Controls & Switchgear Company offers air circuit breakers. Salient features: lightest and most compact for a given capacity; only 4 frame sizes in the entire range, 630 to 6300 A, resulting in maximum interchangeability and minimum inventory of spares; high value of breaking capacity, 45 kA to 100 kA, and making capacity, 94.5 kA to 220 kA at 415 V AC; total breaking time less than 30 m sec including arcing time of less than 10 m sec; highest values of mechanical and electrical endurance due to patented mechanism design and special; sintered metal contacts; highest degree of system protection and coordination due to the use of microprocessor based protection releases; most simple to operate and maintain - only a screw driver and a spanner required to change arcing contact; high dielectric strength even in hot and humid conditions due to use of class `B` and `F` insulating materials; fibre glass safety shutter for safety of operating personnel; no thermal derating for DC application; available in 3 or 4 pole for entire range and also fixed/draw-out version; neutral pole [in 4 pole] closes early and opens later to prevent transient over voltages in loads connected between live and neutral lines; and tested for most onerous environmental conditions and approved for marine duty application by Indian Registrar of Shipping.