The Husqvarna 542177920 Key Switch is a genuine OEM ignition control component designed for the PP518 power pack and the FS513, FS520, and FS524 floor saws. As a direct Husqvarna OEM part, this switch is built to the exact electrical specifications required by these machines, ensuring proper start, stop, and safety-shutoff function. Cross-reference part number 542177920 against your parts diagram to confirm fitment before ordering. DHS Equipment supplies this part to help keep your equipment running through its full service life.
Key Features
- OEM Electrical Specification — Manufactured to Husqvarna's exact resistance and contact ratings, so the switch operates the ignition and safety circuits precisely as designed — no guesswork on electrical compatibility.
- Drop-In Replacement — Matches the original mounting profile and wiring connector of the factory switch, allowing straightforward installation without adapters or modifications to the harness.
- Broad Fitment Coverage — Confirmed for the PP518 power pack and FS513, FS520, and FS524 walk-behind floor saws, making this a single part solution across multiple machines in a fleet.
- Reliable Ignition and Shutoff Control — A correctly functioning key switch gives operators positive, repeatable control over machine start and stop — a worn or failed switch can cause hard-starts, failure to shut down, or loss of safety-circuit integrity.
- Safety-Circuit Integrity — On both power packs and floor saws, the key switch is part of the machine's safety shutoff path. Using a genuine OEM replacement preserves the intended safety function without compromising the circuit design.
The key switch is the primary operator interface for starting, running, and shutting down the machine. It completes or interrupts the ignition circuit and, on most construction equipment, also feeds the safety shutoff system — meaning a faulty switch can prevent the machine from starting or, more critically, from stopping when required. Over time, internal contacts wear, corrode, or fail from repeated use and exposure to dust and vibration, leading to intermittent starting, unresponsive shutoff, or complete electrical failure. Replacing a worn switch with a genuine OEM unit restores full, dependable control of the machine's ignition and safety systems.
Part Details
| Part Number | 542177920 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Key Switch |
Compatibility & Fitment
| Name | Model |
|---|---|
| Power Pack | PP518 |
| Floor Saw | FS513 |
| Floor Saw | FS520 |
| Floor Saw | FS524 |
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.
