The Wacker Neuson Thermal Switch is a genuine OEM component designed for the PS4-7503HH and PS4-7503HF series 100mm/4-inch submersible pumps. As a direct factory replacement, this switch seats correctly in the motor housing and reconnects to the existing wiring harness without any alteration to the pump assembly. It is compatible across multiple voltage configurations of the PS4-7503 series, including 400V/50Hz and 440V/60Hz variants in both High Head and High Output configurations. Sourcing the correct OEM part ensures the thermal protection circuit operates exactly as Wacker Neuson engineered it — keeping your submersible pump protected during demanding dewatering operations.
Key Features
- Calibrated Trip Threshold: — Manufactured to the OEM temperature rating, ensuring the switch opens at the correct thermal threshold to protect the motor windings — not too early, not too late.
- Direct-Connect Replacement: — Designed to seat into the existing motor housing cavity and connect directly to the factory wiring harness on PS4-7503HH and PS4-7503HF pumps.
- Broad PS4-7503 Series Coverage: — Fits High Head and High Output configurations across 400V/50Hz and 440V/60Hz voltage variants of the PS4-7503 pump family.
- Motor Protection Restored: — A failed thermal switch leaves the pump motor unprotected against overheating, risking winding burnout and pump failure; this genuine replacement restores that critical safeguard.
- Electrical Safety Compliance: — Genuine OEM specification ensures the switch meets the original electrical ratings for the pump's protection circuit — critical for safe operation in high-voltage 400V and 440V pump configurations.
A thermal switch is a safety device built into the submersible pump motor that monitors internal temperature during operation. When the motor runs too hot — due to a blocked impeller, dry running, or overloading — the thermal switch opens the circuit, cutting power before the motor windings can be damaged. Once the motor cools to a safe temperature, the switch resets and allows normal operation to resume. A faulty or worn thermal switch can either fail to trip when needed, leaving the motor exposed to heat damage, or fail to reset, taking the pump offline unnecessarily.
Part Details
| Part Number | 5000150581 |
|---|---|
| Old Part Number | 0150581 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Thermal Switch |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| PS4-7503HH | PS47503HH | 5000008856, 5000009148, 5000008855, 5000008858, 5000008859, 5000008860, 5000009204 |
| PS4-7503HF | PS47503HF | 5000008862, 5000008863, 5000008866, 5000009151, 5000008861, 5000008864, 5000008865, 5000009206 |
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.
