AOSI Electronics is a trusted manufacturer of screw terminal blocks, offering durable, high-current solutions with secure screw clamp technology. Our terminals ensure stable connections under vibration and heat—perfect for power distribution, control panels, and field wiring.
We support OEM/ODM customization, flexible packaging, and global shipping with fast turnaround.
At AOSI Electronics, all our terminal blocks and connectors are rigorously tested and fully certified:
✅ UL, CE, RoHS, and REACH compliant
✅ 100% quality inspection before shipment
✅ Strict adherence to ISO 9001:2015 quality management standards
✅ Fireproof, high-temperature resistant, and vibration-tested designs for industrial environments
🔒 Reliable connection starts with certified components. We make no compromise when it comes to safety and compliance.
As a direct factory with over 15 years of experience in terminal block production, AOSI provides:
🔧 Over 30 injection molding machines
🧰 In-house tooling and mold design capabilities
👷 50+ skilled workers and 8 production lines
🚚 Monthly output over 5 million pieces
From prototyping to bulk delivery, we offer stable lead times, flexible MOQ, and consistent product quality.
Whether you are a distributor, system integrator, or OEM, AOSI is ready to support your growth:
🌐 Exporting to 40+ countries across Europe, Asia, and the Americas
🧩 Customizable options: pin count, logo, color, housing material, packaging
🤖 Engineering support for special pitch, modular block design, and high-current applications
📦 We speak your language: fast communication, drawings, samples, and global logistics support.
AOSI is a reliable partner for OEM wiring components. Their screw terminals are CE-certified and always arrive on time, which is critical for our project deadlines.
We tested samples from 4 suppliers, and AOSI’s screw terminal blocks were clearly the most robust and easy to install. The clamping force is excellent.
The screw terminals worked great in our solar inverter boxes. AOSI supported us with datasheets, quick quotes, and even custom color coding.
Great quality screw terminal blocks – no wire slippage and very solid build. We’ve used them in our industrial control panels for over a year with zero issues.
For high-current power wiring, screw-type terminal blocks offer low contact resistance and heat-resistant performance. They are a trusted choice in power converters, inverters, and main distribution units.
Used in HVAC control boards and intelligent building systems, screw terminals simplify field wiring while ensuring safe, long-term connectivity under varying temperature and humidity conditions.
Heavy-duty machines rely on secure wiring to prevent downtime. Screw terminal blocks are preferred for their firm connection and ability to handle shock and mechanical stress in complex equipment setups.
In trains and transportation control systems, screw terminal blocks maintain connection integrity despite constant vibration. Their high insulation strength supports safety-critical applications.
A screw terminal block is an electrical connector that joins wires using a tightening screw to create a firm electrical connection.
To wire a screw terminal block correctly, follow these steps:
Yes. We offer branding (logo engraving), custom housing colors, special packaging, and even customized screw types or pitch sizes for high-volume OEM orders. We work closely with your engineering team to match your exact design and regulatory needs.
To select the correct screw terminal block, consider the following:
✅ Current rating & voltage: Match your application’s electrical demands.
✅ Wire size range: Ensure the terminal accepts your wire gauge (e.g., 0.5–35mm²).
✅ Mounting type: PCB-mount, DIN rail–mount, or panel-mount?
✅ Environmental conditions: Exposure to heat, dust, vibration, etc.
✅ Certifications needed: CE, UL, RoHS for compliance.
Still unsure? Contact our engineers with your application scenario—we’ll recommend the best-fit model.
Yes! Here’s how to request samples:
Our screw terminal blocks cover wire ranges from 0.5mm² up to 35mm² (AWG 22–2). This range supports both signal-level wiring and high-current power delivery. Wire size compatibility is clearly marked on each datasheet.
| Feature | Screw Terminal Block | Spring Terminal Block |
| Connection Method | Mechanical screw clamping | Push-in or lever spring clamp |
| Current Capacity | Higher – ideal for power applications | Moderate – ideal for signal/control wiring |
| Wire Size Flexibility | Excellent for large-diameter wires | Limited for thick cables |
| Vibration Resistance | Strong, but may loosen if not torqued | Excellent – self-tensioned contact |
| Installation Speed | Slower – manual screwing required | Faster – tool-free |
Yes, our products meet international standards:
✅ CE – European safety compliance.
✅ RoHS – Restriction of hazardous substances.
✅ UL (optional) – Available for high-volume OEM orders.
📦 All certifications are provided with the shipment or electronically for your records.
For standard items: 7–10 working days
For custom/OEM parts: 2–4 weeks depending on mold and order volume.
We aim to support fast design-to-production timelines.
Looking for durable and CE-certified screw terminal blocks for your industrial wiring needs? AOSI Electronics offers a wide range of high-current screw-type connectors with fast lead times, OEM customization, and global delivery.
Get in touch today to request free samples or a tailored quote for your project.
Looking for other types of terminal blocks? Discover our full range of connection solutions below.
