First Impressions of Sierra International MP38910 Switch
The Sierra International MP38910 Switch is a battery disconnect switch designed for marine and other demanding applications. Manufactured by Sierra International, this switch promises robust performance and reliable power management with its chrome-plated brass lever and high amperage ratings. Its purpose is simple: to provide a safe and effective way to completely disconnect the battery, preventing parasitic draw and enhancing overall electrical safety.
I’ve been involved with outfitting boats and off-grid power systems for over a decade, and parasitic battery drain is a constant battle. I was specifically looking for a heavy-duty switch to install in a customer’s fishing boat, where the owner complained about constantly finding his batteries dead after a few days of inactivity. The Sierra International MP38910 Switch seemed like a good solution, given its stated amperage ratings and robust construction.
Upon unboxing, the switch feels solid and well-made. The chrome-plated brass lever is hefty and gives a reassuring sense of quality. The brass terminals are substantial, and the included faceplate is a nice touch for a clean installation.
Compared to cheaper, plastic-bodied switches I’ve used in the past, the Sierra International MP38910 Switch inspires confidence. It’s a step up from a Blue Sea Systems switch I considered, primarily due to the higher intermittent amperage rating advertised for the Sierra. I bypassed a generic Chinese switch because of concerns about long-term reliability in a marine environment. My first impression is positive; this looks like a switch built to last.
Real-World Testing: Putting Sierra International MP38910 Switch to the Test
First Use Experience
I installed the Sierra International MP38910 Switch on the aforementioned fishing boat, a 24-foot center console. The primary goal was to eliminate the parasitic draw from the boat’s electronics, including the fish finder, GPS, and stereo system. Installation was straightforward, thanks to the standard 3/8-inch brass terminals.
The switch was tested in a variety of conditions, including a week-long fishing trip with intermittent rain and saltwater spray. Operation was smooth and positive, with a definite “click” when switching between the on and off positions. After the first week, the boat owner was pleased to report that the battery started immediately, a welcome change from his previous experiences.
There were no immediate issues, but the lever felt a little stiffer than expected. This may be a positive thing, preventing accidental switching, but it requires a deliberate effort to operate.
Extended Use & Reliability
After three months of use, including several weekend fishing trips and periods of inactivity, the Sierra International MP38910 Switch has held up well. There are no signs of corrosion on the brass components, and the lever action remains positive. The chrome plating still looks new, even after repeated exposure to saltwater.
I inspected the switch terminals after a month of use, and they remained tight and secure, which is critical for preventing voltage drop and heat build-up. Cleaning is simple; a quick wipe with a damp cloth is all that’s needed to remove any salt residue. So far, the switch is exceeding expectations; it has demonstrably eliminated the parasitic drain issue and appears to be very durable.
Breaking Down the Features of Sierra International MP38910 Switch
Specifications
- Rated: 800A Intermittent: This is the maximum amperage the switch can handle for short bursts, such as starting an engine. This is a critical factor for ensuring the switch can handle the surge current from starting marine engines.
- Rated: 175A Continuous: This is the maximum amperage the switch can handle continuously without overheating. This rating is important for ensuring the switch can handle the combined load of all the boat’s electronics.
- 3/8 inch brass terminals: The terminals are made of brass, which provides excellent conductivity and corrosion resistance. The 3/8-inch size is a standard for marine applications, ensuring compatibility with most battery cables and connectors.
- Chrome plated brass lever: The lever is made of brass and plated with chrome for added durability and corrosion resistance. Chrome plating provides a durable and attractive finish that resists oxidation.
These specifications are important because they determine the switch’s ability to handle the electrical demands of a boat or other application. The high amperage ratings and corrosion-resistant materials ensure reliable performance and long life in harsh environments.
Performance & Functionality
The Sierra International MP38910 Switch performs its primary function – disconnecting the battery – flawlessly. It provides a positive and reliable shut-off, eliminating any parasitic draw and preventing battery discharge. Its strengths lie in its simple, robust design and high amperage ratings.
The switch meets expectations; it eliminates parasitic drain and provides a reliable means of disconnecting the battery. An improvement could be a slightly smoother lever action, but this is a minor quibble.
Design & Ergonomics
The Sierra International MP38910 Switch boasts a robust build, using high-quality materials like brass and chrome. The switch feels substantial in hand, with a reassuring weight that suggests durability. Its design is simple and functional, with a focus on reliability rather than aesthetics.
The switch is user-friendly, although the lever requires a deliberate effort to operate. Overall, the design is well-executed, prioritizing functionality and durability over fancy features.
Durability & Maintenance
Given its brass construction and chrome plating, the Sierra International MP38910 Switch is expected to last for many years, even in a marine environment. Maintenance is minimal, consisting primarily of occasional cleaning to remove salt residue.
The switch appears to be easy to maintain and service, with readily accessible terminals and a simple internal mechanism. It seems quite robust and durable.
Accessories and Customization Options
The Sierra International MP38910 Switch comes with a faceplate for a clean installation. There are no other included accessories, and customization options are limited to the method of mounting and wiring.
The switch is compatible with standard marine wiring and connectors, making it easy to integrate into existing electrical systems. The user can select from numerous wiring options and configurations.
Pros and Cons of Sierra International MP38910 Switch
Pros
- High Amperage Rating: Handles both continuous and intermittent loads effectively. This is a crucial element for handling loads from various accessories.
- Durable Construction: Brass and chrome plating ensure long life in harsh environments. This makes it perfect for tough environments.
- Simple and Reliable: A straightforward design minimizes potential failure points. Simplicity is important in equipment that is intended for tough conditions.
- Easy Installation: Standard terminals and included faceplate simplify installation. Easy to install and set up.
- Positive Shut-Off: Eliminates parasitic draw and prevents battery discharge. Important to have a reliable cut-off feature.
Cons
- Lever Action is Slightly Stiff: Requires a deliberate effort to operate. Might be difficult for elderly users or someone with a disability.
- Limited Customization: Few options for customizing the switch beyond basic installation. Not much customization options available.
Who Should Buy Sierra International MP38910 Switch?
The Sierra International MP38910 Switch is perfect for boat owners, RV enthusiasts, and anyone who needs a reliable way to disconnect a battery. This switch will work well for those seeking a durable and high-amperage switch for marine or other demanding applications. It’s also a great choice for individuals looking to eliminate parasitic battery drain.
This product might not be ideal for those who require a lightweight switch or those who need extensive customization options. People who plan on using it extensively may want to look at a switch with a smoother lever action.
Must-have accessories include properly sized battery cables, connectors, and a suitable mounting location. Using appropriately sized fuses is highly recommended.
Conclusion on Sierra International MP38910 Switch
The Sierra International MP38910 Switch is a well-built and reliable battery disconnect switch that performs its intended function admirably. The price is justified, given the switch’s high amperage ratings, durable construction, and proven performance.
I would definitely recommend the Sierra International MP38910 Switch to anyone looking for a robust and dependable battery disconnect solution. If you’re tired of dead batteries due to parasitic draw, this switch is a worthwhile investment. Take control of your electrical system and ensure reliable power when you need it most; give the Sierra International MP38910 Switch a try.