Boosting Safety and Efficiency in Buses & Earthmoving Equipment with the Bolec SS301 Speed Activated Switch
When it comes to operating buses, trucks, and heavy-duty earthmoving equipment, safety and control aren’t optional—they’re essential. Whether you’re managing a fleet of public transport vehicles or maintaining construction machinery on rugged worksites, the ability to automatically control systems based on speed can prevent accidents, protect assets, and simplify operations.
Enter the Bolec SS301 Speed Activated Switch—a compact, durable, and intelligent module designed to monitor vehicle speed and trigger connected systems precisely when needed. Whether you need to prevent a bus door from opening while in motion or disable hydraulic functions during equipment transport, the SS301 provides the versatility and reliability you need.
🚦 What is the Bolec SS301?
The Bolec SS301 is a speed-sensing relay module that activates a ground-switching output once a preset speed threshold is reached. It’s engineered to operate across a wide range of vehicles and conditions—working seamlessly with 12V or 24V systems and accepting signal input from a variety of sources like magnetic pickups, ignition coils, and ECU outputs.
🔍 Why Speed-Based Control Matters in Transport & Heavy Equipment
In modern vehicles, speed doesn’t just affect performance—it impacts safety, maintenance, and system reliability. Using a device like the SS301 to monitor and react to vehicle speed unlocks a range of powerful use cases.
🚌 1. Bus Door Interlock Systems
- Prevents bus doors from opening while in motion
- Ideal for public transport, school buses, and shuttles
🚜 2. Travel Lockout for Earthmoving Equipment
- Disables hydraulic systems when traveling
- Protects against accidental activations
🚨 3. Speed-Activated Warning Systems
- Triggers alarms or lights when exceeding thresholds
⚙️ 4. Automated Lubrication Triggers
- Activates pumps based on RPM or speed
🔐 5. Access and Function Control
- Blocks certain controls unless vehicle is stationary
🛠️ Inside the SS301: How It Works
The SS301 works by monitoring a frequency-based signal. Once the input frequency exceeds the preset threshold, the unit’s internal relay closes, switching its output to ground.
⚡ SS301 Technical Specifications
- Voltage: 12 – 24V DC (Negative Ground)
- Input Signal: Sine/square wave, 1.5 – 50 VAC
- Frequency Range: 10 – 12,000 Hz
- Output: Ground switch (12V 3A, 24V 1.5A max)
- Adjustments: Coarse & fine tuning, adjustable hysteresis
- Size: Approx. 58 x 42 x 29 mm
🧰 Installing the SS301: A Mechanic’s Dream
- Mount the unit securely using tape or ties
- Connect IGN+ to a switched ignition source
- Connect GND to chassis ground
- Connect SGNL to the speed signal
- Connect OUT to your control relay or warning system
🧪 Tuning the Activation Threshold
- Use DIP switches to set the correct frequency range
- Adjust the pot until the LED indicates the threshold is set
- Fine-tune using the built-in LED for visual feedback
🧱 Built to Last
- Encapsulated electronics
- Compact, low-profile design
- Withstands vibration, heat, and dust
🔄 Compatible with a Wide Range of Systems
The SS301 is compatible with new and retrofit systems and offers a simple solution when digital logic is not required.
🛒 Ready to Upgrade Your Fleet?
The Bolec SS301 is a precision speed-based controller ideal for a wide variety of safety and automation tasks.
💬 Final Thoughts
In the world of transportation and heavy machinery, automation, safety, and control are key. The SS301 gives you the tools to tie system behaviors to speed easily and reliably.
Order now and bring smarter speed control to your vehicles.
Visit: www.bolec.com.au