thermal image protection capabilities

Advanced Features

• Microprocessor-Based Control: Advanced digital processing for precise protection and monitoring
• Thermal Image Function: Tracks equipment thermal history to prevent damage from repeated overloads
• Harmonic Immunity: True RMS measurement ensures accurate operation in harmonic-rich environments
• Selective Coordination: I²t switching and adjustable time delays enable proper coordination with upstream/downstream devices
• Self-Diagnostic Capability: Continuous monitoring of trip unit functionality with LED indication
• Energy Independence: Self-powered operation eliminates need for external control power
• Professional Installation: Screw terminal connections ensure reliable long-term performance
• Maintenance-Free Operation: Solid-state electronics require no routine maintenance
• High Breaking Performance: Designed for demanding industrial switching applications
• Temperature Stability: Reliable operation across wide ambient temperature ranges

Compliance & Certifications

• Standards Compliance: Fully compliant with IEC 60947-2 and related international standards for molded case circuit breaker trip units
• German Manufacturing: Manufactured in Germany under strict quality control standards
• RoHS Compliance: Compliant since July 1, 2006
• REACH Regulation: Contains lead and other substances as documented - safe when used as intended
• Export Control: AL: N / ECCN: N
• Product Class: C - Products manufactured to order, cannot be reused or returned against credit

Environmental & Safety Information

This product contains lead and other substances in concentrations higher than 0.1% weight by weight (w/w) as per REACH Art. 33 requirements. Based on current information, these substances do not pose any risk when the product is used as intended, including disposal. Please refer to product documentation for complete safety information.

Download existing graphical data for this product:

• Product Datasheet
• Installation Manual
• SENTRON Product Catalog
• Technical Documentation