The Wacker Neuson 5100021611 Key Switch Complete is a genuine OEM component designed for the APT4, APT6, and APT8 series submersible pump lineup, including skid-mounted, electric brake, surge brake, and cold weather configurations. As a direct OEM replacement, this switch is sourced from Wacker Neuson and built to the same specifications as the original — so you get a part that installs and functions exactly as the factory intended. Fitment covers a wide range of APT series variants including APT4S, APT4T, APT6S, APT6T, APT8S, and APT8T models, across both standard and cold weather versions.
Key Features
- Genuine OEM Switching Integrity — Matched to the original electrical contact rating and actuator profile, ensuring the ignition circuit opens and closes cleanly without arcing or resistance drift.
- Drop-In Electrical Fit — Connects directly to the existing wiring harness on APT series pumps with no splicing or terminal modification required.
- Broad APT Series Coverage — A single part number covers APT4, APT6, and APT8 models in skid, electric brake, surge brake, and cold weather variants — standard and CW configurations included.
- Restored Start/Stop Control — A failed key switch can prevent the pump from starting entirely or leave it unable to shut down safely; this replacement restores full operator control of the machine's power circuit.
- Electrical Safety Compliance — As a primary power-control component, using a genuine OEM switch ensures the circuit protection behavior matches the pump's designed electrical load tolerances.
The key switch on an APT series pump is the primary operator interface for controlling power to the machine's electrical system. When the switch is turned, it completes or breaks the ignition circuit, allowing the pump motor to start or shut down on command. A worn or failed key switch can cause intermittent starting failures, an inability to power down the unit safely, or complete loss of machine control — making prompt replacement critical to both operational continuity and on-site safety.
Part Details
| Part Number | 5100021611 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Key Switch Complete |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6T Pump, Electric Brake, Cold Weather | APT6T CW | 5200019795, 5200019794 |
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT6T Pump, Electric Brake | APT6T | 5200019647, 5200019646 |
| APT8S Pump w/Skid, Cold Weather | APT8S CW | 5200019800 |
| APT8T Pump, Electric Brake | APT8T | 5200019649, 5200019648 |
| APT8T Pump, Surge Brake, Cold Weather | APT8T CW | 5200019796, 5200019797 |
| APT4T Pump, Electric Brake | APT4T | 5200019644, 5200019643 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
| APT6S Pump w/Skid, Cold Weather | APT6S CW | 5200019799 |
| APT8S Pump w/Skid | APT8S | 5200018987 |
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.
