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CNC Machined Copper C10200 Terminal Block for BESS Power Distribution
Product Overview
The terminal block serves as the central connection point in BESS cabinets, where DC strings from cell modules and power cables to inverters converge. As the most electrically stressed component in the system, proper contact resistance is critical to prevent thermal issues during commissioning.
C10200 OFHC (Oxygen-Free High Conductivity) copper provides superior performance compared to C11000, offering enhanced conductivity margins essential for handling 600A+ per connection. The oxygen-free structure ensures reliable performance at elevated temperatures where terminal blocks typically operate.
Our machining expertise addresses the challenges of deep tapped holes, flat contact surfaces, and tight positional tolerances in 2-5kg copper blocks. Through optimized tooling strategies, specific rake angles, chip breaker geometries, and peck cycles, we achieve exceptional tap life of 300+ holes per tap in copper alloys.
Key Features
High Conductivity: C10200 OFHC copper with ≥101% IACS conductivity — verified with certification on every material lot
Deep Thread Quality: M6-M16 tapped holes with thread depth up to 3x diameter, chip-free and gauge-tested
Contact Surface: Ra 0.8 finish on all current-carrying surfaces for minimum contact resistance
Plating Options: Tin plating (standard for BESS), silver plating (high-current), or nickel barrier + tin (harsh environment)
Hardware Integration: Installation of set screws, spring washers, and cable lug hardware per your BOM — delivered ready to bolt in
Current Rating: Designed to handle 200-800A+ per connection point depending on cross-section and plating
Technical Specifications
Specification
Details
Product Name
CNC Machined Copper C10200 Terminal Block for BESS
Material Options
C10200 OFHC, C11000 ETP, C11000 + tin plating
Tolerance
+/-0.01mm (contact surfaces), 6H thread tolerance
Surface Treatment
Tin plating (5-10μm), silver plating (3-5μm), nickel+tin duplex
Thread Options
M6, M8, M10, M12, M16 — standard and fine pitch
Certifications
ISO 9001:2015, IATF 16949, RoHS, CE, REACH
Lead Time - Prototype
3-7 days
Lead Time - Production
7-15 days (100-1000 pcs), 15-25 days (1000+ pcs)
MOQ
1 piece (prototype), 100+ (production)
Origin
Dongguan, China
Applications
BESS Power Distribution: Central terminal blocks for DC string connections in battery energy storage cabinets
Inverter DC Terminals: Heavy-duty terminal blocks for DC-side inverter connections in solar+storage systems
EV Charging Infrastructure: Terminal blocks in DC fast charging power distribution units
Industrial UPS: High-current terminal blocks for three-phase UPS systems in data centers and factories
Solar Combiner Boxes: Terminal blocks for combining and distributing DC strings from solar arrays
Telecom Power Systems: Terminal blocks for 48V DC power distribution in telecom shelters
Why Choose Sinbo Precision
Copper Machining Expertise: Specialized processes for copper alloys including tooling, fixturing, and chip evacuation
Thread Quality Guarantee: Every tapped hole is gauge-tested to prevent cross-threading in high-current circuits
Plating Thickness Verification: XRF testing on every plating lot ensures specified thickness requirements
Hardware Assembly Capability: Complete installation of hardware with proper bagging and tagging per part numbers
Scalable Production: Consistent quality from first article to 10,000+ monthly production with ongoing engineering support
Manufacturing Process
Design Review: Comprehensive analysis of thread depth, material thickness, contact surface accessibility, and plating compatibility
Material Procurement: C10200 OFHC copper from certified mills with conductivity test reports and MTR for every lot
CNC Machining: Multi-side milling with custom fixtures and rigid tapping using MQL for clean threads
Thread Gauging: 100% GO/NO-GO gauge testing on every tapped hole with serial number traceability
Plating: Tin, silver, or duplex plating per specification with XRF thickness verification and lot tracking
Hardware Assembly & Packaging: Installation of set screws, washers, and customer components with anti-tarnish packaging and desiccant
Frequently Asked Questions
Why would I choose C10200 over C11000 for a terminal block?
C10200 is oxygen-free, providing slightly better conductivity at elevated temperatures. For terminal blocks operating at 60-80°C under load, this performance margin justifies the 15-20% material premium. For low-current applications, C11000 remains suitable.
Can you machine terminal blocks with cable entry from multiple sides?
Yes. We regularly machine blocks with tapped holes on top, side entry for cable lugs, and mounting holes on the base. Multi-side machining in a single setup maintains tight positional accuracy.
What's the maximum number of connection points per block?
We've machined blocks with up to 12 connection points. Beyond this, multiple blocks with busbar links are recommended for easier maintenance and to limit potential damage from connection issues.
Do you provide torque specifications for the terminal hardware?
We can recommend torque values based on thread size and plating type, but final specifications should come from your electrical engineer who understands cable lug and conductor requirements.
How do you handle tin whisker concerns in tin-plated copper?
For BESS applications, we recommend a nickel underplate (1-2μm) beneath the tin topcoat. This nickel barrier prevents copper-tin intermetallic growth and significantly reduces whisker formation risk.
Can you provide sub-assemblies with current sensors mounted?
Yes, if you supply the sensor and define the mounting interface. We'll assemble, test the mechanical fit, and ship as a complete unit.
