Bel Power LWN2660-6 | 2.5kW Rack Power Supply Specs

Description

Product Introduction

Melcher shelves are still humming in huts that predate the smartphone, and their rectifiers drop out on a schedule nobody tracks. The LWN2660-6 — now branded Bel Power — is the higher-power member of that cassette family, feeding 48V DC distribution where a failed module means dropped sites. Put the full model string on the PO; the LWN line has enough lookalikes to sink a delivery.

Against the LWN1902-6, this cassette pushes roughly 2.5kW from the same rack slot, which is why older plants use it to add capacity without new shelf space. Efficiency sits around 91% at nominal load per Bel’s curve — real figures move with input voltage and ambient, so check the datasheet at your operating point (verify the label rating, too; variants exist).

Key Technical Specifications

Compatible Replacement Models

• ✅ Drop-in Replacement: Same LWN2660-6 model — cassette swap, no rewiring. Set output trim to match plant float voltage before energizing.
• ⚠️ Software Compatible: LWN1902-6 and other LWN-series cassettes — same shelf form factor, but power rating, output trim, and alarm pinout may differ. Reconfigure and verify controller handshake. Budget 1–2 hours with a DC power tech.
• ❌ Hardware Incompatible: Flatpack and Cassette-series rectifiers with different shelf depth or connector pinouts — new shelf required. Don’t force a fit.

Frequently Asked Questions

Can I hot-swap this rectifier?
Only if the shelf is rated for live insertion and the plant runs N+1. Melcher-era shelves vary — check the cassette connector spec. When in doubt, isolate the shelf first.

How do I verify the unit works before it ships?
Request the test record: AC input sweep, full-load burn-in beyond 24 hours, output ripple measurement, alarm signaling check, insulation resistance above 10MΩ. QC Passed tag and proper foam or anti-static packing.

Is the LWN2660-6 the same as a Melcher-branded unit?
Electrically, same family. Bel Power absorbed the Melcher line and carried the model string forward; branding on the label depends on production date. Ask for a label photo before buying.

What float voltage should I set?
Match your battery manufacturer’s data — typically 53.5V for 48V telecom strings. A wrong trim setting ages batteries quietly, and you won’t notice until capacity tests fail a year later.

Will the alarm signaling match my rack controller?
Usually within the LWN family, but cross-generation swaps can shift signal pinout. Compare the wiring diagram against your controller manual before energizing.

What warranty is reasonable?
A tested-functional guarantee with a defined window: 30 days standard, 90 on some refurbished lots. Rough fan noise or trim drift on arrival? Flag it before installation.

Any installation traps?
Two. Airflow direction matters — front-to-back cassettes in a side-exhaust cabinet trigger thermal shutdown. And leave headroom on DC distribution; running at 100% rated load shortens capacitor life noticeably.