Hella Marine Mini ISO Relay, SPST, 12V, 50A, Mounting Bracket

Overview

The Hella Marine 007793041 is a 12V Mini ISO power relay with a single normally open circuit (SPST, Form A) rated for 50A continuous on the N/O contact at 85°C.

It is a practical way to run higher-current gear from a low-current switch or control output. The coil uses resistor suppression (680 ohm), which helps reduce coil kickback without forcing a polarity on the coil connections.

The relay has an IP54-rated housing, a black body, and an integrated mounting bracket, so it can be secured in a protected electrical area that sees vibration and occasional splash, but not direct washdown or standing water.

Key features

• Nominal 12V coil with up to 18V max coil voltage; pick-up at 8.0V or less and drop-out at 1.3V or more
• Coil resistance 100 ohm (plus or minus 10%), with resistor suppression for non-polarized coil wiring
• 50A continuous switching capacity on the normally open contact, with inrush capability up to 200A (lamp) or 150A (motor)
• Fast response with operating and releasing times up to 10 ms
• 4-pin Mini ISO layout with standard relay terminal numbering (85/86 coil, 30 feed, 87 switched output)
• Blade terminals sized 6.3 x 0.8 mm (85/86) and 9.5 x 1.2 mm (30/87), plus bracket mounting for a secure installation

Electrical and system integration

Terminal 30 is the high-current feed, terminal 87 is the switched output, and terminals 85 and 86 power the coil. Because the load tabs are larger (9.5 x 1.2 mm), confirm your relay socket or crimp terminals are the correct size and rated for the current you are running.

On a 12V boat, this relay is commonly used to let a dash switch, breaker panel switch, or electronic controller trigger a larger load such as deck and spreader lights, a horn, pumps, or other accessories. Protect the feed to terminal 30 with the right fuse or breaker for the wire and the load, and keep the high-current run short to reduce voltage drop.

Installation and placement on board

Use the mounting bracket to fasten the relay to a bulkhead, under-helm electrical panel, or inside an enclosure where it stays accessible for inspection. IP54 handles splash and dust, but it should still be kept out of bilges and away from areas that stay wet or get hit with a hose.

If the circuit has a heavy startup surge, confirm the load is within the relay’s inrush limits and that your wiring and connections stay cool under load.

Who it fits

This relay is a solid match for 12V systems that need straightforward on/off control of a single higher-current circuit from a small control signal, especially when you want a bracket-mounted Mini ISO relay rather than a loose plug-in cube.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

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