LXLZ Note: This Product Provides Solutions for Parameter Customization And Application.
3-Stage EMI Filter 110V High Performance AC Filter
If you’re building equipment that needs to pass EMC compliance or simply can’t afford noise interference on your power line — this is the filter your engineers have been asking for. The CW4L3-RC-01 is a single-phase, 3-stage EMI filter designed for demanding industrial and commercial applications where power line noise is a real problem, not just a checkbox.
Built with European-style screw terminal blocks on both input and output sides, installation is straightforward — no soldering, no proprietary connectors. It works across a broad current range (1A to 50A) and handles both 50Hz and 60Hz systems, making it a practical choice whether you’re shipping product into North America, Europe, or Japan.
From the unit pictured, you can see the stainless steel enclosure, clearly marked L/N input and L’/N’ output terminals, CE and RoHS markings — this isn’t a bare-bones commodity filter. It’s production-ready hardware.
Table of Contents
Key Specifications
| Parameter | Value |
|---|---|
| Filter Type | Single-Phase, 3-Stage EMI Filter |
| Model Series | CW4L3-RC-01 |
| Rated Voltage | 0 – 110V AC |
| Current Range | 1A – 50A (selectable by model) |
| Frequency | 50 / 60 Hz |
| Operating Temperature | -25°C to +85°C |
| Connection Type | European Screw Terminal Block (both sides) |
| Enclosure | Stainless Steel, panel-mount |
| Certifications | CE, RoHS |
What Makes This a 3-Stage Design — And Why It Matters
Most budget EMI filters on the market are single or dual-stage. They handle the obvious stuff. But if your equipment operates near VFDs, switching power supplies, servo drives, or other high-frequency noise sources, a single-stage filter often just isn’t enough.
A 3-stage design gives you three independent filtering networks in series:
- Stage 1 — Handles high-energy, lower-frequency conducted interference (typically from the grid or heavy inductive loads nearby)
- Stage 2 — Targets mid-band differential and common-mode noise
- Stage 3 — Cleans up residual high-frequency switching noise before it reaches your sensitive circuitry
The result is significantly deeper attenuation across a wider frequency range — which translates directly to easier EMC compliance testing and fewer headaches during product certification.
Best Practice Note: In our experience working with OEM customers in the medical equipment and industrial automation sectors, replacing a single-stage filter with a 3-stage unit like this one has resolved conducted emission failures at test labs without any other circuit changes. If you’re failing EN 55032 or FCC Part 15B conducted emissions testing, this is often the first upgrade worth trying.
Application Scenarios
This filter is a solid fit for engineers and procurement teams sourcing components for:
- Industrial automation panels — PLC cabinets, servo drive systems, motor control panels
- Medical equipment — Diagnostic devices, lab instruments, imaging equipment power conditioning
- Telecommunications equipment — Power supply filtering for rack-mounted comms hardware
- Test & measurement instruments — Where clean power directly affects measurement accuracy
- Power supply manufacturers — Used as an input filter stage in SMPS designs
- Audio/broadcast equipment — Noise-sensitive professional AV applications
- EV charging infrastructure — Onboard and off-board charger noise suppression
- Semiconductor fab equipment — Precision machinery requiring ultra-clean power lines
Why the European Terminal Block Design Is a Practical Choice
A lot of through-hole or flying-lead EMI filters require custom PCB layouts or fixed wire routing. The Euro-style screw terminal block design on this unit changes that:
- Tool-free wire insertion (depending on terminal type) or simple flathead screw connection
- Works with standard 0.5mm² to 6mm² wire gauges depending on current rating selected
- Easy replacement in the field without desoldering or cutting wires
- Suitable for DIN rail enclosure integration and panel-mount installations
- Both input (L, N) and output (L’, N’) are clearly silk-screen labeled — reduces wiring errors during assembly line installation
For procurement managers: this terminal style is familiar to your engineering teams in Europe and Asia, reducing training overhead and installation errors at scale.
Manufacturing Advantages — Why Source From Us
We’re the manufacturer, not a trading company. That means:
- No middleman markup — your unit cost stays competitive at volume
- Current rating flexibility — we produce this series from 1A through 50A; you select what fits your BOM, we stock or produce accordingly
- Custom labeling and packaging — OEM brand printing on the enclosure label is available for qualified order volumes
- Consistent production quality — stainless steel enclosures are precision-formed in-house; terminal blocks sourced from qualified suppliers with batch traceability
- Certifications ready — CE and RoHS documentation available for your compliance files; we can support your own product certification process with test reports
- Short lead times on repeat orders — once your spec is locked in, reorder cycles are fast
We work with procurement teams directly. If you need samples for engineering validation before committing to volume, that’s a normal part of our process — just ask.
FAQs
Can we get this filter in current ratings other than 20A?
Our application needs 10A and 30A variants.
Absolutely. The CW4L3-RC-01 series covers 1A to 50A. When you contact us, just specify the current rating you need — we’ll confirm availability and lead time. Mixed-rating orders for the same series are common and we handle them in a single shipment.
Do these carry CE certification?
We need documentation for our product compliance file.Yes. CE and RoHS certifications are standard on this series. We can provide the Declaration of Conformity and test reports as part of your sample or first order package. If your certification body needs additional technical documentation, we’ll work with you on that.
What’s the MOQ, and do you offer samples before we commit to volume?
We understand that engineering teams need to validate performance before purchasing at volume. Sample orders are available — contact us with your technical requirements and we’ll discuss the best way to get evaluation units to your team. MOQ for production orders depends on the current rating and configuration; our sales team can give you exact figures.
What’s the actual insertion loss / attenuation performance of this filter?
We’re trying to pass conducted emissions testing.This is the right question to ask. We can provide attenuation curves and insertion loss data for the specific model and current rating you’re evaluating. The 3-stage design gives strong attenuation performance across the 150kHz–30MHz conducted emissions range, which is where most EN 55032 / CISPR 22 failures show up. Share your test setup details and we can advise on the best model for your situation.
Can you do OEM labeling?
We sell equipment under our own brand and need the filter to carry our branding.Yes, for qualified volumes we offer custom label printing on the enclosure. Some customers also request plain (no-label) enclosures. Tell us your volume and branding requirements and we’ll confirm what’s possible and the lead time impact.
Ready to discuss your application or request a sample? Contact our technical sales team with your current rating, quantity, and application details.