Multiquip EM517186 Emergency Switch Contact Blocks

The Multiquip EM517186 Emergency Switch Contact Blocks are a genuine OEM component designed for Mayco and Multiquip hydraulic concrete pump models including the LS300, LS400, LS500, LS600, LS600P, LS300P, LS300G, LS300GK, C30HDG, and C30HDGA. As a factory-sourced part, the EM517186 matches the original electrical specifications and physical configuration of the emergency stop switch assembly — ensuring a correct, dependable replacement when the original blocks wear or fail. These contact blocks are a critical safety component in the pump's control system and should always be replaced with a genuine OEM part to maintain correct circuit function.

Key Features

• Genuine OEM Electrical Spec Match — Factory-sourced contact blocks engineered to deliver the correct contact resistance and switching capacity for the emergency stop circuit on Multiquip and Mayco concrete pumps.
• Direct-Swap Installation — Designed to mount directly to the existing emergency switch body, with matching contact geometry and connection points for a straightforward swap with no circuit modifications.
• Broad Concrete Pump Fitment — Confirmed for LS300, LS400, LS500, LS600, LS600P, LS300P, LS300G, LS300GK, C30HDG, and C30HDGA hydraulic concrete pump models.
• Keeps Emergency Stop Circuits Responsive — Worn or pitted contact blocks can cause sluggish or failed emergency shutdowns; fresh OEM contacts restore the fast, reliable response the switch was designed to deliver.
• Safety-Critical Component — The emergency stop switch is a primary operator safety device on concrete pump equipment; using genuine OEM contact blocks ensures the switch meets the original design intent for electrical safety and control system integrity.

The emergency switch contact blocks are the internal electrical elements inside the emergency stop switch that physically make and break the circuit when the operator activates the E-stop. When the switch is pressed, the contact blocks open the control circuit, cutting power or signal to the pump's operating functions and bringing the machine to a safe stop. Over time, repeated switching cycles cause the contact surfaces to pit, oxidize, or wear down, which can result in intermittent circuit connections, a slow emergency response, or a complete failure of the stop function. Replacing worn contact blocks with the correct OEM parts restores the switch's full electrical performance and ensures the emergency stop system functions as designed when it matters most.

For fitment questions or help confirming this part is correct for your machine, contact the DHS Equipment parts 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.