First Impressions of Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt
The Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt) is a seemingly simple component, yet it represents a crucial element in marine and automotive electrical systems. Manufactured by Sierra International, this push-pull switch offers Off-On(1)-On(1&2) SPDT (Single Pole Double Throw) functionality, making it versatile for various applications. My initial impression hinges on whether this seemingly basic switch can deliver the durability and reliability required in demanding environments.
I’ve been facing intermittent electrical failures in my classic offshore fishing boat, specifically with the navigation lights. The old rotary switch finally gave out, and I needed a robust replacement that wouldn’t corrode easily or fail under constant vibration. My requirements were simple: a reliable switch, easy to install, and capable of handling a decent amperage load.
Unboxing the Sierra International MP39570, I immediately noted the solid brass construction and the chrome-finished plastic knob. The switch felt substantial, not flimsy, suggesting a reasonable level of build quality. Its compact size with a 3/8-inch mounting bushing was also welcome, ensuring it would fit into the existing panel cutout.
I considered several other marine-grade switches from Blue Sea Systems and Cole Hersee, but the Sierra International switch had a more straightforward design and a significantly lower price point. The Blue Sea Systems switches, while excellent, were overkill for my simple needs, and the Cole Hersee options I found seemed to have mixed reviews regarding longevity in saltwater environments. The Sierra International MP39570 seemed like a good balance of affordability and expected durability.
My first impression is cautiously optimistic. The switch feels solid, but the true test will be how it performs after extended exposure to the harsh marine environment. I am excited to see if it lives up to the expectation of providing reliable electrical control for my boat’s navigation lights.
Real-World Testing: Putting Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt to the Test
First Use Experience
I installed the Sierra International MP39570 switch on my boat’s electrical panel, replacing the failed navigation light switch. The installation was straightforward, thanks to the two screw terminals and standard 3/8-inch mounting bushing. I tested the switch immediately in the marina before heading out for a coastal fishing trip.
The switch worked perfectly for controlling the running lights and the anchor light, offering the “Off-On(1)-On(1&2)” functionality. The “On(1)” position activated the side running lights, while the “On(1&2)” position turned on both the running lights and the anchor light simultaneously. No issues were encountered during the first use; the switch felt smooth and positive in its operation.
Extended Use & Reliability
After several months of use, including numerous fishing trips in both calm and choppy seas, the Sierra International MP39570 switch has held up surprisingly well. There is no visible corrosion on the brass components, and the chrome finish on the plastic knob still looks new. The switch continues to function reliably without any sticking or intermittent failures.
I regularly spray the electrical panel with a corrosion inhibitor to protect all connections, including the switch terminals. The cleaning process is simple: a quick wipe down with a damp cloth followed by a spray of corrosion inhibitor. I’ve previously experienced other marine switches seizing up after prolonged exposure to saltwater spray, but this Sierra International switch seems to be resisting corrosion remarkably well.
Compared to previous, more expensive switches I’ve used, the Sierra International MP39570 has proven to be a surprisingly durable and reliable option. It outperforms my expectations, especially considering its budget-friendly price point. It has stood up to the harsh marine environment and constant vibration without issue.
Breaking Down the Features of Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt
Specifications
Solid Brass Construction: This feature is crucial for corrosion resistance in marine environments, ensuring longevity and reliable electrical conductivity. The brass body resists rust and degradation when exposed to saltwater and humidity.
3/8 in. Mounting Bushing: The standard size makes it easy to install in most existing electrical panels. This dimension ensures compatibility with common panel cutouts, simplifying retrofitting or new installations.
Switch Positions: Off-On(1)-On(1&2) SPDT: This configuration offers versatility for controlling different circuits or lighting configurations. The Single Pole Double Throw (SPDT) design allows users to select between two separate circuits or combine them, as in my case with running lights and anchor lights.
Rating: 15 Amps @ 12 VDC: The 15-amp rating provides ample capacity for most standard marine and automotive electrical loads. This amperage rating is sufficient for controlling lights, pumps, and other common accessories.
Chrome Finish Plastic Knob: The chrome finish provides a decent aesthetic appeal and resists wear. While plastic, the chrome finish adds a touch of style and helps protect the knob from UV degradation.
Performance & Functionality
The Sierra International MP39570 performs its primary job of switching electrical circuits efficiently and reliably. The switch action is smooth, with a distinct “click” indicating each position change. Its simple push-pull design makes it easy to operate, even with wet or gloved hands.
The main strength of this switch is its consistent reliability in a demanding environment. A minor weakness is that the plastic knob could potentially be more durable, but so far, it’s held up without issue. For the price, it more than meets expectations.
Design & Ergonomics
The Sierra International MP39570 features a compact and functional design. The solid brass construction lends a feeling of quality, and the chrome-finished plastic knob provides a decent grip. Its lightweight build ensures it doesn’t add unnecessary weight to the electrical panel.
The switch is user-friendly with no learning curve. Its simple push-pull operation is intuitive, making it easy for anyone to use without specialized knowledge.
Durability & Maintenance
The solid brass construction and corrosion-resistant finish suggest that the Sierra International MP39570 should last for several years, even in harsh conditions. Regular application of corrosion inhibitor to the terminals will further extend its lifespan. The switch requires minimal maintenance.
Occasional cleaning with a damp cloth to remove salt spray or dust is all that is needed. Given its straightforward design, repairing the switch would likely involve replacing the entire unit, which is cost-effective due to its affordable price.
Accessories and Customization Options
The Sierra International MP39570 does not come with any additional accessories. However, its standard size and functionality make it compatible with various aftermarket electrical connectors and wiring solutions. There are no customization options for this switch beyond selecting different wiring configurations.
Pros and Cons of Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt
Pros
- Affordable Price: Significantly cheaper than many comparable marine-grade switches, making it an excellent value.
- Solid Brass Construction: Ensures superior corrosion resistance and longevity in marine environments.
- Easy Installation: Standard 3/8-inch mounting bushing and screw terminals simplify the installation process.
- Reliable Performance: Consistently provides reliable switching functionality, even after months of use.
- Versatile Functionality: The Off-On(1)-On(1&2) SPDT configuration allows for flexible control of multiple circuits.
Cons
- Plastic Knob: While durable enough, the plastic knob could be perceived as a weak point compared to metal alternatives.
- Limited Customization: Offers no customization options beyond wiring configurations.
Who Should Buy Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt?
The Sierra International MP39570 is perfect for boat owners needing a reliable and affordable switch for basic electrical functions like lighting, pumps, and accessories. It’s also suitable for automotive enthusiasts who need a simple on/off switch for custom projects. DIYers who need a general-purpose switch for various projects will also find it useful.
Anyone needing a heavy-duty switch for high-amperage applications or extreme environmental conditions might want to consider a more robust option. Also, those seeking a switch with advanced features or aesthetic customization should skip this product. Must-have accessories include wire connectors, a crimping tool, and corrosion inhibitor spray.
Conclusion on Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt
The Sierra International MP39570 Push Pull Switch Off On(1 On(1&2 Spdt) is a surprisingly capable and affordable switch that exceeded my expectations. Its solid brass construction, reliable performance, and easy installation make it an excellent value for anyone needing a basic electrical switch in a marine or automotive setting. The price is certainly justified by the performance and durability I’ve experienced.
I would definitely recommend this switch to boat owners and DIYers looking for a reliable and budget-friendly solution. If you need a simple, robust switch for basic electrical control, the Sierra International MP39570 is a solid choice. Upgrade your boat’s electrical system with this reliable switch and enjoy worry-free operation!