Multiquip EM804 Heat Exchanger Circuit Breaker

The Multiquip EM804 is a genuine OEM Heat Exchanger Circuit Breaker designed for a wide range of Multiquip and portfolio-brand equipment, including concrete pumps, mixers, power buggies, rollers, trash pumps, vibrators, and Whiteman mortar mixers. As an authorized OEM component, the EM804 is manufactured to the exact specification required for proper thermal protection across all compatible models. Confirmed fitment includes LS300GK, EM120, EM12M Series, PRO20, MC12PH, MC64P/S, WBH-21EFP, WBH21EPA, WTB-16, WTB-16PD, AR14H, RW1403HF, V305EH, V305EK, MQ600H, MQ600HTB, MQ600HTP, G55H, and WM70S/P. Sourcing the correct OEM circuit breaker by part number EM804 ensures your machine's heat exchanger circuit is protected to the level the manufacturer intended.

Key Features

• Genuine OEM Overcurrent Protection — Manufactured to the exact trip rating and form factor required for heat exchanger circuit protection across all listed Multiquip equipment families.
• Direct-Fit Installation — Engineered as a drop-in replacement that connects to the existing mounting and wiring configuration without alteration, maintaining correct circuit continuity.
• Broad Cross-Equipment Compatibility — A single OEM part number covering concrete pumps (LS300GK, LS300G, LS300P), Essick and MQ mixers (EM120, EM12M, PRO20, MC12PH, MC64P/S), power buggies (WBH-21EFP, WTB-16), rollers (AR14H, V305EH, V305EK), trash pumps (MQ600H series), vibrators (G55H), and Whiteman mixers (WM70S/P).
• Thermal Circuit Integrity — Correctly rated breaker response prevents heat exchanger circuit damage caused by sustained overcurrent conditions, protecting downstream components and extending overall system life.
• Electrical Safety Compliance — A functioning circuit breaker is a critical safety component; replacing a tripped or failed breaker with the correct OEM-rated EM804 restores the designed overcurrent protection level and supports safe machine operation.

A heat exchanger circuit breaker serves as the overcurrent protection device for the electrical circuit that powers or controls the heat exchanger on your equipment. When current in that circuit exceeds the breaker's rated threshold — due to a fault, short, or overload — the breaker trips and interrupts the circuit before wiring or connected components can be damaged. A breaker that fails to trip exposes the heat exchanger circuit to potentially damaging current levels, while one that trips prematurely will shut the system down unnecessarily. Replacing a worn or faulty breaker with the correct OEM-rated Multiquip EM804 restores proper overcurrent protection and keeps the heat exchanger circuit operating within its designed parameters.

For questions about fitment or to confirm the EM804 is the right circuit breaker for your specific machine configuration, contact the DHS Equipment team directly.

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.

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.