ZHEJIANG SIPUN ELECTRIC CO., LTD. – ST3-2.5/3-3 Triple Deck Spring Terminal Block

Product Overview

ZHEJIANG SIPUN ELECTRIC CO., LTD. presents the ST3-2.5/3-3, an advanced triple-level spring clamp terminal block engineered for maximum wiring density and efficiency. This terminal block features a sophisticated three-in-three-out configuration, providing nine independent connection points across three vertical levels. It is designed for complex electrical distribution in industrial control systems, power distribution panels, and other applications where space optimization and high-density wiring are critical.

Technical Specifications

The following table summarizes the key technical parameters for the ST3-2.5/3-3 terminal block:

Product Applications & Usage

The unique three-in-three-out (triple-level) design of the ST3-2.5/3-3 makes it an ideal solution for complex and space-constrained wiring scenarios:

• Ultra-High-Density Control Cabinets: The triple-level vertical structure allows for up to nine connections in the footprint of a single traditional terminal, drastically increasing the wiring density in control cabinets, PLC systems, and compact junction boxes .
• Complex Circuit Distribution: This terminal block is perfect for managing multiple circuits and signals in a centralized point, enabling:
  • Multi-Circuit Branching: Efficiently splitting three input circuits into three separate outputs each on different levels.
  • Signal Aggregation and Distribution: Combining multiple input signals and distributing them to various output devices simultaneously, ideal for sensor clusters and actuator arrays in automation.
  • Potential Distribution: Facilitating the distribution of the same electrical potential to multiple devices across different levels.
• Space-Optimized Panels: By accommodating nine connections in a minimal space, it is perfect for complex panels in industrial automation, process control systems, and telecommunication infrastructure, where real estate is at a premium.

Spring Clamp Technology Advantages

The ST3-2.5/3-3 utilizes reliable spring clamp technology, which offers significant benefits over traditional connection methods:

1. Tool-Free, Rapid Installation: Conductors can be connected quickly and securely with a simple push-in action, eliminating the need for torquing tools and drastically reducing wiring time, which is especially valuable when dealing with a high number of connections.
2. Exceptional Vibration Resistance: The constant force exerted by the stainless steel spring ensures a stable, gas-tight connection that is highly resistant to loosening caused by vibration or thermal cycling, which is crucial in demanding environments like heavy machinery and transportation.
3. Long-Term Reliability and Maintenance-Free: The spring mechanism automatically maintains optimal contact pressure on the conductor over time, preventing cold flow and oxidation, which leads to a maintenance-free connection.
4. Easy Inspection and Maintenance: The design allows for visual verification of proper wire insertion. A standard screwdriver can be used to open the clamp via the test opening for easy circuit testing or wire modifications.
5. High Safety and Durability: The housing is made from flame-retardant PA66 material (UL94 V-0) , and the tin-plated copper contacts provide excellent conductivity and corrosion resistance, ensuring safe operation in various environmental conditions.

Comprehensive System Solution

This terminal block is part of a complete wiring system and is compatible with a range of accessories from ZHEJIANG SIPUN ELECTRIC CO., LTD.:

• Protective End Cover / Barrier: Cover ST3-2.5/3-3G provides finger safety and helps meet IP20 protection requirements.
• Bridging Components: Fork type Jumper FBS 10-5 allows for the creation of continuous potential groups across multiple terminal blocks on the same level.
• Identification: Marker ZB5 enables clear and permanent circuit identification across all three levels for easy maintenance and troubleshooting.

Compliance and Quality Assurance

The ST3-2.5/3-3 Triple Deck Spring Terminal Block is manufactured in compliance with international and national standards, including:

• IEC 60947-7-1 & IEC 60947-7-2
• GB14048.7 & GB14048.8

Manufactured by ZHEJIANG SIPUN ELECTRIC CO., LTD. under a strict quality management system, the product undergoes rigorous testing to ensure consistent performance, electrical safety, and long-term durability.