Siemens Circuit breaker for transformer protection, size S0, 325A Part number 3RV2821-4BD10

Product Overview

The SIRIUS 3RV2 circuit breaker is a specialized, high-performance circuit breaker designed specifically for transformer protection with full UL 489 and CSA C22.2 No. 5-02 approval. This frame size S0 circuit breaker features thermal overload release at 20A and short-circuit release at 325A with screw terminal connections and standard switching capacity, optimized for transformer protection applications.

Key Features

This circuit breaker is specifically engineered for transformer protection according to UL 489/CSA C22.2 No. 5 standards for comprehensive protection of transformers and electrical systems in UL-configured plants. Features enhanced short-circuit protection at 325A, making it ideal for transformer applications requiring robust protection against overcurrent conditions.

Technical Specifications

• Frame Size: S0
• Application: Transformer Protection
• Thermal Overload Release: 20A (A-release)
• Short-Circuit Release: 325A (N-release)
• Number of Poles: 3-pole
• Rated Current: 20A
• Rated Voltage: Up to 690V AC
• Operating Frequency: 50-60Hz
• Connection Type: Screw terminal
• Control Element: Toggle switch operation
• Switching Capacity: Standard switching capacity
• Degree of Protection: IP20
• Weight: 0.516kg
• Dimensions: 55 x 191 x 110mm

Transformer Protection Features

• Enhanced Short-Circuit Protection: 325A N-release specifically designed for transformer inrush current handling
• Thermal Overload Protection: 20A A-release for continuous overload protection
• UL 489 Compliance: Full approval for transformer protection applications
• CSA C22.2 No. 5-02 Compliance: Canadian standards for transformer protection
• Optimized Trip Characteristics: Designed for transformer protection requirements

Breaking Capacity & Performance

• Breaking Capacity: Designed for transformer protection applications
• Inrush Current Handling: Optimized for transformer energization currents
• Coordination: Suitable for selective coordination with upstream protection
• Operating Temperature: -20°C to +60°C
• Mechanical Durability: High-reliability switching mechanism
• Electrical Durability: Extended operational life for transformer applications

Approvals & Standards

• UL 489: Circuit breaker approval for transformer protection
• CSA C22.2 No. 5-02: Canadian standards approval for transformer applications
• IEC Standards: International electrotechnical compliance
• ATEX/IEC Ex: Suitable for hazardous area applications
• UL Listed: Approved for North American markets

Design & Construction

Features robust S0 frame construction specifically designed for transformer protection applications. The device includes screw terminals for secure connections and is optimized for handling transformer inrush currents and providing reliable protection against overcurrent conditions in transformer circuits.

Applications

This circuit breaker is specifically designed for transformer protection applications, including:

• Primary transformer protection in industrial facilities
• Distribution transformer protection
• Power transformer protection in substations
• Transformer protection in UL-configured plants
• Electrical system protection with transformer loads
• Industrial power distribution systems
• Manufacturing facility transformer protection
• Commercial building transformer protection

Mounting & Installation

• Mounting: DIN rail mounting capability
• Installation: Fixed installation technology
• Terminal Configuration: Screw terminals for main circuit
• Wire Range: Standard industrial wire connections
• Mounting Position: Any mounting position suitable
• Panel Integration: Suitable for switchgear and control panel installation

SIRIUS System Integration

• Modular System: Part of the SIRIUS 3RV2 modular system
• Energy Infeed Options: Compatible with SIRIUS 3RV29 infeed system
• Reduced Wiring: Standardized connections reduce main circuit wiring
• System Efficiency: Replaces the well-proven 3RV1 series with enhanced features
• Accessory Compatibility: Compatible with SIRIUS switching and control accessories

Compliance & Certifications

• Country of Origin: Germany
• EAN: 4011209767959
• UPC: 040892934885
• RoHS Compliance: Since 01.10.2009
• WEEE Compliance: Yes
• REACH Regulation: Compliant with current substance restrictions
• Product Class: A: Standard stock item

Operating Characteristics

• Trip Characteristic: Optimized for transformer protection
• Thermal Protection: Overload protection at 20A
• Magnetic Protection: Short-circuit protection at 325A
• Coordination: Designed for selective coordination
• Reset Function: Manual reset after trip operation
• Indication: Visual trip indication for maintenance

Environmental Considerations

The device is designed for industrial transformer protection environments and includes environmental product declarations. It meets WEEE take-back obligations and complies with RoHS substance restrictions for safe disposal and environmental protection.

Performance & Reliability

• Low Heat Loss: Compact and climate-resistant design
• Transformer Optimized: Specifically designed for transformer protection characteristics
• Worldwide Approvals: IEC and UL/CSA certifications
• High Reliability: Proven performance in transformer protection applications
• Maintenance-Friendly: Easy installation and maintenance access

Download existing graphical data for this product:

• Technical Datasheet (PDF)
• CAD Models and Technical Drawings
• Product Documentation
• Environmental Product Declaration