Graco 15D557 12VDC Coil Control Relay

Graco 15D557 12 VDC Coil Control Relay — Detailed Description

The Graco 15D557 is a genuine OEM control relay featuring a 12 V‑DC coil. It is used in Graco control boxes to manage power circuits safely and reliably, acting as a switch for control signals in electric sprayer systems.

Key Features & Benefits

• 12 V DC coil designed for low-voltage control systems.
• 3-pole double-throw (3PDT) configuration for flexible switching of multiple circuits. 
• Robust electro-mechanical design ensures long life in demanding environments.
• OEM-grade quality for perfect compatibility with Graco control modules. 
• Compact form factor—easy to integrate into control panels. 

Compatibility & Application

The 15D557 relay is commonly used in Graco 6‑zone control panel assemblies to switch power to various circuit segments or motors. It is specified in Graco control‑box spare‑parts lists, providing critical control switching in professional sprayer systems.

Technical Specifications

Installation & Maintenance

1. Turn off all power before accessing the control panel.
2. Remove the panel cover to locate the existing relay.
3. Disconnect the wires attached to the old relay, noting their positions.
4. Mount the new 15D557 relay securely in the provided socket or mounting bracket.
5. Reconnect the wiring to the same terminals, ensuring tight and clean contacts.
6. Restore power and test the relay operation under normal control commands.
7. Periodically inspect the relay during maintenance for signs of wear, corrosion, or overheating.

Why Use or Replace With the 15D557?

• Restoring correct relay function helps ensure reliable control switching in your Graco system.
• An OEM relay prevents issues from non‑spec relays (e.g., improper voltage, poor contact quality).
• Replacing a worn or damaged relay reduces the risk of control failures, especially in mission-critical spraying tasks.

Frequently Asked Questions