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

1. Product Overview

ZHEJIANG SIPUN ELECTRIC CO., LTD. presents the ST3-2.5/3-3JD, a highly specialized Triple Deck Earthed Terminal Block engineered for advanced electrical systems where safety, grounding integrity, and space optimization converge. This product builds upon the high-density three-in, three-out configuration by integrating a dedicated, high-integrity earthing (grounding) connection alongside the standard equipotential bonding. It is the definitive solution for applications that require not only superior connection density but also a robust, dedicated path for protective earth (PE) conductors, ensuring the highest levels of personnel and equipment safety in control panels and distribution boards.

2. Technical Specifications

3. Applications and Usage

The ST3-2.5/3-3JD is purpose-built for the most safety-conscious and well-organized panel designs.

• Control Panels for Safety-Critical Equipment: Essential in panels controlling machinery, industrial automation systems, or medical equipment, where a fail-safe protective earth connection for metal enclosures, doors, or external components is mandated by safety standards.
• Centralized Earthed Reference Points: Serves as an organized, high-density hub for connecting multiple cable shields, drain wires, or functional earth conductors to the main protective earth, significantly improving EMC performance and grounding clarity.
• Ultra-Compact Multi-Circuit Distribution with Guaranteed Grounding: Ideal for distributing power or signals to three separate zones or devices from a single source, while providing each with a secure, dedicated connection to the earth bar within the same compact module. This eliminates the need for separate earthing terminals, saving space and reducing wiring complexity.

4. Key Features and Advantages

4.1. Dedicated High-Capacity Earthing Function
This is the core differentiator of the “-JD” variant. The terminal block features a specifically designed connection point for the protective earth (PE) conductor.

• Enhanced Safety Compliance: Provides a reliable, permanent, and clearly identifiable point for connecting safety grounds, directly supporting compliance with electrical safety regulations (e.g., IEC 60204-1 for machinery).
• Superior Grounding Integrity: Ensures a low-impedance path for fault currents, facilitating the rapid operation of overcurrent protection devices and minimizing touch voltage hazards.
• Clear Circuit Separation: Physically and visually separates safety earth conductors from signal and power lines within the same block, preventing errors and improving maintenance safety.

4.2. Integrated Equipotential Bonding

• Holistic Safety Mesh: Works in conjunction with the dedicated earth point to create a comprehensive grounding and bonding network within the panel, equalizing potentials between all conductive parts and further mitigating shock and interference risks.

4.3. Unmatched Space Efficiency of Triple-Deck Design

• Maximum Density with Safety: Achieves the highest connection density for its class while incorporating critical safety features (earthing and bonding) that would normally require additional components and space.
• Exceptional Organization: Consolidates nine functional connections plus earth and bonding into one neatly organized unit, offering unparalleled clarity and streamlining the panel layout.

4.4. Reliable Spring-Clamp Connection Technology

• Secure, Vibration-Resistant Connections: Ensures all conductors, including the critical earth wire, remain securely clamped under harsh conditions, maintaining a gas-tight contact for long-term reliability.
• Fast, Tool-Assisted Installation: Simplifies the wiring process for all connection points, reducing assembly time and ensuring consistent, high-quality terminations.

5. Complete System Solution

The ST3-2.5/3-3JD integrates seamlessly into the modular terminal block system from ZHEJIANG SIPUN ELECTRIC CO., LTD.:

• Protective End Cover: Cover ST3-2.5/3-3G provides finger-safe protection and meets IP20 requirements.
• Bridging: Fork type Jumper FBS 10-5 enables the horizontal interconnection of terminals on the same level for potential distribution.
• Identification: Marker ZB5 allows for clear, permanent marking of all circuits, including the vital earth connection.

6. Quality Assurance

Manufactured by ZHEJIANG SIPUN ELECTRIC CO., LTD., the ST3-2.5/3-3JD is produced under a stringent quality management system. It is designed and tested to meet or exceed the relevant IEC and GB standards, guaranteeing its performance, safety, and reliability for use in demanding industrial applications worldwide.