The Bomag 05711121 Marginal Relay is a genuine OEM electrical component designed for the BW 172 D-2 single drum roller. As a direct-source Bomag part, this relay matches the original specification for voltage, switching load, and terminal configuration — ensuring the electrical circuit it governs operates exactly as engineered. This relay is the correct replacement for BW 172 D-2 machines and installs without modification to the existing wiring harness or mounting position.
Key Features
- Genuine OEM Electrical Spec — sourced directly from Bomag, this relay matches the original switching capacity, coil resistance, and terminal layout required for the BW 172 D-2 circuit it controls
- Direct-Fit Replacement — engineered to the same terminal configuration and mounting format as the original, allowing straightforward installation into the existing relay position
- Confirmed Fitment — verified for the Bomag BW 172 D-2 single drum roller; cross-reference part number 05711121 before ordering to confirm compatibility with your machine
- Restored Circuit Control — a faulty marginal relay can cause erratic or failed operation of the system it switches; replacing it with this genuine part restores consistent, predictable electrical response
- Electrical Safety Assurance — using a correctly rated OEM relay prevents undersized or mismatched components from overloading the circuit, protecting downstream electrical components from damage
A marginal relay is an electrical switching device that controls the activation of a secondary circuit based on signals from the machine's control system. In compaction equipment like the BW 172 D-2 single drum roller, relays of this type manage the on/off switching of auxiliary or operational systems, allowing low-current control signals to safely operate higher-current loads. When a relay fails — whether through contact wear, coil burnout, or corrosion — the circuit it governs may become unresponsive, intermittent, or permanently open, disrupting machine operation until the faulty component is replaced.
Part Details
| Part Number | 05711121 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Marginal Relay |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Single Drum Roller | BW 172 D-2 | 00810074 |
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.
