Description
OEX ACX1940RB 12V 40A Normally Open Mini Relay Resistor Spike Protection IP67 Sealed 5 Blade Terminals Pack of 20
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 contacts, IP67 sealed housing and a removable mounting tab. Also available as a single unit as ACX1940RBL. Covered by a one year warranty.
Product overview
The ACX1940RB covers the most common relay requirement in automotive electrical work a normally open, 12V, 40A mini relay in the standard five-blade ISO footprint that fits virtually any mini relay socket or wiring harness. At 40A it handles driving lights, LED light bars, electric fans, compressors, air lockers, horns and other mid to high current accessories. Silver tin oxide contact material provides reliable switching performance and long contact life compared to standard copper contacts.
The resistor spike protection suppresses the voltage spike generated when the relay coil is de-energised, protecting sensitive electronics in the triggering circuit particularly relevant when the relay is switched by a vehicle ECU or control module output. The IP67 sealed housing provides full protection against dust and temporary water immersion for underbonnet and exposed mounting. The removable mounting tab allows flexible installation options. The pack of 20 suits trade workshops keeping relay stock on hand.
Features and benefits
40A rating: Suited to driving lights, LED light bars, electric fans, compressors, air lockers and other mid to high current 12V accessories.
Normally open contact: Circuit is open at rest and closes when the relay coil is energised the most common relay configuration for switching accessories on in response to a trigger signal.
Resistor spike protection: Suppresses the voltage spike generated when the relay coil is de-energised, protecting sensitive electronics and ECU outputs in the triggering circuit.
IP67 sealed housing: Fully protected against dust and temporary water immersion, suited to underbonnet, exposed and marine-adjacent mounting positions.
5 blade terminals standard ISO mini relay footprint: Compatible with standard mini relay sockets and harnesses across a wide range of vehicles and accessories.
Silver tin oxide contacts: Reliable switching performance 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: The ACX1940RBL is the same relay in a single blister pack.
One year warranty: Covered by a one year OEX warranty.
Technical specs
| Specification |
Detail |
| SKU |
ACX1940RB |
| Brand |
OEX |
| Type |
Mini Relay |
| Voltage |
12V |
| Current 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 |
| Weight |
0.772kg (pack of 20) |
| Warranty |
One year |
| Sold As |
Pack of 20 |
Frequently asked questions
What is a normally open relay? A normally open relay has a contact that is open (disconnected) when the relay coil is not energised. When the coil receives a trigger signal it closes the contact, completing the circuit to the load. This is the most common relay configuration 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 triggering circuit. A resistor across the coil terminals suppresses this spike, providing protection for ECU outputs and control module switching particularly important in modern vehicles with complex electronics.
What is the standard mini relay terminal layout? The 5-blade mini relay uses the standard ISO automotive relay terminal layout: 85 (coil negative), 86 (coil positive), 30 (common/battery), 87 (normally open) and 87a (normally closed not active on a normally open relay). This layout is compatible with standard mini relay sockets and harnesses.
Is this relay suitable for underbonnet use? Yes. The IP67 sealed housing provides full protection against dust and temporary water immersion, making it suitable for underbonnet, exposed and marine-adjacent mounting positions.
Is this product available in a smaller quantity? Yes. The ACX1940RBL is the same relay available as a single unit in a blister pack.
