Premium DIN Rail Terminal Block Filter 2-Stage EMC

The CW4EL2-DG Series is a premium enhanced-grade single phase AC power line EMI filter built in a European-standard DIN rail form factor — featuring a compact engineering plastic enclosure, European-style color-coded terminal blocks, and direct bottom-mount DIN rail engagement for seamless integration into IEC-standard industrial control panels alongside PLCs, drives, relays, and other DIN rail automation components.

The “E” Enhanced grade dual-stage π-type filter circuit delivers superior insertion loss performance across the conducted EMI frequency spectrum. The “L” Low Leakage design controls ground leakage current within limits compatible with RCD-protected distribution systems. Combined with European-style green and grey terminal blocks accepting standard ferrule-terminated conductors, the CW4EL2-DG is the specification-grade EMI filter for demanding European-market and internationally-aligned industrial panel programs.

Rated for 115VAC / 250VAC at 50Hz / 60Hz, available in current ratings from 1A to 60A, and fully CE and RoHS certified.

Specifications

📄 Full datasheet, terminal block wire gauge specifications, insertion loss curves, leakage current data, and dimensional drawings available upon request.

The DG Series — Four Defining Characteristics

European-Standard Form Factor & Aesthetics

The CW4EL2-DG is designed from the ground up to integrate visually and dimensionally with European-origin industrial automation components:

• Light grey engineering plastic enclosure — matches the visual standard of Siemens, ABB, Schneider, Phoenix Contact, and other major European automation brands in mixed-component panel builds
• Label-forward orientation — filter installs with identification label facing the panel door, consistent with European panel documentation and commissioning standards
• Compact width-efficient body — occupies minimal DIN rail length for space-efficient panel layout
• No protruding mounting hardware — clean panel appearance without external clips, brackets, or mounting ears

Bottom Direct DIN Rail Mount — “DG” Designation

The “DG” suffix ( Bottom Rail Clip) designates the unique mounting approach of this series:

The bottom-direct mounting channel is molded into the housing base — the filter simply slides onto the DIN rail from the end or snaps down from above, exactly like a PLC module or circuit breaker, and secures in place.

European Color-Coded Terminal Blocks

• Green Terminal Block (LINE side — Left): The use of green for the LINE input terminal block follows European electrical safety color conventions — immediately identifying the power input connection point to panel wiring technicians familiar with European standards
• Grey Terminal Block (LOAD side — Right): Standard grey terminal blocks on the LOAD side for equipment output connections — consistent with Phoenix Contact, Weidmüller, and Wago terminal block color conventions used throughout European panel builds
• Screw-Clamp Connection: Accepts bare wire, bootlace ferrules (recommended), and pre-insulated ferrules — the standard wiring method for European industrial panel construction
• Tool-Required Connection: Flathead or Pozidriv screwdriver — standard European panel wiring tool

Enhanced + Low Leakage Dual Performance

• “E” Enhanced Grade: Superior insertion loss performance compared to standard-grade filters — deeper attenuation of both common-mode and differential-mode conducted EMI across the interference frequency spectrum
• “L” Low Leakage: Controlled ground leakage current — compatible with RCD-protected distribution circuits and applicable to equipment leakage current budgets under IEC 62368-1 and related standards

Circuit & Internal Component Details

Capacitor Network

• CX (X-Class, Differential-Mode): 3 × 0.1μF Line-to-line X-rated capacitors — differential-mode noise suppression across the conducted EMI spectrum. No contribution to ground leakage current
• CY (Y-Class, Common-Mode): 2 × 3300pF Line-to-earth and neutral-to-earth Y-rated capacitors — common-mode noise suppression with controlled leakage current contribution. CY value selected for optimal balance between common-mode attenuation and low leakage current compliance

Inductor Network

• L: 4 × 0.5mH Enhanced Common-Mode Choke High-permeability toroidal core winding — optimized within the Enhanced “E” circuit topology to achieve higher insertion loss targets. The inductor-dominant suppression approach in the Enhanced design reduces dependence on CY capacitance for common-mode attenuation — directly enabling the low leakage current characteristic without compromising EMI suppression performance

Bleed Resistor

• R: 1MΩ X-capacitor safety discharge resistor — mandatory IEC 60335 / EN 60950 compliance component ensuring safe stored charge dissipation after AC power disconnection

Product Features

Enhanced EMI Performance — “E” Grade

Superior common-mode and differential-mode insertion loss versus standard-grade filters — providing greater EMC compliance margin for demanding applications and high-noise electrical environments

Low Leakage Current — “L” Grade

Controlled ground leakage within limits compatible with:

• RCD / GFCI protected distribution (30mA, 10mA classes)
• Multi-filter installations where cumulative leakage is a design constraint
• Equipment leakage budgets under IEC 62368-1, IEC 60601-1 adjacent, and related standards

European Terminal Block Standard

• Green / Grey color coding — immediate visual compliance with European electrical safety and panel wiring conventions
• Ferrule-compatible screw clamp — accepts bootlace ferrules per DIN 46228 for professional European panel wiring practice
• Finger-safe terminal design — live part protection during wiring and panel servicing
• Clear L / N / E marking — per IEC 60445 conductor identification standard

Bottom DIN Rail Integration

• Flush panel integration — no protruding clips or external hardware
• Label-forward installation — identification visible from panel door
• 35mm EN 60715 TS35 compatible — universal European panel rail standard
• Adjacent component compatible — installs directly beside PLCs, drives, terminals, and circuit breakers without spacing adapters

Extended Current Range: 1A to 60A

The DG series covers the widest current range in the CW4EL2 family — from 1A light-duty instrumentation filtering through to 60A high-power industrial load filtering — within a consistent European panel form factor. A single product family serves the full panel power distribution spectrum.

Dual Voltage: 115VAC / 250VAC

Single variant supports both North American and international power standards — enabling one product line to serve global panel build programs

Why Source From Our Factory

Full In-House Manufacturing

• Circuit design, simulation, and component engineering
• Toroidal inductor winding — in-house production
• Engineering plastic housing injection molding
• European terminal block integration and quality verification
• Complete electrical testing — insertion loss, leakage current, hi-pot

OEM & ODM Capability

• Custom current ratings — 1A to 60A standard; higher on engineering review
• Custom terminal block configurations — alternative European terminal brands or specifications
• Custom housing color — grey standard; alternative colors on volume programs
• Custom label and branding — OEM nameplate, logo, model designation
• Custom insertion loss targets — enhanced circuit tuning for specific EMC requirements
• Custom leakage current limits — tighter specifications for demanding certification requirements
• Alternative certification — UL, TUV, CCC on program request

Quality Control & Testing

Production batch leakage current measurement and insertion loss verification reports available with every shipment.

Installation Notes

⚠️  Mount onto EN 60715 standard 35mm (TS35) DIN rail 
    via bottom channel — slide onto rail end or 
    press down onto rail until engagement clicks.
    Verify secure seating before wiring.

⚠️  Use bootlace ferrules (DIN 46228) on all 
    conductor ends before insertion into terminal 
    blocks — required for professional European 
    panel wiring practice and reliable long-term 
    terminal contact performance.

⚠️  Connect GREEN terminal block (LINE) to AC 
    power source input: L, N, E as marked.
    Connect GREY terminal block (LOAD) to 
    protected equipment output.
    Do not reverse LINE and LOAD connections.

⚠️  Bond E (Earth) terminal to panel chassis ground.
    Without ground connection, both common-mode 
    suppression and low leakage performance 
    are non-functional.

⚠️  In RCD-protected installations, calculate 
    total cumulative leakage from all filters 
    on the protected circuit before commissioning.
    Contact our team for leakage budget 
    calculation support.

⚠️  Tighten all terminal screws to the torque 
    specified for the terminal block model.
    At 40A–60A ratings, under-torqued terminals 
    present a fire and connection failure risk.

⚠️  Use conductor cross-sections rated for the 
    selected current per IEC 60364 or applicable 
    local wiring regulations.