The TBC TM-240 is a high-performance 2-pole Residual Current Circuit Breaker (RCCB) engineered to safeguard electrical installations against dangerous earth-leakage faults. With a rated current of 40A and 100mA sensitivity, this device automatically disconnects the circuit when residual current exceeds safe levels, providing essential protection against electric shock and reducing fire risk in residential, commercial, and light industrial applications. Built to IEC 60898-1 standards and certified by TÜV, CE, and CB, the TM-240 ensures reliable safety and compliance for modern electrical distribution systems.
The TBC TM-240 Residual Current Circuit Breaker represents a critical safety component in modern electrical distribution systems. This 2-pole RCCB is specifically designed to detect and respond to earth-leakage currents that could pose serious risks to personnel and property.
Operating at 240V AC with 50/60Hz frequency compatibility, the TM-240 continuously monitors the electrical circuit for imbalances between live and neutral conductors. When the residual current exceeds the preset threshold of 100mA, the device triggers an instantaneous disconnection, effectively preventing potential electric shock incidents and electrical fires caused by insulation failures or ground faults.
Built with electromechanical trip unit technology, this RCCB offers reliable performance without requiring external power sources. The Type AC classification ensures effective protection against alternating sinusoidal residual currents, making it suitable for standard residential and commercial applications.
The compact 35mm width design allows for efficient space utilization in distribution boards, while the robust construction ensures long service life with up to 10,000 mechanical operations. The integrated TEST button enables regular functional checks to maintain optimal safety performance throughout the product lifecycle.
Operating Principle: The TBC TM-240 employs an electromechanical detection system that continuously compares the current flowing through the live conductor with the return current in the neutral conductor. Under normal conditions, these currents are equal. When a ground fault occurs, current leaks to earth, creating an imbalance. When this residual current exceeds 100mA, the internal toroidal transformer detects the difference and triggers the mechanical trip mechanism, disconnecting the circuit within milliseconds.
Type AC Classification: This RCCB is classified as Type AC, designed to detect alternating sinusoidal residual currents. It provides effective protection for conventional loads including resistive heating, incandescent lighting, and standard AC motors.
Tripping Characteristics: The device features instantaneous tripping with no intentional time delay. At the rated sensitivity (100mA), the maximum tripping time is 0.2 seconds. At five times the rated sensitivity (500mA), tripping occurs within 0.04 seconds, ensuring rapid disconnection during serious fault conditions.
Installation Requirements: The TM-240 mounts on standard 35mm DIN rail and occupies 2 module spaces (35mm width). Proper installation requires adequate ventilation and clearance as specified in the dimensional specifications. The device should be installed in an upright position with the toggle switch accessible for manual operation and testing.
Testing and Maintenance: Regular testing using the integrated TEST button is recommended monthly or as per local regulations. This button simulates a ground fault condition to verify proper operation of the detection and tripping mechanism. Any failure to trip during testing indicates the need for immediate replacement.
| Electrical Characteristics | |
|---|---|
| Product Type | Residual Current Circuit Breaker (RCCB) |
| Poles | 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) | 100 mA |
| Earth-Leakage Protection Class | Type AC |
| Tripping Time | 1 × IΔn: t < 0.2 s 5 × IΔn: t < 0.04 s |
| Earth-Leakage Time Delay | Instantaneous |
| Trip Unit Technology | Electromechanical |
| Breaking Capacity | 10 kA |
| Mechanical Characteristics | |
|---|---|
| Control Type | Toggle |
| Mounting | DIN Rail |
| Mechanical Durability | 10,000 cycles |
| Electrical Durability | 4,000 cycles |
| Environmental Conditions | |
|---|---|
| Operating Temperature | −35 °C to +70 °C |
| Relative Humidity | 0 – 95 % |
| Degree of Protection | IP20 |
| Dimensions | |
|---|---|
| Height | 90.4 mm |
| Width | 35 mm |
| Depth | 75.3 mm |
| Standards & Compliance | |
|---|---|
| Standards | IEC 60898-1 and certified by TÜV, CE, and CB |
| Testing | Equipped with TEST button for functional verification |
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