YX-G Series Three-Phase EMI Filters: RFQ-Ready Selection Guide for Industrial Panels and Drive Systems

Product blog | TPS ELECTRIC LLC

When a machine, power cabinet, inverter skid, UPS system, or industrial automation platform is already defined enough for supplier review, the EMI filter is no longer a small accessory. It becomes part of the compliance path, panel layout, wiring method, heat and service strategy, and RFQ risk profile. The YX-G series from TPS is designed for three-phase power-line noise suppression in industrial systems where engineering teams need a practical model range, multiple mounting and output options, and project support beyond a catalog part number.

This article is written for system integrators, panel builders, procurement teams, and electrical engineers who are comparing suppliers at the bottom of the funnel. It focuses on the selection questions that usually decide whether a filter can move from shortlist to RFQ: current rating, voltage class, topology, termination style, enclosure fit, compliance expectations, and TPS solution support.

Why the YX-G series belongs on the RFQ shortlist

The YX-G series is a family of three-phase EMI filters for industrial AC input lines. According to the supplied specification, the range covers high-current three-phase configurations, including YX81G electrical schematic options with rated currents from 1 A to 1700 A and three-phase plus neutral YX91G options with rated currents from 1 A to 1200 A. The specification also highlights high attenuation performance up to 300 MHz, multiple case sizes, and output modes such as quick-connect tab, screw, copper bar, terminal block, and wire. For a BoFu buyer, that gives the project team room to match the filter to the real cabinet, not the other way around.

A broad family such as YX-G helps avoid late-stage substitutions because engineers can discuss the electrical schematic, case size, and termination method with TPS before the RFQ is frozen.

What each decision role should evaluate

System integrators need a filter that reduces conducted noise without creating unexpected installation work. The question is not only “does it attenuate noise,” but also “can it be installed repeatably across multiple sites?” Panel builders look at case dimensions, mounting holes, torque access, conductor routing, and separation between line and load wiring. Procurement teams compare supplier responsiveness, documentation, project quantities, and lead-time risk. Electrical engineers verify rated current, voltage class, topology, leakage current constraints, grounding method, and alignment with the applicable EMC plan.

TPS supports these overlapping requirements with filter products, industrial power products, EMC and safety testing, integration solutions, electronic manufacturing services, cabinet-related work, and procurement support.

Product architecture: three-phase and three-phase + neutral options

The YX-G family should be understood as a configurable EMI filtering platform rather than a single fixed part. The supplied pages show two major ordering families: YX81G for three-phase EMI filtering and YX91G for three-phase filters with neutral. The same project may evaluate both formats depending on the load topology, service supply, leakage-current limits, and downstream equipment architecture.

Electrical schematic options: do not treat filters as interchangeable blocks

The supplied specification lists schematic families such as 81, 82, 83, and 84 for the three-phase version and 91, 92, 93, and 94 for the three-phase + neutral version. During RFQ, ask TPS to map the noise source and compliance target to the correct schematic family instead of selecting only by current rating.

If your team is still deciding between line-filter topologies, the TPS article on YX-G terminal-bolt three-phase EMI filters can be used as a deeper companion resource. For single-phase equipment or appliance-style platforms, the related YB-T series EMI filter guide can help define when a three-phase product is unnecessary.

Selection logic for engineers and buyers

Start with current, voltage, and thermal margin

Begin with the continuous current of the three-phase line, then add the project’s expected margin based on duty cycle, ambient temperature, enclosure ventilation, and load profile. High-current filters are often mounted in warm cabinet zones near drives, power modules, or contactors. Even when the nameplate current looks correct, installation conditions can change the thermal result. TPS can review the load profile, cabinet environment, and target current to help identify an appropriate YX-G series model for quote or sampling.

Voltage must be checked against the actual supply. A 400/480 VAC industrial project may involve different nominal voltages, tolerances, and regional documentation expectations. Where the end customer asks for a US industrial panel path, procurement should confirm the model-specific approval status, markings, and supporting documents before issuing the purchase order. Where the machine is part of a drive system, the EMC plan may also reference standards such as IEC 61800-3 for adjustable speed power drive systems and machine tools.

Match attenuation needs with leakage-current limits

The datasheet highlights attenuation performance up to 300 MHz, but the selection should still be tied to the emissions source: VFD, switching power supply, regenerative power module, UPS front end, or contactor-rich automation panel. The target is adequate attenuation while maintaining safe leakage current, protective earth strategy, nuisance-trip control, and manufacturable wiring.

For pre-compliance projects, TPS can review whether the filter, cable routing, grounding, and enclosure construction work together. The TPS resource on US compliance considerations for power systems is useful when EMI filtering is part of a wider power-conversion package.

Choose the termination method before the cabinet layout is frozen

Termination style affects assembly labor, service access, torque inspection, cable bend radius, conductor size, and heat rise. Smaller ratings may use quick-connect tabs or screw terminals, while higher-current cabinets may require copper bar or terminal-block options. TPS can also support surrounding custom cable assemblies and sheet metal enclosure requirements.

Integration and installation considerations

EMI filters are sensitive to physical implementation. A correctly rated filter can underperform if the cabinet layout allows line-side and load-side conductors to couple noise around the filter. Mount the filter close to the incoming line or noise boundary, keep dirty and clean wiring separated, and avoid looping the load-side cable back across the input side. The filter case should be bonded to the protective earth plane or mounting plate with low impedance. Paint, powder coating, anodizing, and loose fasteners can all increase impedance at exactly the point where the filter needs a strong RF ground.

Panel builders should confirm the outline drawing and mounting holes for the selected G case before drilling back panels. The supplied specification includes G case drawings, and each project should verify clearances for finger-safe covers, ferrules or lugs, copper bar access, and torque tools. Where the cabinet is part of a larger automation package, TPS’s guide to industrial control cabinets for automation is a useful companion because the filter is only one element of panel safety, layout, and serviceability.

For US panel builders, component selection should be coordinated with the broader control-panel compliance route. The official UL page for UL 508A describes the industrial control panel standard, while UL 1283 covers electromagnetic interference filters. The practical point for RFQ is simple: ask for the exact model’s approval file, marking information, and applicable conditions of use. Do not assume that every current rating, termination format, or regional label has the same documentation package.

Best-fit applications for YX-G filters

Three-phase motor drives and machine automation

Variable-speed drives are common sources of conducted noise, and they often sit inside dense control cabinets where space and wiring discipline are difficult. A YX-G filter can be specified at the cabinet input or at a defined power boundary to help reduce emissions reaching the facility supply. For machine builders, the key RFQ question is whether the filter is being selected for one cabinet, a repeatable machine series, or a global platform that must support multiple voltage and documentation expectations.

UPS, SMPS, and industrial power systems

UPS systems, industrial switching power supplies, and high-power power-conversion assemblies can require EMI filtering at the line input to protect both the product and the installation environment. TPS can supply power products and related solutions, so procurement teams can discuss the filter together with upstream or downstream power architecture. For example, customers working on high-power AC/DC equipment can also reference TPS guidance on high-power industrial switching power supplies or PFS1500 AC-DC power supply selection when defining a complete BOM.

PV systems, elevators, manipulators, and industrial equipment

The specification lists photovoltaic systems and industrial applications, elevator equipment, three-phase motor drives, industrial automation equipment, manipulator equipment, UPS/SMPS, and power supplies as typical applications. In these environments, EMI filtering is commonly tied to reliability, compliance, and field troubleshooting. A filter that is easy to install, inspect, and replace can reduce project risk for integrators who support multiple sites.

Why source this type of filter through TPS

For many B2B customers, the final decision is not only about the filter. It is about whether the supplier can help the team reach a shippable, supportable, and certifiable system. TPS can provide the YX-G series and comparable EMI filtering solutions, while also supporting related engineering work around power electronics, control cabinets, wiring, manufacturing, and testing. This matters when the RFQ includes drawings, sample builds, compliance concerns, or integration milestones.

TPS’s broader manufacturing stack includes electronic manufacturing services, mixed-technology PCB assembly, magnetics, enclosure work, cables, and integration support. If your project includes a custom power electronics assembly, the article on TPS electronic manufacturing services for power electronics can help procurement understand what can be sourced together. If the filter is part of an engineered power module or custom magnetic assembly, the guide to custom transformers and power inductors may also be relevant.

Procurement and project coordination

Procurement teams should ask TPS for model confirmation, documentation, sample availability, production quantity planning, packaging requirements, and alternatives if the first-choice model is constrained. For repeat builds, discuss approved equivalents or customized connection formats before the final documentation package is locked.

RFQ checklist

To speed up the RFQ process, include the following information in your inquiry. The more complete the first request is, the faster TPS can provide a useful technical and commercial response.

• Supply topology: three-phase or three-phase + neutral, plus protective earth arrangement.
• Nominal voltage, tolerance, frequency, and target market or installation region.
• Continuous current, peak or overload profile, ambient temperature, and enclosure ventilation.
• Noise source: VFD, servo drive, UPS, SMPS, PV inverter, regenerative power system, or mixed cabinet.
• Preferred schematic family if known, or the compliance problem that must be solved.
• Mechanical constraints: available footprint, mounting orientation, case size preference, conductor entry direction, and clearance limits.
• Termination preference: quick-connect tab, screw, copper bar, terminal block, or wire.
• Required documentation: datasheet, drawings, approval files, RoHS/CE/CB/UL-related information where applicable, and any customer-specific forms.
• Quantity, prototype schedule, production forecast, and whether alternatives are acceptable.

For projects involving high-current cabinets, build-to-print panels, or integrated power-electronics assemblies, consider sending TPS the panel drawing as well. Their related guide on build-to-print control panel checkpoints explains why early review prevents rework in production.

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