ARB Spare Sealed Relay - 12V 40A - 180905SP

The ARB Spare Sealed Relay 12V 40A (Part # 180905SP) is a genuine ARB replacement relay designed to keep your ARB electrical accessories running reliably in the field. Whether you rely on ARB air compressors, air lockers, or other 12-volt accessory systems on your 4x4 or off-road vehicle, having a spare sealed relay on hand means a failed relay never has to end your adventure or your work day.

Key Features & Benefits

• ARB Brand Relay: Sourced directly from ARB, so you know this relay is built to the same specifications as the relay that came with your ARB accessory — no guessing about compatibility with your existing ARB system.
• 12V 40A Sealed Design: Rated at 12 volts and 40 amps, this sealed relay is suited to handle the electrical demands of ARB's high-draw 12V accessories. The sealed construction helps protect internal contacts from moisture, dust, and the harsh environments common to overlanding and off-road use.
• Spare / Replacement Part: Keeping a spare relay in your recovery kit or tool bag means you can swap a failed relay and get your ARB equipment back online quickly — critical when you're on a trail, at a remote campsite, or in a work situation where downtime matters.
• Compact and Easy to Store: With dimensions of approximately 2" (W) × 2" (D) × 1" (H), this relay is small enough to tuck into a glove box, tool pouch, or overland spares kit without taking up meaningful space.
• ARB Part Number 180905SP: The specific ARB part number ensures you're ordering the correct replacement component rather than a generic substitute.

Specifications

• Brand: ARB
• Part Number (MPN): 180905SP
• SKU: ARB180905SP
• UPC: 8414904190
• Voltage: 12V
• Amperage: 40A
• Type: Sealed Relay
• Dimensions: 2" W × 2" D × 1" H (as listed)

Fitment

This ARB sealed relay is a spare/replacement component for ARB electrical systems and accessories that utilize a 12V 40A sealed relay — such as ARB air compressors and ARB air locker solenoid systems — rather than a vehicle-specific fitment part. Compatibility is determined by the ARB accessory or system you own, not by your vehicle's year, make, or model. If your ARB accessory uses part number 180905SP or a 12V 40A sealed relay, this is the correct replacement. If you are unsure whether this relay matches your specific ARB product, consult your ARB accessory's owner's manual or contact our team for fitment assistance before ordering.

What's in the Box

• 1 × ARB Spare Sealed Relay, 12V 40A (Part # 180905SP)

Why Buy from ThreePiece.us

ThreePiece.us offers free shipping on every order, so you're not paying extra to get your spare relay to your door. Our team has served 10,000+ customers and is available to help you verify that this relay is the right match for your ARB system before you buy — just reach out and we'll point you in the right direction. Financing is available through Affirm, making it easy to stock up on ARB spares and accessories without paying everything upfront. We stand behind every product we sell with a price match guarantee, and our fitment specialists are a call or email away.

Frequently Asked Questions

Q: What ARB accessories use this relay?
A: The ARB 180905SP is a 12V 40A sealed relay designed as a spare or replacement for ARB electrical accessories that specify this part number. Common ARB products that use sealed relays in this configuration include air compressors and air locker systems. Check your ARB product's documentation for the specific relay part number to confirm this is correct for your application.

Q: Is this relay vehicle-specific, or will it work on any vehicle?
A: This relay is not vehicle-specific — it is a component-level spare for ARB accessories. It is compatible with any 12V vehicle system where the ARB accessory requiring part number 180905SP is installed. The relay itself operates on a standard 12-volt electrical system.

Q: How long will shipping take?
A: This product is listed as a regularly stocked item. ThreePiece.us provides free shipping on every order. Contact our team at the number listed on site if you need a more specific delivery estimate for your location.

Q: Can I finance this purchase through Affirm?
A: Yes — financing through Affirm is available at ThreePiece.us, so you can spread the cost of your ARB parts and accessories over time. Look for the Affirm option at checkout.