LXLZ Note: This Product Provides Solutions for Parameter Customization And Application.
Bolt Terminal VFD Filter High Current Inverter Reactor
If you’re running VFDs (Variable Frequency Drives) in heavy industrial environments, you already know the headache — harmonics feeding back into your power line, nearby equipment acting up, and sometimes even the drive itself tripping on noise it created. That’s exactly what this filter is built to solve.
The LZ920-S Series is a dedicated three-phase EMI filter engineered specifically for VFD input and output sides. It handles up to 200A rated current across a 250/440VAC, 50/60Hz system, with bolt-type terminals that give you the kind of solid, vibration-resistant connections that panel builders and machine integrators actually need in real installations.
Table of Contents
From the image, the unit shows:
- Robust stainless steel / galvanized enclosure — clearly built for industrial cabinet mounting
- Copper bolt terminals (L1, L2, L3 in / L1′, L2′, L3′ out) — large-gauge, no-compromise connection points
- CE & RoHS certified (visible on label)
- Operating temperature: -25°C to +85°C
- Compact flat-mount form factor with mounting ears on both sides — easy DIN rail panel or backplate installation
Key Features & Why They Matter
Dedicated VFD Input/Output Design
This isn’t a general-purpose line filter. It’s tuned for the specific harmonic profile that inverters generate — switching frequencies, dV/dt spikes, and the common-mode noise that travels through motor cables. Using a generic filter here is a false economy. This one is built for the job.
High-Current Bolt Terminal Interface (0–200A)
Screw-cage or plug-in terminals don’t cut it at this current range. The bolt-type copper terminals let you terminate heavy-gauge cable or busbar connections reliably. Less contact resistance, less heat, longer service life — and they stay tight under vibration.
Dual Voltage Rating: 250V & 440V
Compatible with both single-phase 250VAC and three-phase 440VAC systems. One SKU covers a wide range of industrial voltage standards, which simplifies procurement across different markets or machine variants.
Full EMI / RFI Suppression
Suppresses both conducted EMI and high-frequency harmonic interference generated by IGBT switching. Protects upstream grid equipment and downstream sensitive controls. Critical for CE compliance in exported machines.
Wide Temperature Range: -25°C to +85°C
Whether it’s sitting in a foundry control cabinet or an outdoor telecom shelter, it won’t derate or fail from ambient heat. This range covers virtually every industrial use case.
CE & RoHS Compliant
Pre-certified, which means your machine-level CE documentation process gets simpler. Buyers shipping into Europe or requiring environmental compliance paperwork will appreciate this out of the box.
Typical Applications
- CNC machine tool control panels — protecting servo drives and spindle inverters
- HVAC systems — large fan/pump motor VFD installations
- Industrial automation lines — conveyor, compressor, and press drive systems
- Elevator & crane drive systems — where EMI interference directly affects safety relay logic
- Power generation & energy storage — inverter-coupled systems requiring clean grid interface
- Marine & offshore equipment panels — where both vibration resistance and EMC compliance are non-negotiable
Specifications at a Glance
| Parameter | Value |
|---|---|
| Model | LZ920-S Series (e.g., LZ920-100A-S) |
| Rated Current | 0 – 200A (multiple ratings available) |
| Voltage | 250VAC / 440VAC |
| Phase | 3-Phase |
| Frequency | 50 / 60 Hz |
| Operating Temp | -25°C to +85°C |
| Terminal Type | Bolt (copper stud terminals) |
| Certification | CE, RoHS |
| Application | VFD Input & Output (both sides) |
| Enclosure | Metal, panel-mount with ears |
Best Practices from the Field
These are things experienced panel builders have learned the hard way — we’re putting them here so your team doesn’t have to.
- Install on both input AND output sides when motor cable runs exceed 10 meters. Long cables act as antennas — the output filter prevents radiation from the cable and protects the motor insulation from dV/dt stress.
- Keep filter-to-VFD wiring as short as possible. Ideally under 300mm. Every extra centimeter of unfiltered wire between the filter and the drive is a gap where noise re-enters.
- Bond the filter housing to cabinet earth directly — not through a long wire, but through a proper low-impedance metal-to-metal contact. The bolt mount ears are designed exactly for this.
- Match current rating with margin. For a 75kW / 440V system drawing ~130A, don’t pick the 100A unit — go to the 160A or 200A rating. Running near thermal limits shortens life and increases dropout risk.
- Separate input/output filter wiring physically inside the cabinet. Routing them in parallel bundles defeats the filtering entirely through capacitive coupling.
FAQ
Can this filter be used on both the input and output side of the VFD?
Yes. The LZ920-S is rated and tested for both positions. Many competing products are rated input-side only. For full EMC compliance on exported machines, you often need both sides covered — this filter handles that.
What’s the current rating range available, and how do I select the right one?
The series covers 0–200A. We recommend selecting a rating at least 1.25× your actual load current for thermal headroom. Contact us with your VFD power rating and voltage, and we’ll confirm the right model — we do this selection check for all OEM customers at no charge.
Do you provide CE test reports or EMC documentation we can use for our machine certification?
Yes. CE and RoHS certificates are available. For customers who need component-level EMC test data (e.g., for notified body submissions), we can provide test reports upon request. We understand this is a real pain point for machine exporters.
What are your MOQ and lead time for bulk orders?
MOQ is flexible depending on the model and current rating — we work with panel builders, OEMs, and distributors. Standard models typically ship from stock or within 7–15 business days for production runs. Custom current ratings or enclosure variants: 3–4 weeks. Send us your annual forecast and we can discuss blanket order pricing.
Can you do custom ratings, terminal configurations, or OEM labeling?
Yes — this is actually where we work best. As a manufacturer, we support custom current ratings beyond 200A, alternative terminal formats, modified mounting configurations, and private label / OEM branding. No middlemen, no markups for customization requests. Talk to us directly.
Ready to discuss your project requirements? Send us your VFD specs and installation environment — we’ll recommend the right model and get you pricing fast.