SIPUN ST3-16 Spring Clamp Terminal Block

ZHEJIANG SIPUN ELECTRIC CO., LTD. presents the ST3-16 high-capacity feed-through terminal block, engineered with advanced spring clamp technology for superior electrical connectivity in demanding high-current applications. Designed for robust performance, this terminal block ensures reliable power distribution in industrial control systems, power cabinets, and heavy-duty equipment requiring exceptional current carrying capacity.

Technical Specifications

• Conductor Cross-Section: 2.5 mm² to 25.0 mm²
• Rated Voltage: 800V AC/DC
• Rated Current: 90A
• 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
  

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. This makes them suitable for applications like railway and heavy machinery.
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
   Stainless steel spring mechanism prevents oxidation, enhancing long-term reliability in various environmental conditions.

Comprehensive System Solution

The ST3-16 terminal block integrates seamlessly with a range of accessories to form a complete wiring system:

• Protective End Cover: Cover ST3-16G provides finger protection and meets IP20 requirements
• Interconnection: Fork type Jumper FBS 10-12 enables efficient bridging between adjacent terminals rated for high current
• Identification: Marker ZB12 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

• High-current power distribution systems and switchgear
• Industrial control panels and motor control centers (MCCs)
• Renewable energy installations (solar inverters, wind power)
• Railway and transportation systems
• Building automation and control systems
• Heavy machinery and equipment

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 ST3-16 Spring Terminal Block represents a cost-effective and highly reliable connection technology solution for robust electrical systems requiring high current capacity and operational reliability.