Part1. Why Double-Deck PCB Terminal Blocks Are a Smart Choice for Modern Wiring
What Are Double-Deck PCB Terminal Blocks?
Double-Deck PCB Terminal Blocks, as the name suggests, integrate two levels of connection points within the same terminal block module. Compared to traditional single-level terminal blocks, they offer double the wiring capacity in the same PCB footprint. This design cleverly utilizes vertical space, enabling high-density wiring.
Core Advantages of Double-Deck PCB Terminal Blocks 
- Significant Space Saving: This is the most prominent advantage of double-deck terminal blocks. In an era where device miniaturization and high integration are paramount, saving valuable PCB real estate is critical. The two-tier design makes it possible to connect more wires in a limited area, thereby reducing the overall size of the equipment.
- Simplified Wiring Design: Although the number of connection points increases, the dual-level structurehelps organize wires more systematically. Wires for different functions or signal types can be distributed on different levels, making the wiring clearer and reducing the likelihood of tangled or crossed wires. This simplifies both wiring design and subsequent maintenance work.
- Potential Cost-Effectiveness: While the cost of an individual double-deck terminal block might be slightly higher than a single-deck one, considering the PCB space saved, the potential reduction in the total number of terminal blocks needed, and simplified assembly processes, double-deck PCB terminal blocks often offer better overall cost-effectiveness. Reducing PCB size itself can lower manufacturing costs.
- Improved Organization and Clarity: By layering connection points, different circuits can be identified and managed more clearly. For example, power and signal lines can be connected to different levels, or inputs and outputs can be separated. This improves efficiency during installation, debugging, and troubleshooting.
Part2. Recommended Manufacturers for Double-Deck PCB Terminal Blocks
1. WAGO
Product Model: 250-710
International Brand, High Brand RecognitionFast Product Updates and IterationsComprehensive Global Support and DocumentationDisadvantages of Ordering from WAGO:
Customers may face long lead times when ordering from WAGO, which can affect project timelines.The price of WAGO products is generally high, reflecting their premium brand status and potentially impacting project budgets.Securing customized products from WAGO often involves high requirements, such as large minimum order quantities and less flexibility than some alternatives.WAGO offers high-quality, technologically advanced products with diverse options. However, balance these benefits against potentially higher prices, longer lead times, and less customization flexibility compared to specialized suppliers, carefully considering your specific project needs.
2. AOSI Electronics
AOSI Electronic’s Double-Deck PCB Terminal Blocks are engineered for modern electronics that demand high wiring density and efficient use of PCB space. These products provide a compact and robust solution for complex circuitry, allowing for an increased number of connections in a minimal footprint, utilizing a two-tierdesign.
Model Number: FS1.5-XX-500-24
Plastic material: PA66 UL94V-0
Pitch： 5.0mm
Certification: UL,CE,ROSH,CQC,TUV
Wire range: Can be 1-30AWG
Temp: -40℃-105℃
Max soldering: 250℃~±10℃/5Sec
Pole: 2-24P
Affordable Price with Comparable Quality: Offers highly competitive pricing for products benchmarked against WAGO’s design and quality standards, delivering significant cost savings.Fast Lead Times & Strong Inventory: Ensures rapid delivery supported by substantial stock levels, with typical lead times for bulk orders within 14 days.Comprehensive Certifications: Holds a full suite of certifications, ensuring products comply with global quality and safety requirements.Guaranteed After-Sales Support: Provides enhanced after-sales service featuring dedicated one-on-one support from experienced engineers.Disadvantages of Ordering from AOSI Electronic:
International Brand Recognition: Possesses lower international brand visibility when compared directly to a long-established global brand like WAGO.Specialized Product Focus: Primarily concentrates on the terminal block sector, meaning its product range has a smaller span across diverse electronic component categories compared to more diversified manufacturers.
Click here to learn more3. Phoenix Contact
Product Model: ZFKKDSA 1,5C-5,0
Extensive Product Line and Continuous Innovation: Offers an industry-leading, vast portfolio of products, encompassing diverse connection technologies and application-specific solutions, backed by ongoing R&D and innovation. Strong Global Presence and Technical Support: Possesses a comprehensive worldwide sales network, production sites, and technical support teams, ensuring convenient service and professional assistance for global customers.Disadvantages/Considerations when Ordering from Phoenix Contact:
Premium Pricing: As a leading high-quality brand, their products are generally positioned at a higher price point, which can increase project procurement costs. Longer Lead Times: For some specific or non-standard products, similar to other large manufacturers, you may experience extended lead times.Choosing Phoenix Contact means opting for reliability and advanced technology. However, companies should also weigh the premium pricing and potentially longer lead times for certain items against their specific project requirements, budget, and timeline.
Part3. How to Choose the Right Specs for Your Wiring Project
A. Electrical Specifications:
- Voltage Rating (V):The maximum continuous voltage the terminal block can safely withstand without insulation breakdown.
- Current Rating (A):The maximum continuous current the terminal block can carry without exceeding its temperature limit.
- Contact Resistance:The electrical resistance at the point of connection between the wire and the terminal block’s conductive parts.
B. Mechanical & Physical Specifications:
- Wire Size and Type: The range of wire gauges (e.g., AWG in North America, mm² internationally) the terminal block is designed to accept. Also, its compatibility with solid, stranded, or fine-stranded conductors (and whether ferrules are recommended or required for stranded/fine-stranded wires).
- Pitch (Center-to-Center Spacing): The distance from the center of one connection point (pole) to the center of the next. Common pitches for PCB terminal blocks include 2.54mm, 3.5mm, 3.81mm, 5.0mm, 5.08mm, 7.5mm, etc.
- Number of Poles/Positions: The number of individual circuits or connection points the terminal block provides. For double-deck terminal blocks, this is per level, effectively doubling density.
C. Environmental & Operational Specifications:
- Operating Temperature Range: The minimum and maximum ambient temperatures at which the terminal block can safely operate.
- Flammability Rating (e.g., UL94 V-0, V-1, V-2): A measure of the plastic housing material’s resistance to ignition and flame spread.
D. Standards and Certifications:
Approvals from recognized bodies (e.g., UL, CSA, VDE, ENEC, CE, RoHS, REACH) indicating that the product meets specific safety, quality, and environmental standards.
Steps to Get a Samples
Step 2: Sample Confirmation
We offer free or low-cost samples for compatibility testing.
- 3D drawings and datasheets provided
- Lead time: 2–5 working days
- WAGO/Phoenix compatible models available
- Flexible trade terms (EXW, FOB, CIF)
- Payment options: T/T, L/C
- Custom branding & packaging available
Step 4: Production & Delivery
Full quality inspection before shipment and DHL / FedEx / Air & Sea freight options.
Step 5: After-Sales & Reordering
We provide full technical support, 24-hour repeat order processing, and long-term engineering collaboration to ensure seamless integration and ongoing success.
Frequently Asked Questions
Here are some common questions many users ask about Double-Deck PCB Terminal Blocks:
What are the main advantages of using double-story PCB terminal blocks? The primary benefits include:
- Significant PCB space savings due to their vertical two-tier design.
- Increased wiring density.
- Simplified and more organized wiring layouts.
- Potential overall cost-effectiveness by reducing PCB size and component count.
What wire sizes are typically compatible with two-level terminal blocks?
Compatibility varies by model and manufacturer. Most two-level terminal blocks, including popular series like the FS1.5-XX-500-24, accommodate a common range of wire gauges, often from 22 AWG up to 16 AWG (approximately 0.5 mm² to 1.5 mm² ), supporting both solid and stranded conductors. Always check the specific product datasheet.
What's the difference between screw and spring-cage double-deck terminal blocks?
- Screw-type double-deck terminal blocks:
- Offer high clamping force.
- Are a traditional choice, familiar to many technicians.
- May require periodic re-tightening in high-vibration environments unless designed with anti-loosening features.
- Spring-cage double-deck terminal blocks:
- Provide fast, tool-less or tool-assisted wiring.
- Offer excellent vibration resistance.
- Maintain consistent connection force without needing re-tightening, ensuring long-term reliability.
Can I get custom multi-level PCB terminal blocks?
Yes, some manufacturers, particularly agile ones like AOSI, offer customization options for multi-level PCB terminal blocks. This can include different colors, marking, number of poles, or even slight modifications to suit specific application needs, often with more flexible MOQs.
Conculsion
Let’s simplify your procurement and find the perfect solution, like the FS1.5-XX-500-24, for your needs.
