Demag GE 26089284 — Brake Rectifier, 110V–500V AC Input

Demag (Terex) · Crane & Hoist Spare Part · Bridge Rectifier · In Stock

The Demag GE 26089284 is a factory-specification bridge rectifier built to release the spring-applied, DC-excited holding brakes on Demag crane and hoist motors. It accepts a wide 110V–500V AC supply — the same range you find across Demag’s KBK light crane systems, DC-Pro chain hoists and DC-Winch drives — and produces the smoothed DC excitation that releases the conical-rotor brake when the contactor closes. The unit is intended to be installed inside the motor terminal box or inside the crane control panel, in line with Demag’s original wiring practice.

KOEED stocks the GE 26089284 alongside the broader Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic and KEYENCE spare-parts catalog, and we routinely quote against full hoist or crane BOMs that mix the Demag rectifier with third-party contactors, overload relays and limit switches.

Send a one-line RFQ to Moritta@KOEED.COM and we will reply with availability and a written quote within 24 hours on business days.

Key Technical Specifications

The values below reflect the GE 26089284 in its standard Demag configuration. Always cross-check the rating plate on the rectifier against the brake coil fitted to the hoist motor before commissioning — Demag issued several variants of this part number across the DC-Pro and KBK generations, and the input voltage window is the easiest way to confirm you have the right one.

Application Scenarios — Where It Fits

The GE 26089284 is a service-replacement rectifier for Demag’s conical-rotor brake motors. The 110V–500V AC input window makes it usable across most industrial mains voltages you will see in a working plant, and the most common deployment scenarios are:

• EOT (electric overhead travelling) cranes — bridge travel, trolley travel and main hoist motors on Demag-built cranes, where the rectifier lives inside the motor terminal box next to the brake coil.
• Demag DC-Pro chain hoists — the current-generation workhorse in Demag’s hoist catalog, where the rectifier is part of the brake-release circuit and is fed from the up/down contactor.
• Demag DC-Winch — for stage, winch and motion-control applications, where smooth, predictable brake release is critical.
• KBK light crane systems — modular aluminum crane systems used in assembly cells, often combined with Siemens or Allen-Bradley control gear at the panel level.
• Conveyor and monorail electrification — where a Demag drive motor with a DC brake is being refurbished and the original rectifier is end-of-life.
• Refurbished-crane export — shipping a used Demag hoist to a site with a different mains voltage (e.g. 110V in legacy plant, 480V in North American sites) is exactly the use case the wide input range was designed for.

If you are spec’ing the GE 26089284 into a greenfield line alongside a new PLC (for example a Mitsubishi MELSEC or Omron SYSMAC controller), the rectifier drops into the existing Demag wiring without needing changes to the safety contactors or the brake coil itself.

Integration & Wiring Notes

The GE 26089284 is a passive rectifier: AC in, smoothed DC out, no control inputs. Wiring follows the standard Demag brake-release topology, and the same topology you will see on most conical-rotor brake motors from other European hoist OEMs. Key points to keep in mind:

• Feed from the contactor: the rectifier AC input is wired in parallel with the motor, downstream of the up/down (or forward/reverse) contactor. When the contactor closes, the rectifier is energized and the brake releases.
• DC output to the brake coil: the two DC terminals go to the brake coil inside the motor. Do not add an external DC contactor between the rectifier and the coil — the rectifier is sized for direct connection.
• No PE on the DC side: the DC output is isolated from the chassis, so chassis-ground the rectifier body to the motor or panel earth bar.
• Common supply voltages: 230V, 380V, 400V, 415V and 480V AC are all inside the 110–500V window, so the same GE 26089284 part covers most EU and North American crane sites.
• Parallel with limit switches / overloads: the brake-release circuit is independent of the PLC-driven safety chain. An Schneider or Yaskawa overload relay upstream of the contactor will not affect the rectifier.
• Modernization with VFDs: if the hoist is being driven by a Yaskawa or Panasonic inverter, the rectifier still feeds the brake coil from the input side of the VFD — never from the VFD output. The brake must release on mains voltage, not on inverter PWM.

For PLC-driven brake-control sequencing (e.g. release-before-run, prove-brake-open feedback), the rectifier’s DC output is the field source and a KEYENCE or Fanuc discrete input module is typically used to read the auxiliary contact on the brake.

Installation & Commissioning Tips

Most failures that trace back to a “rectifier” on a Demag hoist are actually wiring or coil issues, not the bridge itself. The following sequence catches the usual suspects in roughly fifteen minutes per hoist.

1. Isolate and lock out the crane at the main disconnect. Confirm zero voltage on the contactor line side with a known-good meter.
2. Inspect the terminal box: the GE 26089284 lives in a small finned housing. Look for heat discoloration, cracked solder joints and any sign of water ingress from a failed cable gland.
3. Confirm the brake coil rating against the rectifier DC output. A coil with the wrong voltage rating is the most common cause of brake failures that get misdiagnosed as rectifier failures.
4. Measure the AC input with the contactor manually closed (use the maintenance bypass or a service plug). You should see mains voltage at the rectifier AC terminals; if you see less than 90% of nominal, the contactor or wiring upstream is the real problem.
5. Measure the DC output across the brake coil terminals with the contactor closed. The reading should track the rectifier’s rated DC output; if it is zero with AC present, the rectifier is open.
6. Listen and look: the brake should release crisply within ~100 ms of the contactor closing. Sluggish release, humming, or a chattering brake point to a weak DC output — replace the rectifier.
7. Re-torque the terminal screws to Demag’s spec, re-fit the terminal box lid with its gasket, and only then restore power.

If you are quoting the GE 26089284 as part of a wider hoist refurbishment, send the full motor nameplate data and the crane’s mains voltage to Moritta@KOEED.COM and we will cross-check the rectifier against the brake coil and the contactor rating before quoting.

Procurement, Warranty & Lead Time

KOEED supplies the Demag GE 26089284 as a B2B RFQ item, not as a fixed-cart purchase. This keeps the price fair on small one-off hoist repairs and competitive on multi-hoist fleet refurbishment orders.

• Quotation turnaround: written quote with availability and lead time within 24 hours on business days, sent back to the address you reply from.
• Lead time: in-stock units typically ship within 2–3 business days of PO; backorders and large fleet quantities are quoted with a project-specific lead time.
• Warranty: standard 12-month limited warranty against manufacturing defect, with the rectifier inspected and bench-tested before dispatch.
• Worldwide shipping: DHL / FedEx / UPS for small parcels, sea or air freight for crane-fleet orders. We ship to North America, Europe, the Middle East, Southeast Asia and South America.
• BOM quotation welcome: send the full crane or hoist BOM (motors, contactors, overloads, limit switches, rectifiers) and we will quote the lot in a single PDF.
• Obsolete / EOL parts: if the GE 26089284 has been superseded on a particular Demag model, we will flag the modern Demag equivalent in the same quote.

For one-part urgency, email the part number to Moritta@KOEED.COM and we will come back with the fastest available path. For multi-line BOMs, use the structured Create a Quote form on the KOEED site, or send the spreadsheet directly to Moritta@KOEED.COM — one inbox, one quote, one shipment.

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