Wacker Neuson 5100011859 Relay

The Wacker Neuson Relay is a genuine OEM relay designed for the RD18, RD24, RD27, RD28, RD40, and RD45 series tandem rollers. As a factory-sourced component, it meets the exact electrical specifications required by the original circuit design, ensuring consistent switching performance across the full range of compatible machines. This part covers an extensive spread of RD series models — including standard, C, O, DPF, SE, and US variants — making it the correct choice for most Wacker Neuson tandem roller fleets. Confirm your machine's model number against the fitment list before ordering to ensure an accurate match.

Key Features

• Correct Switching Specs — Genuine OEM construction ensures the relay operates at the precise voltage and current ratings required by the RD series electrical system, preventing misfires or premature circuit faults.
• Direct Plug-In Replacement — Designed to seat into the original relay socket without modification, maintaining the integrity of the machine's wiring harness and connector terminals.
• Broad RD Series Coverage — Fits RD18, RD24, RD27, RD28, RD40, and RD45 tandem rollers across standard, C, O, DPF, SE, and US configurations — one part number serving a wide fleet.
• Protects Downstream Electrical Components — A properly functioning relay isolates high-current circuits from control signals, shielding sensitive electronics from overload damage and keeping compaction cycles consistent.
• Electrical Safety Compliance — Sourced directly from Wacker Neuson, this relay meets the design tolerances required for safe switching in the machine's control and power circuits, reducing the risk of unintended circuit energization.

A relay is an electrically operated switch that allows a low-power control signal — such as one from an operator switch or controller — to open or close a high-current circuit safely. In a tandem roller, relays manage critical functions including engine starting circuits, vibration system activation, and auxiliary power routing. When a relay fails, the circuit it controls may stop responding entirely or behave erratically, leading to loss of vibration, starting issues, or intermittent electrical faults that are difficult to diagnose until the relay is replaced.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.