Appears similar in style to name brand marine/camper battery switches.This is a Single Pole Single Throw (SPST) switch meaning it has 2 connectors on the back and the switch either connects or disconnects them. This switch is not suitable for switching between 2 different batteries or bridging or isolating multiple batteries in a bank. It operates as a simple connector/disconnector.There are 2 10mm (3/8") studs on the back of the switch that you can connect to with appropriate sized ring terminals. The nuts are marked A2 (aka 304 stainless but not marine grade A4/316). Presumably the lock-washers are also stainless. The lower nuts (that you clamp the ring terminal against) and the studs are tinned copper (stainless is not a good conductor). You can see I gave them a scrape to double check in one of the photos.I was happily surprised by the quality of the switch. In the box you get a paper with basic specifications and example wiring diagrams. You get the switch with removable backing plate/cover. You also get 4 screws/nuts (appear stainless, probably A2) and 4 port covers for blocking the unused wire ports on the sides of the switch.The covers should be seen for optic purposes as well as to keep fingers and debris away from the battery cable connections. They are not waterproof and could not realistically be as you need freedom to run in cables into the switch. So it should be mounted somewhere where if it gets wet it can drain/dry.The switch is designed to be surface mounted on some kind of electrical panel or other flat surface and the cables are routed into the sides of the switch. Theoretically you could run cables through the surface to hide them, but this would likely only work with small cables (limited current capacity compared to the switch) as you are unlikely to get a large cable to make the 90º bend needed to connect if you approach the switch from the back instead of the side. Perhaps there are special 90º ring terminals you could potentially use.The "paperwork" says it can also be recess mounted, but I don't know what that really means other than if you have 2 parallel panels with it mounted to the back one and protruding through a hole on the front one.The switch is marked ignition safe and has a CE marking (not sure if it is actually CE rated or ignition safe). Ignition safe basically means it attempts to keep fuel fumes (e.g. in a gasoline powered boat) away from places where sparks might occur...the internal contacts of the switch. Indeed there is an o-ring sealing the contact area on one side, but there are screw holes and it isn't clear if the shaft on the switch knob is also sealed. Safety first in a fume environment, don't trust the labels...use your blowers to keep fumes away.The internal contacter of the switch looks like it can handle a lot of current in tandem with the M10 (3/8) bolts. It works against the bolt heads which is interesting but maybe normal in these types of switches. I'm not sure how much separation the contactor has from the bolt heads in "off" vs "on" position either.One funny thing, if you mount the switch so the text is right side up, you notice that the battery on the knob in the middle of the sticker is upside down for some reason. Doesn't affect function though.The included paper says it is rated for 12-48 Volts (presumably DC) at 275 amps continuous (more for intermittent or cranking). Not sure I would trust the rating on the little slip of included paper. But for medium duty, these certainly seem solid enough.Seems like a great product!The only problem I found is the following: The provided mounting screws are bigger than the included nuts. The screws are also too large for the mounting holes in the switch. The nuts seem to be the correct size as they fit in the cast-in nut recesses in the bottom of the switch. But there is also the question how that is supposed to work for mounting, if you put the screws in from the top of the switch and the nut is sitting in a cast-in hex in the bottom of the switch...you are just securing the screw/nut to the switch but not securing the switch to anything. So you will need to get your own mounting hardware. A better design would be to have the captive nut castings in the backing plate and then additional screw holes in the backing plate to secure it to the mounting surface. Then the switch could be mounted/unmounted from the backing plate (captive nuts) using machine screws through the housing. In addition to correct hardware, the manufacturer would also do well to provide diagrams on mounting options. Other than this, the product is perfect.

Ich habe das Schalter-Duo gekauft, um in unserem Aufbau befindlichen Wohnkoffer einfache Stromtrennung durchführen zu können. Dafür sind die Schalter auch konzipiert, für der Verbindung von zwei Batterien etc. untereinander nicht. Montiert habe ich die Schalter bislang noch nicht, vom äußeren Anschein her sind sie recht sauber und ganz ordentlich verarbeitet, die bei uns bei 12 V anliegenden Stromstärken dürften sie problemlos Händeln können. Und so an dieser Stelle, auch gerade hinsichtlich des Preis-Leistungs-Verhältnisses, vier Sterne.Auch wenn wir dieses Schalter am Rande des Amazon Vine-Programms bis auf die steuerliche Betrachtung als Produkttest kostenlos zur Verfügung gestellt bekommen haben, so fühlen wir uns dennoch einer objektiven & ehrlichen Bewertung verpflichtet