SIPUN ST3-2.5/1X2 TWIN Spring Clamp Terminal Block

ZHEJIANG SIPUN ELECTRIC CO., LTD. presents the ST3-2.5/1X2 TWIN feed-through terminal block, a innovative double-level spring clamp solution designed for efficient electrical distribution in compact spaces. This terminal block features advanced spring clamp technology with a one-in-two-out configuration, providing superior electrical connectivity for industrial applications requiring reliable power distribution.

Technical Specifications

• Conductor Cross-Section: 2.5 mm² to 4.0 mm²
  
• Rated Voltage: 800V AC/DC
  
• Rated Current: 24A
  
• Operating Temperature: -40°C to +120°C
• Contact Material: High-conductivity copper alloy, tin-plated
• Housing Material: PA66 (UL94 V-0 rated)
  
• Spring Material: High-grade stainless steel
• Configuration: One-in-two-out (dual level design)

Product Usage & Applications

The ST3-2.5/1X2 TWIN terminal block features a unique one-in-two-out configuration that allows a single input conductor to be distributed to two separate output circuits. This design is particularly beneficial for:

• Space-Optimized Control Cabinets: The double-level vertical design saves up to 50% space compared to traditional single-level terminals
  
• Branch Circuit Distribution: Ideal for creating multiple branches from a single power source without additional wiring complexity
• Signal Duplication: Perfect for applications where the same signal needs to be sent to multiple devices simultaneously
• Test and Measurement Points: Provides convenient access points for testing while maintaining circuit integrity
• Industrial Control Systems: Suitable for PLCs, motor control centers, and automation systems where space is limited

Spring Clamp Technology Advantages

Spring clamp terminals utilize the tension of a spring to secure cables or conductors, providing electrical connection through mechanical spring force. This technology offers significant benefits:

1. Tool-Free Operation & Rapid Installation
   Conductors can be connected directly by insertion without special tools, significantly reducing wiring time compared to traditional screw terminals. The simple push-in action minimizes installation errors.
2. Exceptional Vibration Resistance
   The constant spring force maintains stable electrical connections even in high-vibration environments, preventing loosening that can lead to contact failure.
   
3. Self-Adjusting Contact Pressure
   The spring mechanism automatically compensates for thermal expansion and contraction, maintaining optimal contact pressure throughout thermal cycling to ensure long-term reliability.
4. Visual Inspection Window
   Transparent housing design allows for quick verification of proper wire insertion and connection status without disassembly.
5. Maintenance-Friendly Design
   Integrated test opening facilitates easy circuit testing and wire modifications. Maintenance is simplified as wires can be easily inserted and removed.
6. Long-Term Stability
   High-quality spring materials maintain tension without significant attenuation over time, ensuring consistent performance throughout the product’s operational lifespan.
7. Corrosion Resistance
   Gold-plated spring mechanism prevents oxidation, enhancing long-term reliability in various environmental conditions.

Space-Saving Design Benefits

The dual-level design of the ST3-2.5/1X2 TWIN terminal block provides exceptional space efficiency:

• Compact Dimensions: Measures approximately 5.2mm (width) × 60.7mm (length) × 35.6mm (height)
  
• High Density Installation: Enables more connections per unit length of DIN rail
• Simplified Wiring: Reduces wiring complexity by integrating distribution functionality within the terminal block itself
• Improved Airflow: The vertical design allows better airflow between connections compared to side-by-side installations

Comprehensive System Solution

The ST3-2.5/1X2 TWIN terminal block integrates seamlessly with a range of accessories to form a complete wiring system:

• Protective End Cover: Cover ST3-2.5/1X2G provides finger protection and meets IP20 requirements
  
• Interconnection: Fork type Jumper FBS 10-5 enables efficient bridging between adjacent terminals
  
• Identification: Marker ZB5 allows for clear, permanent circuit identification
  
• Mounting: Compatible with standard 35mm DIN rails

Compliance Standards

• IEC 60947-7-1 & IEC 60947-7-2
  
• GB14048.7 & GB14048.8
  
• CE certified
• RoHS compliant

Application Fields

• Compact control cabinets and switchgear
• Industrial automation systems
• Power distribution panels with space constraints
• Building management systems
• Transportation equipment and railway systems
• Telecommunications infrastructure
• Renewable energy applications

Quality Assurance

Manufactured by ZHEJIANG SIPUN ELECTRIC CO., LTD. under ISO 9001 quality system with:

• 100% electrical testing
• Mechanical endurance: >1000 wire insertion/extraction cycles
• Environmental resistance testing per IEC 60068-2
• Salt spray testing per ISO 9227 for corrosion resistance
• Thermal cycling testing to ensure performance stability

The ST3-2.5/1X2 TWIN Spring Terminal Block represents an innovative, space-saving solution for modern electrical distribution requirements, combining the reliability of spring clamp technology with the efficiency of dual-level design for optimized panel layout and simplified wiring.