OEX ACX1940RB Mini Relay 12V Normally Open 40A - Resistor Protected - Pack of 20
OEX ACX1940RB Mini Relay 12V Normally Open 40A - Resistor Protected - Pack of 20
OEX ACX1940RB Mini Relay 12V Normally Open 40A - Resistor Protected - Pack of 20
OEX ACX1940RB Mini Relay 12V Normally Open 40A - Resistor Protected - Pack of 20
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OEX ACX1940RB Mini Relay 12V Normally Open 40A - Resistor Protected - Pack of 20

SKU: ACX1940RB
Regular price
$277
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Standard Shipping

  • Frankies offers a $15.95 flat rate for Australia-wide shipping, no matter how many items you order. Some larger or heavier items may incur an additional fee, which will be communicated to you when your order is processed.
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Estimated delivery times:

  • WA, NT, and TAS: currently experiencing longer shipping times
  • Holiday periods (e.g. Christmas): deliveries may be delayed due to increased freight volumes

Express Shipping

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Product features

Sealed Mini Relays for 12V Automotive Switching Applications

Product Overview

The OEX ACX1940RB is a 12V, 40A normally open mini relay with resistor spike protection, supplied in a bulk pack of 20. The five-blade terminal configuration is the standard mini relay footprint used across a wide range of automotive relay sockets and harnesses, making it a direct-fit replacement and workshop staple for switching accessories, lighting, fans, and other 12V loads.

Silver tin oxide contact material delivers reliable switching performance and long contact life. The sealed IP67 housing protects against moisture and dust in under-bonnet and exposed mounting positions. A removable mounting tab allows flexible installation options.

Also available as a single unit in a blister pack as ACX1940RBL.

Features & Benefits

  • 40A rating — suited to lighting, fans, compressors, and other mid to high current 12V accessories
  • Normally open contact — circuit is open at rest and closes when the relay is energised
  • Resistor spike protection — suppresses voltage spikes generated when the relay coil is de-energised, protecting sensitive electronics
  • IP67 sealed housing — fully protected against dust and temporary water immersion
  • 5 blade terminals — standard mini relay footprint compatible with common relay sockets
  • Silver tin oxide contacts — reliable switching with excellent contact life
  • Removable mounting tab — flexible installation options for panel and bracket mounting
  • Pack of 20 — bulk trade quantity for workshop stock
  • Also available as single unit — ACX1940RBL

Technical Specs

Specification Detail
Part Number ACX1940RB
Brand OEX
Type Mini Relay
Voltage 12V
Amp Rating 40A
Relay Action Normally Open
Terminals 5 Blade
Spike Protection Resistor
Contact Material Silver Tin Oxide
IP Rating IP67
Mounting Removable Tab
Pack Quantity 20
Warranty 1 Year

Compatible With

Suitable for switching 12V circuits including:

  • Driving lights and LED light bars
  • Electric fans and cooling systems
  • Compressors and air lockers
  • Horns and auxiliary accessories
  • General 12V load switching up to 40A

Weight

0.772kg (pack of 20)

Frequently Asked Questions

What is a normally open relay?

A normally open (NO) relay has a contact that is open (disconnected) when the relay coil is not energised. When the coil receives a trigger signal, it energises and closes the contact, completing the circuit to the load. This is the most common relay type for switching accessories on in response to a signal.

What does resistor spike protection do?

When a relay coil is de-energised, it generates a voltage spike that can damage sensitive electronics in the vehicle. A resistor across the coil terminals suppresses this spike, providing basic protection for the triggering circuit. This is particularly relevant when the relay is switched by a vehicle ECU or control module output.

What is the standard mini relay terminal layout?

The 5-blade mini relay uses the standard ISO 12V automotive relay terminal layout: 85 (coil negative), 86 (coil positive), 30 (common/battery), 87 (normally open), 87a (normally closed — not active on a normally open relay). This layout is compatible with standard mini relay sockets.

Is this relay suitable for under-bonnet use?

Yes. The IP67 sealed housing provides full protection against dust and temporary water immersion, making it suitable for under-bonnet, exposed, and marine-adjacent mounting positions.

Is this product available in smaller quantities?

Yes. The ACX1940RBL is the same relay available as a single unit in a blister pack.