OEX ACX1942RBL Mini Relay 24V Normally Open 20A Resistor Protected Sealed

OEX ACX1942RBL 24V 20A Normally Open Mini Relay Resistor Spike Protection IP67 Sealed 5 Blade Terminals Single Unit

The OEX ACX1942RBL is a 24V, 20A normally open mini relay with resistor spike protection, supplied as a single unit. Designed specifically for 24V electrical systems found in trucks, buses, heavy commercial vehicles and 24V auxiliary setups, it provides reliable accessory switching where a 12V relay would not operate correctly. Silver tin oxide contacts, IP67 sealed housing and a removable mounting tab. Five-blade ISO mini relay footprint. Covered by a one year warranty.

Product overview

A relay's coil is designed to operate at a specific voltage a 24V relay requires 24V to energise its coil, and a 12V relay placed in a 24V system will not operate reliably. The ACX1942RBL is the correct relay for 24V electrical systems including trucks, buses, heavy commercial vehicles and 24V dual battery or auxiliary setups. At 20A it covers accessory and auxiliary circuit switching at 24V driving lights, fans, auxiliary loads and general accessory circuits.

The resistor spike protection suppresses the voltage spike generated when the relay coil is de-energised, protecting sensitive electronics and control outputs in the switching circuit. The IP67 sealed housing provides full protection against dust and temporary water immersion for underbonnet and exposed mounting. The five-blade ISO footprint matches the same mini relay socket used for 12V applications, so the same relay holders and harness adapters apply across both voltage systems.

Features and benefits

24V coil voltage: Designed for 24V electrical systems will not operate correctly in a 12V system. A 12V relay will not energise reliably in a 24V system either. Always match relay coil voltage to the vehicle's system voltage.

20A rating: Suited to accessory and auxiliary circuit switching on 24V trucks, buses, commercial vehicles and 24V dual battery systems.

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 control outputs in the switching circuit.

IP67 sealed housing: Fully protected against dust and temporary water immersion, suited to underbonnet, exposed and commercial vehicle mounting positions.

5 blade terminals standard ISO mini relay footprint: Compatible with standard mini relay sockets and harnesses across both 12V and 24V applications.

Silver tin oxide contacts: Reliable switching performance with excellent contact life.

Removable mounting tab: Flexible installation options for panel and bracket mounting.

Single unit: For individual installations or replacements.

One year warranty: Covered by a one year OEX warranty.

Technical specs

Frequently asked questions

Why is a 24V relay needed instead of a 12V relay? A relay's coil is designed to operate at a specific voltage. A 24V relay requires 24V to energise its coil a 12V relay will not operate reliably in a 24V system, and a 24V relay will not energise correctly in a 12V system. Always match the relay coil voltage to the vehicle's system voltage.

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.

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 active when energised) and 87a (normally closed not active on a normally open relay). This layout is the same across both 12V and 24V mini relays.

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 commercial vehicle mounting positions.