The DT-904 is the Basic test Equipment an Electrician cannot do without. DT-904 is a Dual Function Test Instrument utilized to Verify electrical Wiring Connections and the Functioning of Earth leakage / Residual current detectors devices by forcing the ELCB/RCD to trip.
This verifies that the protection device open the mains power supply circuit when a current higher than a certain amplitude circulate into the ground/earth wire. This ensures the Electrical installation meet safety and regulation requirements.
Measuring Ranges
Trip Current Settings | 5mA 10mA 30mA 100mA 300mA 500mA |
Test current
No Trip Test | 50% of circuit breaker trip current selected |
Trip Test | 100% of circuit breaker trip current selected |
Fast Trip Test | 250mA regardless of circuit breaker trip current selected |
Fault Trip Time | 2000ms (40ms for Fast Trip) |
Operational Voltage | 220V, 230V, 240V AC±10% 50/60Hz |
Accuracy
Test Current | ±3% at 220V 230V 240V AC |
Test Current Duration | 2000mS±5% for Trip and NO Trip Tests |
(limiter incorporated) | 40ms±5% for Fast Trip Test |
Trip Time (Measurement Accuracy) | ±2% reading ±3 digit |