TT-240 Residual Current Circuit Breaker (RCCB) 2P 40A 10mA
TT-240
The TBC TT-240 is a high-performance 2-pole Residual Current Circuit Breaker (RCCB) engineered for reliable electrical distribution and superior personnel protection. Featuring ultra-sensitive 10mA earth-leakage detection, this device provides instantaneous disconnection when leakage current exceeds safe thresholds, making it ideal for applications requiring maximum protection against electric shock and electrical fire hazards. Built to IEC 60898-1 standards with robust electromechanical trip technology and 10kA breaking capacity.
Key Features
- High-sensitivity 10mA earth-leakage protection for enhanced personnel safety
- 2-pole (1P+N) configuration rated at 40A, 240V AC
- Instantaneous Type AC earth-leakage protection with electromechanical trip unit
- 6kA breaking capacity for reliable fault interruption
- Integrated TEST button for periodic functional verification
- Compact DIN rail mounting design (35mm width)
- Wide operating temperature range: -35°C to +70°C
- Manual toggle control with clear ON/OFF indication
- 10,000 mechanical cycles and 4,000 electrical cycles durability
- IP20 degree of protection suitable for standard enclosures
- Compliant with IEC 60898-1 international standards
- 50/60 Hz frequency compatibility for global applications
The TBC TT-240 Residual Current Circuit Breaker represents advanced protection technology for modern electrical installations. This 2-pole RCCB continuously monitors the balance between live and neutral conductors, detecting even the smallest earth-leakage currents as low as 10mA. When an imbalance occurs—indicating current leaking to earth through a fault or human contact—the device trips instantaneously, disconnecting the circuit within milliseconds to prevent serious injury or fire.
Designed for versatility, the TT-240 serves residential, commercial, and light industrial applications where personnel safety is paramount. Its compact 35mm width allows efficient installation in crowded distribution boards, while the robust electromechanical mechanism ensures reliable operation across extreme temperature ranges from -35°C to +70°C. The integrated TEST button enables regular functional checks to maintain optimal protection performance throughout the device's operational life.
With a rated current of 40A and breaking capacity of 6kA, the TT-240 provides comprehensive protection for medium-load circuits while maintaining compatibility with standard AC distribution networks at both 50Hz and 60Hz frequencies. The manual toggle control offers intuitive operation, and the device's proven durability—10,000 mechanical cycles and 4,000 electrical cycles—ensures long-term reliability in demanding environments.
Protection Principle: The TBC TT-240 employs a differential current detection mechanism using a toroidal transformer that continuously compares the current flowing through the live and neutral conductors. Under normal conditions, these currents are equal and opposite, producing no net magnetic flux. When earth leakage occurs, an imbalance creates flux in the transformer core, inducing a voltage that triggers the electromechanical trip mechanism.
Type AC Classification: This RCCB is classified as Type AC, designed to detect alternating sinusoidal residual currents. It provides reliable protection for standard AC loads commonly found in residential and commercial installations, including lighting circuits, heating systems, and conventional appliances.
Tripping Characteristics: The device features instantaneous tripping with no intentional time delay. At the rated sensitivity (1 × IΔn = 10mA), the TT-240 trips in less than 0.2 seconds. At 5 times the rated sensitivity (50mA), tripping occurs in less than 0.04 seconds, providing rapid disconnection for enhanced safety.
Installation Requirements: The TT-240 mounts on standard 35mm DIN rail and requires proper connection of the load-side earth conductor to the installation's earthing system. The device should be installed in an enclosure providing at least IP20 protection. Regular testing using the integrated TEST button is recommended monthly to verify proper operation.
Breaking Capacity: With a 10kA short-circuit breaking capacity, the TT-240 can safely interrupt fault currents up to 6,000 amperes, making it suitable for typical residential and commercial distribution systems where upstream protection limits available fault current.
- Residential distribution boards and consumer units for whole-house or circuit-specific protection
- Commercial electrical installations including offices, retail spaces, and public buildings
- Light industrial power systems and workshop electrical panels
- Personnel protection circuits in areas with increased shock risk (bathrooms, kitchens, outdoor outlets)
- Socket outlet circuits requiring high-sensitivity earth-leakage protection
- Electrical installations in damp or wet locations where enhanced safety is required
- Compliance installations meeting stringent electrical safety regulations
- Renovation and upgrade projects requiring modern earth-leakage protection
- Educational facilities, healthcare environments, and hospitality installations
- Temporary power distribution systems for events and construction sites
| Parameter | Specification |
|---|---|
| Product Type | Residual Current Circuit Breaker (RCCB) |
| Model Number | TT-240 |
| Product Application | Distribution |
| Control Type | Toggle |
| Poles Description | 1P + N (2 Pole) |
| Rated Current (In) | 40 A |
| Rated Voltage (Un) | 240 V AC |
| Frequency | 50 / 60 Hz |
| Network Type | AC |
| Earth-Leakage Sensitivity (IΔn) | 10 mA |
| Earth-Leakage Protection Class | Type AC |
| Earth-Leakage Protection Time Delay | Instantaneous |
| Trip Unit Technology | Electromechanical |
| Breaking Capacity | 10 kA |
| Tripping Time at 1 × IΔn | < 0.2 s |
| Tripping Time at 5 × IΔn | < 0.04 s |
| Mounting | DIN Rail (35mm) |
| Mechanical Durability | 10,000 cycles |
| Electrical Durability | 4,000 cycles |
| Control Features | Manual toggle with TEST button |
| Height | 90.4 mm |
| Width | 35 mm |
| Depth | 75.3 mm |
| Ambient Air Temperature | −35 °C to +70 °C |
| Relative Humidity | 0 – 95 % |
| Degree of Protection | IP20 |
| Standards Compliance | IEC 60898-1 and certified by TÜV, CE, and CB |