Safety is a must when working with powerful electronics, particularly in applications like electric vehicles, combat robotics, or large RC models. One of the most important safety features you can include in your system is a dependable kill switch.
The MS02 and MS05 kill switches are currently among the most widely used options available. However, what precisely do they do? What distinguishes them? And which one is best for your configuration?
Let's examine the specifics.
What Is a Kill Switch?
A kill switch is a safety feature that, in an emergency, will immediately cut off power to your system. Usually, it's employed to:
Turn off the electricity when a system fails.
Verify adherence to competition regulations (such as in RoboWars).
Permit high-voltage systems to be handled and transported safely.
A manual kill switch that can isolate the battery from the rest of the system is typically required in combat robotics.
MS02 Kill Switch
For medium to high power systems, the MS02 is a small, durable kill switch that is perfect for hobbyweight and beetle robots as well as smaller electric vehicles.
Key Features:
- Capable of withstanding up to 100A continuously
- Tiny form factor
- Design of a detachable key or plug
- Easy two-wire functioning
- Dependable copper connections with low resistance
Best For:
- Hobbyweight and beetleweight combat robots
- Mid-range VESC and ESC configurations
- Construction of lightweight e-scooters and e-skateboards
Pros:
- Lightweight and simple to install
- Easy to set up and use
- Widely accessible and reasonably priced
Limitations:
- Continuous loads over 100A might not be appropriate.
- Lacks integrated waterproofing; for outdoor use, a casing is required.
MS05 Kill Switch
The MS02's larger sibling, the MS05, is designed for high-voltage and high-current applications. Larger robots, EV conversions, and other applications involving significant current frequently use it.
Key Features:
- Capable of handling currents up to 300A+
- Strong terminals
- Integrated mounting plate
- Screw-down or key-lock safety system
- Able to manage big 4AWG to 0AWG cables
Best For:
- Robots that are middleweight and heavyweight
- Electric go-karts or high-performance EVs
- Lithium battery systems for industry
Pros:
- Incredibly resilient to large loads
- Dependable in challenging circumstances
- Able to function as a full battery isolator
Limitations:
- Heavier and bulkier
- More expensive
- Requires the right cable lugs in order to connect
MS02 vs MS05: Quick Comparison
| Feature | MS02 | MS05 |
| Current Rating | Up to 100A | 300A+ |
| Size | Compact | Larger, Heavy duty |
| Use Case | Beetle/Hobbyweight Robots | Heavyweight Robots |
| Installation | Plug-and-play | Screw mount, require lugs |
| Cost | Budget Friendly | Premium |
Which One Should You Choose?
For small to mid-sized robots or e-vehicles, choose MS02 if you want a lightweight, small, and reasonably priced solution.
If your build requires maximum durability for competition or rugged use, involves large battery packs, or draws a lot of current, go with MS05.
Final Thoughts
A kill switch is an essential safety feature in any powerful system, not just a part. Your power needs, financial situation, and available space will all play a role in your decision between the MS02 and MS05. Before your next big ride or match, make sure it's installed correctly and tested.
Do you need assistance selecting the best kill switch for your project?
