TH-240 Residual Current Circuit Breaker (RCCB) 2P 40A 30mA

Protection Principle: The TH-240 operates on the principle of differential current detection. It 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 (such as current leaking through a person or damaged insulation), an imbalance is created. When this residual current exceeds 30mA, the RCCB's electromechanical trip mechanism activates, disconnecting the circuit within milliseconds.

Type AC Classification: This RCCB is classified as Type AC, meaning it is designed to detect and respond to alternating sinusoidal residual currents. It is suitable for protecting circuits with standard AC loads including lighting, heating, and motor applications without electronic control.

Tripping Characteristics: The device features instantaneous tripping with no intentional time delay. At the rated sensitivity (30mA), the tripping time is less than 0.2 seconds. At 5 times the rated sensitivity (150mA), the response is even faster at less than 0.04 seconds, ensuring rapid protection against dangerous fault conditions.

Durability and Reliability: Engineered for long service life, the TH-240 is rated for 10,000 mechanical operations and 4,000 electrical operations under load conditions. The electromechanical design ensures consistent performance without degradation over time.

Installation Requirements: The device must be installed on a standard 35mm DIN rail in an enclosure providing at least IP20 protection. Proper connection polarity must be observed, with the supply connected to the line terminals and the load to the load terminals. A test button is provided for periodic functional verification as recommended by safety standards.

• Residential electrical distribution boards and consumer units
• Commercial building electrical installations
• Small industrial control panels and machinery circuits
• Earth-leakage protection for single-phase power circuits
• Protection of socket outlet circuits in wet or outdoor locations
• Bathroom and kitchen electrical circuits requiring enhanced safety
• Workshop and garage electrical installations
• Retail and office building electrical systems
• Schools, hospitals, and public building electrical distribution
• Temporary power distribution systems for construction sites
• Agricultural and farm building electrical installations
• Renovation and upgrade projects requiring modern safety standards