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STG(Pg)Series 2Pole 4 Pole differential current Earth Leakage Circuit Breaker Fixed Type 440V rated voltage outdoor circuit breaker
GENERAL
An Earth-leakage circuit breaker (ELCB) is a safety device used in electrical installations with high Earth impedance to prevent shock. It detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected. Once widely used, more recent installations instead use Residual Current Circuit Breakers which instead detect leakage current directly.
Specification:
| Type | STG230 | STG420 |
| Rated Current(A) | 10A,15A,20A,25A,32A,40A,50A,60A | 10A,15A,20A,25A,32A,40A,50A,60A |
| Pole Number | 2Pole | 4Pole |
| Leakage acting current(mA) | 300mA,500mA | 300mA ,500mA |
| Range of break-off | 0.5~1.0X IΔn | 0.5~1.0X IΔn |
| Rated Voltage(V) | 220V-250VAC | 240V/415VAC |
| Tripping time | 100ms | 100mS |
| Life | 100000 times | 100000 times |
| Ambient Temperature | -5°C ~ +55 °C | -5°C ~ +55 °C |
Voltage-operated (ELCB)
Voltage ELCBs have been in widespread use since then, and many are still in operation but are no longer installed in new construction. A voltage-operated ELCB detects a rise in potential between the protected interconnected metalwork (equipment frames, conduits, enclosures) and a distant isolated Earth reference electrode. They operate at a detected potential of around 50 volts to open a main breaker and isolate the supply from the protected premises.
A voltage-operated ELCB has a second terminal for connecting to the remote reference Earth connection.
The Earth circuit is modified when an ELCB is used; the connection to the Earth rod is passed through the ELCB by connecting to its two Earth terminals. One terminal goes to the installation Earth CPC (circuit protective conductor, aka Earth wire), and the other to the Earth rod (or sometimes other type of Earth connection).