12V 500A 4-Pin Solenoid Relay - Car Starter/Dual Battery

12V 500A 4-Pin Solenoid Relay for Car Starter and Dual Battery Systems

High-current 12V DC solenoid relay, designed for automotive applications and electrical systems where heavy loads must be controlled via a separate control circuit. It is suitable for dual-battery systems, starting circuits, auxiliary batteries, RVs, commercial vehicles, marine vessels, and custom 12V installations.

The relay operates in a normally open ( NO) configuration: when the coil is not energized, the power circuit remains open. Applying voltage to the control terminals activates the relay, closing the internal contact and allowing current to flow between the main terminals.

This configuration allows for the control of a high-current circuit using a low-current control signal and is particularly useful when separating the control circuit from the power circuit, for example, to connect an auxiliary battery, control high-draw electrical accessories, or manage starting and power supply circuits.

The relay is equipped with 4 terminals: two threaded main terminals for connecting the power circuit and two smaller terminals for controlling the coil. The robust construction with an integrated metal bracket ensures stable mounting

Key features:

• 12V DC high-current solenoid relay

• Normally open (NO) configuration

• 4 connection terminals

• Maximum switching current: 500A

• Activation time: approx. 25 ms

• Release time: approx. 10 ms

• Operating temperature: -30°C to +80°C

Recommended applications:

• Automotive systems with dual batteries

• Connection and management of auxiliary batteries

• 12V starting circuits

• RV, van, off-road, and commercial vehicles

• 12V marine systems

• High-power electrical accessories

• Custom electrical systems

General connection diagram:

• Terminal 30: positive input from the power circuit / battery

• Terminal 87: output to the device or circuit to be powered

• Terminal 85: negative / coil ground

• Terminal 86: 12V coil control positive

Technical note: The maximum current of 500A must be considered as a maximum switching or peak value, not as a guaranteed continuous operating value. For high-current installations, cables, cable lugs, fuses, protective devices, and ground points must be properly sized based on the system’s actual power consumption.

Warning: The product must be installed by competent personnel or a qualified installer. Incorrect wiring or undersized components can cause overheating, voltage drops, or damage to the electrical system.