Havells On-Load By-Pass Switch connects normal supply to the loads in case stabilized source fails. In fact, it By-passes the UPS/Servo Stabilizer in case of their failure and provides a means of connecting alternate supply to the load. The switch also ensures isolation of the up-stream and down-stream circuit.
Range : In current ratings of 63A-100A
Specification : IEC:60947-1&3 / IS:13947-1&3
Features
- Compact Size, Quick make & Quick break mechanism.
- Extended outgoing terminals
- Enclosed housing to avoid dust ingress
Application
The By-pass switches are designed to meet customer specific needs particularly in IT related industries where UPS and Servo stabilizers provide main source of supply. In the event of an emergency, normal supply can be made available to the services without interrupting any installation and at the same time providing time for maintenance of UPS systems without causing break down of services.
Operation
The By-pass Switch is operated manually with handle. It provides 3 stable positions namely :
- Loads are open circuited
- Loads are connected to stabilized supply
- Loads are connected to the normal supply
Single Line Diagram
At '0' position, all the contacts of the three disconnectors are open and thereby provide isolation. At 'I' position, disconnectors No.I and III are closed and disconnector II is open. Hence stablized supply is connected to the load. At 'II' position only disconnector No.II is closed and I & III are open. Hence bypassing the UPS and connecting the load directly to normal supply.
Auxilliary Contact
Auxilliary contacts having I NO.NC or 2 NO.NC configuration can ben provided for indication and signaling purposes.
