Siemens Fault signal contact, 2NO for mini circuit breaker Part number 5ST3021

Product Overview

The Siemens 5ST3021 is a professional fault signal contact accessory designed for monitoring and signaling the automatic tripping status of Siemens miniature circuit breakers and residual current devices. This dual normally open (2 NO) contact module provides essential status feedback for building management systems, alarm panels, and monitoring applications, enabling remote indication when circuit protection devices have automatically tripped due to overload, short circuit, or earth leakage faults.

Key Features

• Dual Contact Configuration: Features 2 normally open (NO) contacts for versatile signaling applications
• Universal Compatibility: Compatible with 5SL, 5SY, 5SP miniature circuit breakers, RCBO 5SU1, and RCD 5SV series
• Fault Detection: Signals automatic tripping only - does not activate during manual operation
• Easy Retrofit Installation: Can be universally retrofitted to existing circuit breaker installations
• Professional Integration: Designed for integration with building management and alarm systems
• Reliable Operation: Manufactured in India with Siemens quality standards for dependable performance

Technical Specifications

• Contact Configuration: 2 normally open (NO)
• Compatible Products: 5SL, 5SY, 5SP miniature circuit breakers, RCBO 5SU1, RCD 5SV
• Special Requirements: For 5SU1 applications, handle coupler 5ST3805-1 is required
• Net Weight: 0.063 kg
• Packaging Dimensions: 82.00 x 92.00 x 18.00 mm
• Country of Origin: India
• EAN: 4001869187440

Applications

This fault signal contact is particularly suitable for:

• Building management system integration
• Remote fault monitoring and alarming
• Electrical system status indication
• Control panel alarm systems
• Maintenance notification systems
• Automated fault reporting
• Industrial monitoring applications
• Safety system integration
• Energy management systems
• Process control fault indication

Compliance & Certifications

• RoHS Compliance: Compliant since January 1, 2006
• WEEE Directive: Subject to take-back obligations under directive 2012/19/EU
• REACH Regulation: Currently no SVHC substances identified above 0.1% w/w threshold
• Export Control: AL: N / ECCN: N
• Product Class: B - Return restricted, contact Siemens partner for returns

Product Classification

• eClass: 27-14-35-02 (versions 6-14)
• ETIM: EC001286 (versions 7-9)
• UNSPSC: 39-12-15-22
• IDEA: 4744
• Product Group: 5506

Download existing graphical data for this product:

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