The TBC TT-225 is a high-performance Residual Current Circuit Breaker (RCCB) designed for distribution systems to provide instantaneous protection against earth leakage faults. With its ultra-sensitive 10mA trip threshold, this 2-pole RCCB offers superior personnel protection by rapidly disconnecting power when leakage current is detected, preventing electric shock hazards and ensuring safety in residential, commercial, and light industrial installations.
The TBC TT-225 Residual Current Circuit Breaker is engineered to provide critical protection against earth leakage faults in modern electrical distribution systems. This RCCB continuously monitors the balance between live and neutral currents, instantly detecting any leakage to earth that could indicate a fault or dangerous condition.
With its exceptional 10mA sensitivity threshold, the TT-225 is specifically designed for personnel protection applications where human safety is paramount. The instantaneous tripping mechanism ensures that dangerous leakage currents are interrupted in less than 0.2 seconds at rated sensitivity, and even faster at higher fault levels, minimizing the risk of electric shock.
Built with robust electromechanical trip technology, the TT-225 offers reliable performance across a wide range of environmental conditions, from -35°C to +70°C. Its compact 35mm width allows for efficient use of panel space while maintaining full 25A current carrying capacity at 240V AC.
Suitable for residential distribution boards, commercial buildings, and light industrial power distribution systems, the TBC TT-225 provides an essential layer of safety protection that complies with international electrical safety standards.
Protection Technology: The TT-225 employs electromechanical trip unit technology with Type AC earth leakage protection, designed to detect sinusoidal alternating residual currents. The device operates on a differential current principle, continuously comparing the current flowing through the live conductor with the return current through the neutral.
Tripping Characteristics: At rated residual current (1 × IΔn = 10mA), the device trips within 0.2 seconds. At 5 times rated sensitivity (50mA), tripping occurs in less than 0.04 seconds, providing rapid protection against potentially lethal fault conditions.
Network Compatibility: Designed for AC networks operating at 50/60 Hz frequency, with rated voltage of 240V AC. The 2-pole configuration (1P+N) provides protection for single-phase circuits with neutral connection.
Durability & Reliability: Tested for 10,000 mechanical operations and 4,000 electrical operations under load, ensuring long-term reliability in demanding applications. The toggle control mechanism provides clear ON/OFF indication and manual test functionality.
Installation: Standard snap-on mounting system compatible with 35mm × 7.5mm DIN rail (EN 60715). IP20 degree of protection suitable for installation in enclosed distribution boards and consumer units.
Standards Compliance: Manufactured and tested in accordance with IEC 60898-1 international standards for circuit breakers and residual current devices.
| Parameter | Specification |
|---|---|
| Product Type | Residual Current Circuit Breaker (RCCB) |
| Model Number | TT-225 |
| Poles | 2 Pole (1P + N) |
| Rated Current (In) | 25 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 |
| Protection Time Delay | Instantaneous |
| Trip Unit Technology | Electromechanical |
| Tripping Time at 1 × IΔn | < 0.2 s |
| Tripping Time at 5 × IΔn | < 0.04 s |
| Mounting Type | Snap-on fixing on 35 mm × 7.5 mm DIN Rail |
| Control Type | Toggle |
| Mechanical Durability | 10,000 cycles |
| Electrical Durability | 4,000 cycles |
| Height | 90.4 mm |
| Width | 35 mm |
| Depth | 75.3 mm |
| Operating 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 |
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