The Husqvarna 542166121 Relay is a genuine OEM electrical component designed for the FS3500G, FS4800D, FS8400D, and FS3500E floor saws. As a direct factory replacement, this relay matches the original specification, ensuring the electrical switching circuit operates exactly as Husqvarna intended. DHS Equipment supplies this part to help keep your equipment running through demanding concrete cutting applications.
Key Features
- OEM Electrical Specification — manufactured to Husqvarna's exact switching and load ratings, so circuit behavior matches the original relay without variation.
- Direct Drop-In Replacement — engineered to the same connector profile and mounting footprint as the factory-installed relay, allowing straightforward installation.
- Broad Floor Saw Fitment — confirmed compatibility with the FS3500G, FS4800D, FS8400D, and FS3500E floor saws; cross-reference 542166121 against your parts diagram before ordering.
- Restored Electrical Control — a functioning relay ensures proper activation and deactivation of motor or accessory circuits, keeping saw operation consistent and predictable during cuts.
- Electrical Safety Compliance — using the correct OEM relay maintains designed circuit protection characteristics, reducing the risk of overload or unintended energization of downstream components.
A relay is an electrically operated switch that allows a low-current control signal to open or close a higher-current circuit within the machine. On Husqvarna floor saws, relays manage critical switching functions — such as motor engagement or safety interlocks — that must respond reliably every time the operator initiates a command. When a relay fails, the affected circuit may not energize at all, may remain permanently energized, or may switch erratically, all of which can prevent the saw from starting, cause unexpected shutdowns, or disable a safety function. Replacing a faulty relay with the correct OEM part restores predictable, specification-correct switching behavior across the electrical system.
Part Details
| Part Number | 542166121 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Relay |
Compatibility & Fitment
| Name | Model |
|---|---|
| Floor Saw | FS3500G |
| Floor Saw | FS4800D |
| Floor Saw | FS8400D |
| Floor Saw | FS3500E |
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.
