DC 12V/24V 100A–200A 4-Pin Normally Open Car Relay | WM686

ZOHMYIY WM686 Heavy-Duty Automotive Relay – Reliable Split Charge & Battery Switch

The ZOHMYIY WM686 Automotive Relay is a compact, high-current 4-pin normally open relay designed for 12V and 24V DC systems. Available in 100A, 120A, and 200A ratings, it's the ideal solution for car starter circuits, battery ON/OFF switching, split charge systems, and general automotive or industrial electrical control applications. Made in Mainland China.

Why Choose the WM686 Relay?

• High-Conductivity Pure Copper Coil: Internal pure copper windings deliver strong conductivity and an impressively low energy loss rate for efficient operation.
• Silver Oxide Steel Contacts: Engineered for long service life, these contacts resist arcing and oxidation even under heavy load switching.
• Durable Nylon Shell + Brass Inner Core: The robust nylon housing is heat-resistant and corrosion-resistant, protecting the relay in demanding under-hood environments.
• Plug & Play Installation: Simple 4-pin normally open design makes wiring straightforward — no specialist tools required.
• Versatile Voltage & Current Options: Choose DC 12V or 24V, and select 100A, 120A, or 200A to match your specific application requirements.
• Wide Application Range: Suitable for automotive, RV, marine, household appliances, and mechanical automation systems.

Technical Specifications

What's in the Box?

• 1 × WM686 Automotive Relay

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Safety & Standards Reference

For guidance on electrical safety in automotive and industrial wiring, visit OSHA Electrical Safety Standards.

Frequently Asked Questions

Q: What is the difference between a 100A, 120A, and 200A relay rating?

A: The amperage rating indicates the maximum continuous current the relay contacts can safely carry. A 100A relay suits standard car starter and split charge applications, while the 120A and 200A variants are suited for heavier loads such as winches, high-power lighting, or industrial automation equipment. Always select a relay rated at or above your circuit's maximum current draw.

Q: Can this relay be used for both 12V and 24V systems?

A: Yes — the WM686 relay is available in both 12V DC and 24V DC coil voltage options. Please select the correct voltage variant to match your vehicle or system's electrical supply when ordering.

Q: What does "normally open" (NO) mean for this relay?

A: A normally open relay means the main circuit (load circuit) is open/disconnected by default when no coil voltage is applied. When the coil receives the rated voltage signal, the contacts close and allow current to flow to the load. This is the standard configuration for automotive starter relays and battery isolator/split charge circuits.

Q: Is this relay suitable for a split charge (dual battery) system?

A: Absolutely. The WM686's high current rating and normally open 4-pin design make it well-suited for dual battery split charge setups in vehicles, campervans, RVs, and marine applications. It allows the secondary battery to charge from the alternator while keeping both batteries isolated when the engine is off.