Kema Keur 716 RU-1828 Thermal Limiter Switch

The Kema Keur 716 RU-1828 is an electro-mechanical thermal limiter switch engineered for over-temperature protection in electrical systems. This adjustable changeover switch interrupts the circuit when a preset temperature threshold is exceeded, automatically restoring operation as temperature drops below the setpoint. The RU designation denotes changeover functionality, providing application flexibility across industrial and commercial installations requiring temperature-dependent circuit control.

## Technical Specifications

**Electrical Ratings:**
• Voltage: Up to 250 V AC; 400 V AC available in certain Type 716 configurations
• Current: 16 A / 6 A (250 V AC); 10 A / 2 A (400 V AC); 6 A @ 250 V~ for comparable models
• Dielectric Intensity: 1500 V AC / 5 seconds (terminal to terminal); 3000 V AC / 5 seconds (terminal to ground)
• Withstand Voltage: 1500 V AC / min
• Contact Resistance: 100 MΩ maximum
• Insulation Resistance: 500 V DC minimum, 100 MΩ minimum
• Electrical Life: ≥10,000 cycles

**Temperature Characteristics:**
• Maximum Switch-off Temperature: Up to 320 °C for Type 716 series
• Operating Range: Configurable based on model variant

**Physical Configuration:**
• Capillary Tube: Copper or stainless steel construction
• Capillary Length: Up to 3000 mm
• Protective Tubing: User-specified length available
• Sensor: Multiple diameter and profile options

## Key Features

• Automatic reset functionality upon temperature normalization
• Adjustable setpoint operation for application-specific requirements
• Changeover switch capability enabling flexible circuit control logic
• Extended capillary tube options supporting remote sensor placement
• Dual-material capillary construction accommodating corrosive environments
• High electrical life rating ensures extended service intervals

## Typical Applications

• Motor overheating protection
• Industrial heating element temperature control
• Transformer thermal management
• Process equipment safeguarding
• HVAC system over-temperature shutdown

## Compatibility & Integration

The Type 716 series architecture supports integration into control panels and thermal protection systems operating at standard European voltage and frequency standards. Modular capillary and sensor options enable customization for OEM applications requiring non-standard geometries or environmental protection.