Vol. 10 No 4 August 2002
Hermetically Sealed Relay TO-5
Hermetically sealed relays are electromagnetic relays housed in a hermetically sealed enclosure for trouble-free operation of the constituent parts to perform switching operation by armature action. These relays are iDEAL for controlling the making and breaking of circuits of electrically operated equipments.
TO-5 is a hermetically sealed miniature relay with welded enclosure to perform reliably under the most severe conditions. The relay consists of a diode for coil transient suppression. The relay is iDEAL for use in missiles, aircraft, spacecraft, and ground support and electronic communication equipment and meets the electrical and environmental performance requirements of US Military Specification MIL-R-39016/15. TO-5 is manufactured by M/s CII Guardian International Ltd, Kochi.
Heat Shrinkable Boot-Silverline
Silverline heat shrink boots are molded parts with a silver coated copper wire mesh covering the inner side of boot. These boots shrink on application of predetermined amount of heat to take up a definite shape. When boots are shrunk, the wires of the mesh get closer by providing strain relief at the cable outlet of the multiway connectors. The shrink ratio of the boot is 2:1. The boots are noncorrosive with high degree of resistance to chemicals, solvents, oils, lubricants and fungus. Silverline boots are available in two different sizes, 12 and 16. The boots are intended for constructing robust multiconductor cable connector assemblies. They not only provide strain relief at the cable outlet of the multicontact connector but also protect connector cable assembly from EMI. They seal cable harness from atmospheric and other contaminants that would affect the performance of the joints. The boots are manufactured by M/s REPL Engineering Ltd, Mumbai.
Two- & Three- Electrode Spark Gaps
Spark gap is a unique gas filled high-energy switch able to change quickly from high impedance state to a low impedance state in response to terminal voltage applied across electrodes. The gap is an excellent insulator until the voltage across it reaches a critical value. At or above this critical value, an arc is rapidly established, which is able to carry a large current with small voltage drop.
Light & Heavy Tow Cables
Tow cable is a special type of electromechanical cable designed for underwater applications. This composite cable intended for towing operation of SONAR systems, provides electrical and mechanical link to these systems. Light tow cable has satisfactorily met the requirements of 10,000 cycles of flexural strength test at 750 kg, low temperature test at -40°C for four hour and thermal cycling test of 2 cycles between -20°C and +80°C.
Heavy tow cable is surrounded by a polyurethane sheath (outer sheath) andarmoured with stainless steel wire of 1.85 mm dia. This cable has met the requirements of 10,000 cycles of flexural strength test around a pulley of diameter equivalent to the minimum-bending diameter, i.e., 900 mm with a constant load of 1000 kg. These tow cables are manufactured by M/s Uniflex Cables Ltd., Umbergoan, Gujarat and M/s NICCO Corporation Ltd, West Bengal.