This calculator can be used to calculate Tripping time of numerical as well as electro-mechanical relay at your installation within fraction of seconds. This app also tells the RESET TIME of electro-mechanical induction disc type relays. Trip Time co-ordination functionality is added newly for relay co-ordination purpose. Supported Standards are IEC and US. Supported Curves are - 1. Standard Inverse 2. Inverse 3. Very Inverse 4. Extremely Inverse 5. Long Time Inverse 6. Short Time Inverse Tra