Ecer asks for your consent to use your personal data to:
Personalised advertising and content, advertising and content measurement, audience research and services development
Store and/or access information on a device
Your personal data will be processed and information from your device (cookies, unique identifiers, and other device data) may be stored by, accessed by and shared with 135 TCF vendor(s) and 65 ad partner(s), or used specifically by this site or app.
Some vendors may process your personal data on the basis of legitimate interest, which you can object to by do not consent. Contact our platform customer service, you can also withdraw your consent.
Your message must
be between 20-3,000 characters!
Submit Requirement
Thank You！
Your requirement has been sent. we will contact you quickly!
{"title":"CNC Machined C11000 ETP Copper Power Distribution Block with Tin-Plated","imgUrl":"https:\/\/img.chinax.com\/nimg\/e5\/4d\/8eb47b9ee017ae6d8e32dcb23a02-200x200-1\/cnc_machined_c11000_etp_copper_power_distribution_block_with_tin_plated.jpg","attrs":{"Material":"C11000 ETP Copper","Current Rating":"100A - 1200A","Stud Sizes":"M6, M8, M10, M12, M16","Short-Circuit Rating":"Up to 100kA peak (1 second)"}}
{"title":"Precision CNC Machined Aluminum Parts for Industrial Equipment","imgUrl":"https:\/\/img.chinax.com\/nimg\/51\/0c\/9afaf4513ec83c45d971d3e4b982-200x200-1\/precision_cnc_machined_aluminum_parts_for_industrial_equipment.jpg","attrs":{"Brand Name":"OEM ODM","Certification":"ISO 9001,IATF16949,ISO14001,SA8000","Place of Origin":"CHINA","Minimum Order Quantity":"1pcs"}}
{"title":"Precision CNC Machined Stainless Steel Parts for Industrial Use","imgUrl":"https:\/\/img.chinax.com\/nimg\/cc\/f9\/33380791b077aa5c868462f341f5-200x200-1\/precision_cnc_machined_stainless_steel_parts_for_industrial_use.jpg","attrs":{"Place of Origin":"CHINA","Certification":"ISO9001","Minimum Order Quantity":"100pcs","Price":"0.1-3"}}
{"title":"Customized Motorcycle CNC Parts SS Aluminum Copper CNC Machining Mechanical","imgUrl":"https:\/\/img.chinax.com\/nimg\/36\/46\/139cdb572520c9751e168b61a8d0-200x200-1\/customized_motorcycle_cnc_parts_ss_aluminum_copper_cnc_machining_mechanical_parts.jpg","attrs":{"Brand Name":"OEM","Certification":"ISO9001","Place of Origin":"CHINA","Minimum Order Quantity":"100pcs"}}
{"title":"Aluminum 6061 6063 7075 CNC Machining Parts Anodized Custom Mechanical Parts","imgUrl":"https:\/\/img.chinax.com\/nimg\/05\/1e\/9ee3be14b97ce2c886a732f5354f-200x200-1\/aluminum_6061_6063_7075_cnc_machining_parts_anodized_custom_mechanical_parts.jpg","attrs":{"Brand Name":"OEM","Certification":"ISO9001","Place of Origin":"CHINA","Minimum Order Quantity":"100pcs"}}
{"title":"OEM 3 4 5 Axis CNC Mechanical Parts Anodized Plating For Medical Instruments","imgUrl":"https:\/\/img.chinax.com\/nimg\/7c\/8b\/96d9d768eb2350c28c4aaba9ccec-200x200-1\/oem_3_4_5_axis_cnc_mechanical_parts_anodized_plating_for_medical_instruments.jpg","attrs":{"Brand Name":"OEM","Certification":"ISO9001","Place of Origin":"CHINA","Minimum Order Quantity":"100pcs"}}
{"title":"Custom Metal CNC Mechanical Parts Precision CNC Machining Service ISO9001","imgUrl":"https:\/\/img.chinax.com\/nimg\/f0\/35\/a266ac05c78771c5630130006bb0-200x200-1\/custom_metal_cnc_mechanical_parts_precision_cnc_machining_service_iso9001_approved.jpg","attrs":{"Brand Name":"OEM","Certification":"ISO9001\uff0c IATF16949","Place of Origin":"CHINA","Minimum Order Quantity":"100pcs"}}
CNC Machined Copper Power Distribution Block for Electrical Panel and Switchgear
Power distribution blocks don't get much attention until something goes wrong. A loose connection on a distribution block in a 4000A switchboard doesn't just trip a breaker — it arcs, melts copper, and starts a fire in the panel. The block must carry its rated current continuously without overheating and maintain reliable connections under thermal cycling, vibration, and short-circuit forces.
We machine copper power distribution blocks from C11000 ETP copper bar stock on CNC milling centers. These are solid copper blocks with multiple cable connection points (studs or tapped holes), internal current paths between connection points, and mounting features for installation in the panel. A typical block has 1-2 input connections and 4-12 output connections, distributing power from a main feeder to branch circuits.
The current-carrying capacity of a copper block is determined by its cross-sectional area and connection quality. For continuous duty, copper carries about 2-3 Amps per mm² of cross-section (depending on cooling conditions and allowable temperature rise). A block rated for 600A needs a minimum cross-section of 200-300mm² in the current path. We calculate this for every design and include thermal analysis in our DFM review.
Connection points are the critical features. Cable lug connections use studs (M6 to M16 depending on cable size) that are either pressed into the copper block or machined as integral threaded features. Busbar connections use tapped holes or through-holes with bolt clearance. Every connection point generates contact resistance, and every contact resistance point generates heat. The block design needs enough material around each connection to conduct that heat away without creating a hot spot.
Surface finish on the connection faces matters. A rough mating surface has higher contact resistance (more heat) than a smooth one. We machine connection faces to Ra 1.6 or better and apply tin plating (3-5μm) to prevent oxidation, which would increase contact resistance over time.
Key Features
C11000 ETP Copper: 101% IACS conductivity — the standard for electrical power distribution. Virgin copper only, material certificates provided. Copper grade verified by conductivity testing on incoming material.
Thermal Design: Cross-sectional area calculated for rated current with continuous duty temperature rise per IEC 60947. Thermal analysis available for custom block designs. Hot spot identification in the DFM phase, not after field failures.
Tin-Plated Connection Faces: 3-5μm tin plating on all connection surfaces. Prevents copper oxidation, maintains low contact resistance over years of service. Plating thickness verified by XRF. Unplated copper blocks available for short-life or cost-sensitive applications.
Multiple Configuration Options: 1-in/4-out, 1-in/6-out, 1-in/8-out, 2-in/8-out, 2-in/12-out. Stud or tapped hole connections. Vertical or horizontal mounting. Custom configurations designed to specification.
Short-Circuit Withstand: Block geometry designed to withstand electrodynamic forces during short-circuit events (up to 100kA peak for 1 second per IEC 60947). Mounting features sized for both thermal and mechanical loads.
Tin 3-5μm (connection faces), Optional: Silver 2-3μm (high-current)
Current Rating
100A - 1200A (block design dependent)
Stud Sizes
M6, M8, M10, M12, M16 (depending on cable size)
Short-Circuit Rating
Up to 100kA peak (1 second)
Certifications
ISO 9001:2015, RoHS, CE, UL component recognition
Lead Time - Prototype
5-7 days
Lead Time - Production
7-15 days
MOQ
50 pieces
Origin
Dongguan, China
Applications
Industrial Power Distribution: Distribution blocks in motor control centers, power distribution panels, and industrial switchboards. Multiple branch circuits fed from a single main feeder.
Switchgear and Panelboards: Copper distribution blocks in low-voltage switchgear (up to 1000V) and lighting panelboards. Tin-plated for maintenance-free connections.
Data Center Power: Power distribution blocks in data center PDUs (Power Distribution Units). High reliability, low contact resistance, and tin-plated connections for continuous duty.
EV Charging Infrastructure: Distribution blocks in EV charging station power panels. Multiple charging circuits fed from a common DC bus. Copper blocks rated for DC current up to 500A per circuit.
Renewable Energy Systems: Power distribution in solar farm combiner boxes and wind turbine nacelle electrical panels. Corrosion-resistant tin plating for outdoor environments.
Marine Electrical Panels: Tin-plated copper distribution blocks for shipboard power distribution. SS 316 mounting hardware for saltwater corrosion resistance.
Why Choose Sinbo Precision
Electrical Design Knowledge: We don't just machine copper to your drawing. We review current paths, calculate required cross-sections, check connection points for adequate contact area, and flag potential hot spots.
Copper Machining Expertise: Copper is gummy and ductile — it doesn't machine like steel. We use sharp carbide tooling with polished rake faces, positive rake angles, and flood coolant for clean, smooth connection faces with Ra 1.6 finish.
Stud Installation: For blocks with press-in studs, we machine stud holes to the correct interference fit (H7/s6) and press studs in with a hydraulic press. Pull-out force tested on every lot.
Tin Plating Coordination: We manage tin plating through certified plating partners who understand electrical contact requirements. Plating thickness verified by XRF and adhesion tested per ASTM B571.
Thermal Analysis: For custom block designs, we provide thermal analysis showing expected temperature rise at rated current, accounting for connection contact resistance, copper cross-section, and mounting configuration.
UL Component Recognition: We can supply distribution blocks under our UL component recognition, reducing your UL investigation cost for the end product.
Manufacturing Process
DFM Review: Current path analysis. Cross-section calculation for rated current. Connection point design (stud vs. tapped hole). Short-circuit force calculation. Mounting configuration. Plating specification.
Material Preparation: C11000 ETP copper bar stock. Material certificates verified (conductivity, chemical composition). Cut to blank size.
CNC Milling: Roughing to remove bulk material and establish current path geometry. Finishing on connection faces (Ra 1.6). Drilling and tapping connection holes. Press-fit stud holes machined to H7 tolerance.
Stud Installation (if applicable): Copper or brass studs pressed into interference-fit holes with hydraulic press. Pull-out force tested. Stud position verified by CMM.
Deburring: All edges broken. No burrs on connection faces. Vibratory deburring for general surfaces, hand deburring for connection features.
Tin Plating & Inspection: Electrolytic tin plating 3-5μm on connection faces. XRF thickness verification. CMM dimensional inspection on all connection features. Visual inspection for surface defects. Plating adhesion test.
Frequently Asked Questions
Q: Tin or silver plating on the connection faces?
A: Tin for 95% of power distribution applications. It's adequate for current ratings up to 1000A and costs much less than silver. Silver for ultra-high-current blocks (above 1000A) or applications where the absolute minimum contact resistance is needed. Silver's contact resistance is about 30% lower than tin.
Q: How do you size a power distribution block?
A: By the rated current. For copper, the rule of thumb is 2-3 A/mm² of cross-section for continuous duty in free air. For enclosed panels with limited cooling, use 1.5-2 A/mm². A 400A block needs about 150-250mm² of copper in the current path. The DFM review calculates this precisely based on your enclosure conditions.
Q: Can you make a distribution block with both stud and busbar connections?
A: Yes, common configuration. Studs for cable lug connections on one side, flat busbar connection surfaces on the other. The internal copper cross-section connects both sides. We'll design the geometry to maintain adequate current-carrying area throughout.
Q: What's the difference between C11000 and C10200 copper?
A: C11000 ETP (Electrolytic Tough Pitch) has 99.9% copper minimum with 0.02-0.04% oxygen. Conductivity 101% IACS. Standard for electrical applications. C10200 OFHC (Oxygen-Free High Conductivity) has 99.95% copper minimum with virtually no oxygen. Conductivity 101% IACS. Used where hydrogen embrittlement is a concern. For machined distribution blocks, C11000 is standard.
Q: Do you test the temperature rise on completed blocks?
A: On request, yes. We can perform a thermal test by passing rated current through the block and measuring the temperature at connection points and hot spots with thermocouples. Temperature rise per IEC 60947 limits (typically 70K above ambient for copper-to-copper connections). This test is recommended for new custom designs.
Q: What's the lead time for a custom distribution block?
A: 5-7 days for first article in standard C11000 copper. 3-5 days additional for tin plating. For production quantities (100+), 10-15 days from order to shipment. Copper bar stock is usually in stock.
