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A contactor terminal block is a critical component that appears simple but requires precise manufacturing to ensure reliable performance. These copper terminals carry significant current and must maintain low contact resistance through thousands of make-break cycles.
We machine contactor terminal blocks from C11000 ETP copper and C10200 OFHC copper, maintaining terminal contact surface flatness to 0.02mm and bolt hole position to ±0.01mm for even contact pressure. Standard tin plating (5-10 micron) provides oxidation protection, with nickel underplating available for harsh environments and silver plating for maximum conductivity.
Key Features
C11000 / C10200 Copper: 101% IACS (C11000) or 101.5% IACS (C10200 OFHC) conductivity for minimal voltage drop
Contact Surface Flatness: 0.02mm across terminal mating surface ensures even contact pressure
Bolt Hole Precision: ±0.01mm positional accuracy for consistent alignment
Tin Plating Standard: 5-10 micron plating prevents oxidation and maintains stable contact resistance
Multi-Terminal Configurations: 1-pole through 8-pole blocks with custom spacing and mounting features
Copper Machining Optimized: Specialized chip breaker tooling and coolant strategies developed over 20+ years
Flatness Verification: Every production batch measured with precision straightedge and feeler gauge
Plating Thickness Guaranteed: Tin plating 5-10 micron verified with X-ray fluorescence thickness testing
Contact Resistance Testing: Milliohm-level testing across bolted terminal joints available on request
Modular Design Support: Custom multi-pole terminal blocks with interlocking features
Fast Prototype to Production: 3-7 days for copper machined prototypes, 7-15 days for production with plating
Frequently Asked Questions
What is your minimum order quantity?
1 piece for contactor development prototypes. Production MOQ is typically 100 pieces with volume pricing at 500+.
Can you achieve specific current ratings?
Yes. We verify copper cross-section against your target current rating and allowable temperature rise per IEC 60947 standards.
What copper grade should I use?
C11000 ETP is standard and sufficient for most contactor applications at 101% IACS. C10200 OFHC (101.5% IACS) is worth the premium for high-current applications.
Do you provide tin plating?
Yes. Tin plating 5-10 micron is standard for contactor terminals. Thickness verified with XRF testing, documentation included.
What is the typical lead time?
Prototype: 3-7 days. Small batch: 7-15 days. Mass production: 15-25 days depending on terminal block complexity and plating.
Can you test contact resistance?
Yes. Milliohm-level contact resistance testing across bolted terminal joints, with certified test reports for safety certification submissions.
