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Ziehl-Abegg RH40C Alternative — LONGWELL LWBE3G400

Looking for an alternative for Ziehl-Abegg RH40C-4DK? The LONGWELL LWBE3G400 is the same-size alternative — same control protocol, mounting dimensions on the LONGWELL drawing, performance characterized using AMCA 210/211 test methods (test report on request) — at 40–55% lower landed cost with 15–30 day delivery vs 12–18 weeks ex-works Ziehl-Abegg. Widely deployed across Medium AHU, BESS container, semiconductor FFU.

Replaces: Ziehl-Abegg RH40C-4DK Diameter: Ø400 mm Family: RH series → LONGWELL LWBE3G / LWAE3G / LWHV Sample: 1–3 days
Replacing
Ziehl-Abegg
RH40C
RH series · EC backward-curved centrifugal plug fan · Ø400 mm
→
With
LONGWELL
LWBE3G400
Same size class (Ø400 mm) — mounting per drawing · Same control · 15–30 day delivery

Specification Comparison

Specification Ziehl-Abegg RH40C LONGWELL LWBE3G400
Fan type EC backward-curved centrifugal plug fan EC backward-curved centrifugal plug fan
Impeller diameter Ø400 mm Ø400 mm 13 models
Airflow range 1,000–5,500 m³/h up to 9,682 m³/h
Static pressure (max) 1400 Pa up to 1,627 Pa
Motor power (max) 1,500 W up to 2,060 W
Noise floor (Lw) 70 dB(A) from 62 dB(A) (nameplate, per model)
Voltage 380–480 V 3Φ 220–230 V 1Φ · 380–400 V 3Φ
Control input 0–10 V / PWM / Modbus / EC-Control 0–10 V / PWM / Modbus RTU (RS485)
IP rating IP54 / IP55 IP54 std · IP55 / IP67 option
Certifications CE · UL · VDE · EAC CE · RoHS · REACH · ETL on single-phase 115/230 V versions (UL 507 / CSA C22.2 No.113)
Sample lead time 4–10 weeks 1–3 days
Series lead time (≤500 units) 12–18 weeks 15–30 days
Landed cost index (LONGWELL = 100) 175–200 100 (baseline)
Verify it on the LONGWELL selector: all 13 LWBE3G400 models — data, measured curves, drawings · LWBE3G400-188NT-17 (largest airflow in the series) · check your own duty point · samples, MOQ and lead time

Why Engineers Switch from RH40C to LWBE3G400

4–8× Faster Delivery

15–30 days
vs 12–18 weeks ex-works for Ziehl-Abegg in 2026. Sample units 1–3 days from stock vs 4–10 weeks.

40–55% Lower Landed Cost

−€600 to −€2,400
per unit at equivalent spec, depending on size and quantity. On a 50-unit FanGrid retrofit, typical CapEx delta is €30k–€120k.

Drop-in Candidate · Same Size Class

Ø400 mm
Same impeller size and control protocol; confirm the mounting hole pattern and inlet ring against the LONGWELL drawing before ordering.

Drop-in compatibility: what matches and what to confirm

Mechanical match

The LONGWELL LWBE3G400 matches the Ziehl-Abegg RH40C mounting pattern (M-mount, ISO 9001 plenum-fan footprint) per the mounting dimensions on the LONGWELL drawing. Inlet ring diameter, motor shaft height, and electrical termination box position are identical. In most retrofits no plate modification is needed — confirm the mounting dimensions against the LONGWELL drawing before ordering.

Electrical & control match

The LWBE3G400 accepts the same 0–10 V analog speed reference, PWM (1 kHz), and Modbus RTU (RS485) control signals as Ziehl-Abegg RH40C. LONGWELL supplies its Modbus RTU register map with the fan so the BMS points can be re-mapped; the register addresses are not identical to the Ziehl-Abegg map.For ebm-papst-specific bus protocols (EC-Control), ask LONGWELL engineering for the integration options.

Performance match

The measured P-Q curve of every LONGWELL model is on its model page; we check your duty point against it before quoting.

Typical Applications

The LWBE3G400 is widely deployed across Medium AHU, BESS container, semiconductor FFU. Common application categories include:

  • Medium AHU
  • BESS
  • FFU

Particularly suited for medium commercial AHU and BESS C&I cabinet thermal.

FAQ

Is LONGWELL LWBE3G400 a true drop-in replacement for Ziehl-Abegg RH40C?
Same size class and control interface. Confirm the mounting hole pattern, inlet ring diameter and shaft height against the dimensioned drawing on the LONGWELL LWBE3G400 model page before ordering; it accepts the same 0–10 V analog / PWM / Modbus RTU control signals and is offered in the voltages listed in the table above.
How does LWBE3G400 compare on efficiency to RH40C?
LONGWELL does not publish a single peak-efficiency figure for the LWBE3G400. The model page on the selection site gives airflow, static pressure and input power along the curve (measured where marked, nameplate-estimated otherwise), so the efficiency at your duty point follows directly; a test report for a specific model is available from engineering on request.
What’s the 2026 lead time difference?
As of May 2026: Ziehl-Abegg RH40C requires 12–18 weeks ex-works due to ongoing allocation. LONGWELL LWBE3G400 ships in 15–30 days for orders up to 500 units and 6–10 weeks for 1,000+ unit OEM programs. Sample units ship in 1–3 days from stocked Ø400 mm inventory.
What’s the cost delta?
At equivalent specification (same Ø, same airflow/Pa, same IP, same control), LONGWELL LWBE3G400 typically lands at 40–55% below Ziehl-Abegg RH40C ex-works pricing. Final pricing depends on quantity, voltage, IP rating, and control protocol options.
What applications is LWBE3G400 typically used for?
LWBE3G400 is widely deployed across Medium AHU, BESS container, semiconductor FFU. Particularly suited for medium commercial AHU and BESS C&I cabinet thermal.

Replace your RH40C — samples in 1–3 days

Send a quick request — model + quantity + delivery address. Sample unit ships in 1–3 days for field validation. Series production at 15–30 day lead time after PO.

Request Sample View Full Cross-Reference Table
Official Product Page
Browse the full Backward-Curved Centrifugal EC Fans range on longwellfans.com — request a quote on LWBE3G400 directly.
View on longwellfans.com →
Ziehl-Abegg® is a registered trademark of Ziehl-Abegg GmbH. This page is published by LONGWELL, an independent manufacturer and is not affiliated with, endorsed by, or sponsored by Ziehl-Abegg. All performance data sourced from publicly available datasheets. All performance figures reflect specific test conditions; final selection should be confirmed by duty point, voltage/control, mounting and project validation.