Hella Marine SPST Mini ISO Relay, 12V, 50/70A, Resistor Coil Suppression, Dust Cover
Got questions? Ask an expert!
Know someone who needs this?
Share it with your crew or mechanic.
Overview
The Hella Marine 007793031 is a 12 V, 4-pin Mini ISO power relay with a normally open (SPST/Form A) contact and built-in resistor coil suppression. It is rated at 50 A and carries an IP54 protection rating, making it a practical choice for switching higher-current DC loads from a low-current helm switch, keypad, or control module.
On a boat, this type of relay is commonly used to keep current out of the dash and shorten the high-amp wire run by placing the relay closer to the load or the distribution point. The resistor coil suppression helps tame switching spikes, which is useful when the relay is triggered by electronics or long control-wire runs.
Key features
- 12 V coil for 12 V DC marine electrical systems
- SPST/Form A normally open contact for straightforward on/off control
- 50 A current rating for many accessory and utility circuits
- Mini ISO footprint with 4 blade terminals for common relay sockets and fuse/relay panels
- Resistor coil suppression to reduce voltage spikes when the coil is switched off
- IP54 protection rating with a dust cover, suited to protected mounting locations
Installation and wiring
Plan the install so the relay sits in a relay box, electrical locker, or other protected area, not in a bilge space or anywhere it can be soaked. Use a proper relay socket or holder so the terminals are supported and the relay cannot work loose from vibration.
Size the fuse or breaker and wire gauge for the load you are switching, not for the control circuit. Keep the high-current feed protected close to the power source, and secure wiring runs so they do not chafe. Before crimping, confirm the terminal markings on the relay body and match them to your wiring diagram.
Compatibility and fit
This relay uses the Mini ISO 4-pin blade layout found in many relay/fuse panels and marine distribution builds that borrow standard automotive-style relays. It is intended for 12 V control voltage, so it is not a drop-in choice for a 24 V coil circuit.
On-board use cases
This relay is a good match for switching loads such as deck and spreader lights, horns, small pumps, fans, or an accessory bus feed, where you want the helm control to carry only a small trigger current. It also fits well in refits where a standard 4-pin Mini ISO relay socket is already in place and you need resistor-suppressed coil switching.
Maintenance and care
In saltwater environments, protect terminals from corrosion with a sealed relay box where possible, clean crimps, and heat-shrink insulation. Periodically check for warmth at the socket and for discoloration at the terminals, both of which can point to a loose connection or an undersized wire run.
Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.
Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.
Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.
Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.
Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.
Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.
To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.
We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.