Wacker Neuson 5000192503 25A Double Pole Double Throw Relay

The Wacker Neuson 25A Double Pole Double Throw Relay is a genuine OEM component designed for the HI750 and HI900 series mobile indirect fired air heaters. Sourced directly from Wacker Neuson, this relay meets the exact electrical specifications required by these units, covering diesel, natural gas, and dual-fuel configurations across both skid-mounted and mobile setups. Verified fitment spans the full HI750 and HI900 model families, including surge brake and extreme cold weather variants rated to -40°.

Key Features

• Correct Switching Capacity — Rated at 25 amps with a double pole double throw configuration, matching the original circuit design of the HI750 and HI900 heater control systems.
• Genuine OEM Part — Manufactured by Wacker Neuson to the same electrical tolerances and contact ratings as the relay installed at the factory, ensuring the control circuit behaves exactly as engineered.
• Broad HI-Series Fitment — Compatible with HI750G, HI750D, HI750GM, HI750GM HD, HI900D, HI900G, and HI900DGM models, including 3x16, 4x12, surge brake, and -40° surge brake variants.
• Heater Control Integrity — A functioning relay ensures burner ignition sequences, fuel control, and fan switching operate on demand; a failed relay can cause the heater to shut down or fail to start in critical cold-weather conditions.
• Electrical Safety Compliance — Using the correct OEM-rated relay prevents overloading the control circuit, which is especially critical in fuel-system and ignition-control applications on combustion heaters.
• Drop-In Replacement — Part number 5000192503 installs directly into the existing relay socket with no re-wiring or terminal modification, restoring the control board to full operation quickly.

A double pole double throw relay acts as an electrically controlled switch that simultaneously manages two separate circuits, routing power to different outputs depending on whether the relay coil is energized or at rest. In indirect fired air heaters like the HI750 and HI900, this relay plays a central role in the control logic — governing functions such as burner firing, fuel valve activation, and blower sequencing. When the relay fails, the heater may not ignite, may shut down unexpectedly, or may lose control of one or more operating functions, leaving crews without heat in demanding cold-weather environments.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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