Andrew yule & company has launched 11 kv oil immersed load break switch in extensible/non extensible pattern suitable for indoor/outdoor installations. The on-load isolator consists of an oil chamber. It houses the switch and air chamber where the mechanism is fitted. The oil switch has three positions: on, off and earth. The mechanism gives a quick break operation to all positions. The oil switch has quick-make and quick-break features and speed of make and break are independent of the operator. A three phase set of test spikes is provided when required for testing of cables. These spikes are inserted through a fully interlocked test access point in the top cover. The oil switch is rated for 630 a at 11 kv system and the rated short time current is 20 ka for 3 sec. The oil switch complies in all respect with the requirement of is:9920. This oil switch can be used for 3.3 kv and 6.6 kv voltage systems in addition to11 kv and it can also be used as an independent unit or can be coupled with yule make switch fuse units/bulk oil circuit breakers, to form a ring main unit or a switchboard.
