The Wacker Neuson Thermal Overload Relay, 1 Phase is a genuine OEM component designed for the HI1000 and HI1000DGM Indirect Air Heater series, including Diesel, Gas, Electric Break, and Surge Brake configurations. As a direct Wacker Neuson OEM part, the is manufactured to the exact specification of the original, ensuring correct calibration and a drop-in fit with no guesswork. This relay is confirmed to fit multiple HI1000 and HI1000DGM variants, making it the go-to replacement for fleet operators and service technicians working across this heater lineup. When your overload protection circuit needs restoring, sourcing the correct OEM part keeps the heater running safely and to spec.
Key Features
- OEM-Calibrated Trip Threshold — Manufactured to the exact current-sensing specification of the original relay, ensuring the overload circuit trips at the correct amperage for this single-phase heater application.
- Direct Drop-In Replacement — Matches the original terminal configuration and mounting footprint, so the 5200020400 installs directly into the existing relay position without adaptation.
- Broad HI1000 Series Coverage — Fits multiple HI1000 and HI1000DGM Indirect Air Heater variants, including Diesel w/Tank, Diesel, Gas, Electric Break, and Surge Brake models.
- Protects Motor and Heating Components — A correctly functioning thermal overload relay prevents motor burnout by cutting power during sustained overcurrent conditions — a failed or out-of-spec relay leaves the heater's drive components unprotected.
- Electrical Safety Compliance — As a safety-critical protection device in a fuel-burning heater, using the correct OEM-spec relay ensures the overload circuit performs as designed under real operating loads.
A thermal overload relay monitors the current flowing through a single-phase motor circuit and automatically interrupts power if that current exceeds a safe level for a sustained period, protecting the motor and downstream electrical components from heat damage. In an indirect air heater like the HI1000 series, this relay is a key safeguard — it acts as the circuit's first line of defense against conditions that could otherwise cause winding failure or electrical fire. When the relay wears out, drifts out of calibration, or fails entirely, the motor loses its overcurrent protection, and the heater may either shut down unexpectedly or, more dangerously, continue running without adequate protection.
Part Details
| Part Number | 5200020400 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Thermal Overload Relay, 1 Phase |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI1000 Indirect Air Heater, Diesel w/Tank | HI1000 | 5200011232, 5200011233, 5200011231, 5100049274, 5100049273 |
| HI1000 Indirect Air Heater, DGM, Electric Break | HI1000DGM | 5200011234, 5200011235, 5100049275, 5100049276 |
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.
