Stud Terminal EMI Filter Single Phase AC Power Filter

If you’re building equipment that needs to stay clean on the power line — whether that’s industrial machinery, medical devices, automation controllers, or power supplies — you already know how much a noisy AC line can mess things up. This is exactly what the CW3-S Series Single-Phase EMI Power Line Filter is designed to handle.

Built for AC 115V/250V systems at 50/60Hz, with current ratings covering 1A through 20A, this filter suppresses both common-mode and differential-mode interference before it reaches your load. The result? Cleaner power, more stable equipment operation, and a much easier path through CE/RoHS compliance testing.

We manufacture these in-house. No middlemen. That means tighter quality control, better pricing on volume orders, and the flexibility to discuss custom configurations when your project needs something a little different.

What the Image Tells You (From the Label)

From the product label on the unit itself:

• Brand: LXLZ® (registered)
• Model shown: CW3-10A-T (same series, stud terminal variant)
• Voltage: 115/250V
• Frequency: 50/60Hz
• Certifications: CE ✔ | RoHS ✔
• Internal circuit components:
  • CX capacitors: 2 × 0.1μF (differential-mode suppression)
  • CY capacitors: 2 × 3300pF (common-mode leakage control)
  • Bleed resistor: 1MΩ (discharge safety)
  • Common-mode choke inductors: 2 × 0.5mH
• Terminals: Stud-type (bolt-on) on both LINE and LOAD sides
• Mounting: Four corner mounting holes — panel or chassis mount

The circuit topology is a classic single-stage LC filter with both CX and CY capacitors plus a common-mode choke. This is a well-proven layout that delivers reliable attenuation across a broad frequency range without over-engineering the BOM.

Key Specifications

Where This Filter Gets Used

B-end buyers sourcing this product typically drop it into:

• Industrial automation panels — servo drives, VFDs, PLCs
• Power supply units (PSU) — switching power supplies for OEM equipment
• Medical equipment enclosures — where leakage current and EMI limits are strict
• CNC machinery and motion control systems
• Audio/AV equipment racks — noise-sensitive signal chain protection
• Telecommunications power infrastructure
• EV charging equipment — AC input filtering stage
• Test & measurement instruments

If your equipment needs to pass EN 55032, EN 55011, FCC Part 15B, or similar EMC standards, installing a properly rated line filter is almost always part of the solution.

Why the Stud Terminal Design Matters

Screw-terminal and quick-connect filters have their place, but stud terminals (bolt-on connections) are a different story when it comes to production reliability:

• ✅ Higher current carrying capacity per connection point — less resistance, less heat at the joint
• ✅ Vibration resistance — critical in industrial and automotive-adjacent applications
• ✅ Lower contact resistance over time — press-fit and spade connectors can loosen; bolted connections don’t
• ✅ Easier field replacement — technicians can swap the unit without special tooling
• ✅ Better suited for high-cycle production wiring — assembly line workers close the connection once and it stays closed

For any application where the filter is inside a panel or enclosure that vibrates, or where the installation needs to last 10+ years without maintenance, stud terminal is the right cal

Manufacturing Advantages — Why Buy Direct From Us

We’re not a trading company reselling someone else’s product. Here’s what that means for you as a procurement buyer:

1. Consistent Component Sourcing We control what goes inside. CX/CY capacitors, the common-mode choke core, and the housing materials are sourced from qualified suppliers we’ve vetted over years of production. You won’t get a batch that suddenly performs differently because someone swapped a cheaper cap.

2. Volume Flexibility Whether you need 500 pieces or 50,000, our production lines can scale without forcing you into a distributor’s minimum order structure. Talk to us about your annual forecast.

3. OEM/ODM Available Need your own brand label? Different terminal configuration? A specific current rating we don’t list? We can discuss it. Many of our long-term clients started with a standard product and moved to a customized version within 6–12 months.

4. CE & RoHS Documentation We provide full compliance documentation with every order — test reports, declarations of conformity, and component-level RoHS certificates if your compliance team needs them for product registration in Europe or other regulated markets.

5. Competitive Lead Times Standard models from the CW3-S series are kept in production stock. We’re not building to order on a 12-week lead time. Contact us to confirm current availability.

Best Practices — Getting the Most From This Filter

From production experience and customer feedback across multiple industries:

Match the current rating with real load current, not just nameplate rating. A filter running near its maximum current rating will run warmer and may have slightly higher insertion loss degradation over time. If your load peaks at 15A, consider the 20A model even if average draw is lower.

Mount the filter as close to the power entry point as possible. The whole point is to stop noise from getting in (or out). Mounting it 30cm away from the inlet with an unshielded wire run between them gives conducted interference a path to bypass your filter entirely.

Ground the chassis properly before trusting the CY capacitors to work. CY capacitors shunt common-mode noise to ground. If your chassis ground is floating or poorly bonded, those capacitors aren’t doing their job.

Don’t run LINE and LOAD wiring in the same cable bundle. This is one of the most common mistakes. If filtered and unfiltered wiring share the same conduit, you’re coupling noise back across the filter through mutual inductance.

Check leakage current against your end-market requirements. The 3300pF CY caps produce a defined leakage current to ground. For medical applications (IEC 60601), verify this falls within allowable limits for your device class — or request a low-leakage variant.

FAQ

Ready to discuss quantities, custom specs, or certification documents? Send us an inquiry and we’ll get back to you within one business day.