🔋 Take charge of your power — never get caught powerless again!
The Spartan Power 300A Battery On/Off Disconnect Switch is a heavy-duty, ignition-protected switch designed for RVs, marine, and automotive batteries up to 48V. With a continuous 300A rating and a 900A crank rating for 30 seconds, it safely isolates your battery to prevent drain and extend lifespan. Its simple 2-position knob and versatile mounting options make installation and operation effortless, trusted by professionals and DIYers for reliable power control.
| ASIN | B09WZF17KB |
| Item model number | SP-BS300A-RED |
| Manufacturer | Spartan Power |
| Product Dimensions | 8.26 x 8.26 x 9.14 cm; 280 g |
W**B
Highly satisfied with this battery cutoff switch. I have two on my boat for the batteries and they have performed excellent.
H**L
This DC electrical on/off shut-off switch is Hi-Grade and perfect for isolating (disconnecting) a battery on tractors and equipment to prevent any perisitic current draw, which could drain a battery dead. When ready to use the equipment, just turn on this switch. It is properly installed into the positive (red) cable where it is first connected to the post. There should be no wire/cable connections between the positive post and the shut-off switch. Any connections that could drain a battery should be wired "after" this switch.
J**Y
Does what it should but it is difficult to turn on/off. I recommend putting it in a location that is easy to access. Try it before you mount it.
J**M
Perfect replacement. High quality.
L**P
I added this in for control of my new LiFePo4 batteries to protect against charging/Discharging in very cold weather and during maintenance. You cannot work on this system without a way to disconnect all power positively! I have a Class A Motorhome and have not yet added solar (coming 2026). I will install another of these disconnects when I bring in solar.
Trustpilot
5 days ago
2 weeks ago
