High-Temperature Limit Switch Box
High-Temperature Limit Switch Box solutions are essential for ensuring tunnel ventilation dampers perform reliably during fire emergencies. These dampers are a critical component of fire safety systems, directing airflow to contain smoke and heat during emergencies. However, they can only function effectively if their control systems operate under extreme conditions. One of the most challenging requirements is withstanding prolonged high temperatures, ensuring continued operation in fire scenarios.
Kinetrol’s High-Temperature VLS Limit Switch Box has been successfully tested in real-world fire damper tunnel systems, proving its reliability at 250°C (482°F) for two hours. Engineered with high-temperature components and robust construction, this switch box enhances tunnel safety and ensures compliance with stringent fire protection standards.
The Need for High-Temperature Switch Boxes
In fire scenarios, temperatures within a tunnel can escalate rapidly, often exceeding 200°C. Under such extreme conditions, standard limit switch boxes can fail, leading to:
- Loss of damper position feedback, preventing proper ventilation control;
- Mechanical failure, causing dampers to become unresponsive;
- Electrical degradation, compromising system integrity.
A switch box that can withstand these temperatures is essential for ensuring tunnel ventilation dampers continue operating, directing smoke away from evacuation routes and supporting emergency response efforts.
Kinetrol VLS High-Temperature Limit Switch Box
1. Certified High-Temperature Performance
- Successfully tested for 250°C (482°F) endurance for 2 hours.
- Incorporates Viton seals and high-temperature wiring to prevent thermal degradation.
- Designed for 2 hours reliability in extreme fire conditions.
2. Robust and Corrosion-Resistant Construction
- Epoxy-coated diecast aluminium housing provides resistance against tunnel pollutants, moisture, and dust.
- Sealed to IP67/NEMA 6, ensuring protection from environmental exposure.
3. Versatile Mounting and Compatibility
- Direct mount onto Kinetrol rotary actuators for a compact, integrated solution.
- VDI/VDE (NAMUR) interface option for compatibility with other industry-standard rotary actuators.
- Easy wiring and quick setup with standard industrial fittings.
4. Reliable Position Feedback and Control
- Live position monitoring (open, closed, or intermediate) to ensure accurate damper operation.
5. Fail-Safe Operation for Enhanced Safety
- Fast response time ensures rapid damper activation in emergency situations.
- Failsafe mechanisms ensure dampers return to safe positions in case of power loss.
Ensuring Compliance with Fire Safety Standards
Tunnel ventilation systems must adhere to stringent fire safety regulations, including:
- BS EN 476 Part 20 – Fire resistance testing for up to four hours.
- UL555S Leakage Class – Ensuring containment of smoke and toxic gases.
- Elevated Fire Testing – Performance validation at 250°C
The Kinetrol VLS Limit Switch Box provides compliance-ready performance, helping tunnel operators meet safety standards without compromising on operational efficiency.
The Solution: Kinetrol VLS High-Temperature Limit Switch Boxes
Working in collaboration with BetecCad, Kinetrol supplied over 600 units of VLS High-Temperature Limit Switch Boxes for the tunnel ventilation dampers of the Bangalore Metro project.
These units were deployed across several tunnel sections, helping ensure:
- Reliable functionality in high-heat environments
- Compliance with international tunnel fire safety standards
- Efficient project delivery across hundreds of damper points
This large-scale implementation underscores how robust engineering and proven fire performance can help future-proof safety-critical infrastructure.