LDMINDA 12V 300A Solenoid Relay Nickel-Plated 4-Terminal — Continuous Duty, Built-In Resistor & Diode

LDMINDA’s 12VDC continuous-duty solenoid relay is a nickel-plated, 4-terminal battery isolation switch rated for transient currents up to 300A and designed for winches, golf carts, marine and industrial use.

This heavy-duty solenoid relay combines a rugged electromagnetic coil, built-in resistor and diode protection, and copper contact points to provide reliable on/off switching for 12V systems. The unit is nickel-plated for corrosion resistance and uses a high-temperature 180°C copper-wound coil for consistent operation in demanding environments. It replaces several common part numbers and is supplied as a single 4-terminal assembly with mounting bracket.

How does this solenoid handle heavy current loads?

The relay is engineered for high transient currents (up to 300A) while recommending continuous use below approximately 150A to preserve longevity. For sustained loads, the manufacturer suggests working around 80A with duty-cycle breaks to avoid overheating. The design uses two copper contact points for robust conductivity and lower voltage drop under load.

• Transient surge capacity: 300A maximum
• Recommended continuous current: under 150A
• Typical working guidance: ~80A with duty-cycle breaks
• Dual copper contact points for improved conductivity

What protections and internal components are included?

The relay includes an integrated resistor and diode to help suppress coil spikes and protect adjacent electronics when the coil is de-energized. The coil winding uses high-temperature 180°C copper wire to resist thermal deterioration, while the plated enclosure improves environmental resilience. These elements reduce electrical noise and extend service life when correctly installed.

• Built-in resistor and diode for spike suppression
• 180°C copper coil winding for thermal durability
• Nickel-plated casing for corrosion resistance
• Normally-open (NO) contacts with SPST operation

Where and how can I install this relay?

This four-terminal battery isolation solenoid is intended for mounting on vehicles and equipment such as golf carts, boats, winches, factory machinery and hydraulic units. The straight bracket includes factory-drilled mounting holes sized and spaced for straightforward installation on common frames and panels. Follow vehicle wiring diagrams and secure all battery and load connections with appropriately rated cabling and fasteners.

• Mounting bracket: straight bracket with holes (5/16 x 19/32, 2-13/64" center)
• Terminal layout: 4 terminals for battery, load and coil connections
• Typical uses: marine, winch, golf cart, military and industrial equipment
• Installation note: use correct gauge cables and observe duty-cycle limits

What part numbers and replacements does this fit?

The LDMINDA relay is compatible with a range of common replacement part numbers, making it a suitable swap-in for many existing systems. It ships as one complete 4-terminal assembly with the resistor and diode preinstalled, so no extra components are needed for basic retrofits. Verify terminal layout and mounting spacing against your original part before ordering.

• Replaces: 70-111224, 3635820, 1114208, 1114218, 1114223, 1114534, 1114547
• Package contents: one 12V 4-terminal solenoid relay with resistor and diode
• Contact type: Normally Open (NO), SPST single circuit
• Power rating: coil resistance ~14Ω, coil power ~10.2W

Who is this for? This relay is a practical choice for technicians, fleet maintainers, marine installers and DIYers who need a rugged 12V battery isolation switch for high-current applications. It suits systems that require a compact, nickel-plated solenoid with integrated spike protection and reliable copper contacts — especially where replacement compatibility and environmental durability matter. If you expect prolonged continuous currents above the recommended limits, consider selecting a model specifically rated for extended continuous duty.