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Terasaki advanced air circuit breaker

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article image The Terasaki TemPower 2 ACB.

TERASAKI has released a 1-second Icw ACB with the world’s smallest depth. Available from NHP , Terasaki's new TemPower 2 ACB brings modular design, high performance, space saving dimensions and a highly advanced-intelligent over current relay to the low voltage switchgear industry.

Terasaki has many years of experience and extensive data backing up its development of low voltage circuit breakers. In fact, Terasaki is the pioneer of current limiting technology.

Terasaki's pioneering development took place in 1963 giving it a unique position in the global market. It led Terasaki to hold the position of global market leader in the marine field, a position still maintained today.

"Maximum power from minimum volume" was a central tenet to the TemPower 2 design brief. With a depth of 290mm for the fixed type and 345mm for draw out types, the TemPower 2 is the smallest depth ACB in the world and, in terms of overall dimensions, also one of the smallest. The TemPower 2 has a common height and depth for all sizes.

The heart of the TemPower 2 is its totally unique "Double Break" dual contacts system. More than 20 patents relating to the "Double Break" system have been registered for the TemPower 2 ACB.

This unique contacts system allows for much faster clearing of short circuit currents. The maximum clearing time is 30 milliseconds which is less than half that of conventional ACBs.

Sharing the arc energy between two contact sets substantially reduces contact wear. Even though the TemPower 2 has double contacts it actually has fewer connection points per pole compared to its predecessor the AT Series resulting in significantly reduced temperature rise levels.

Terasaki is so serious about selectivity that all TemPower 2 over current relays have fully adjustable LSI characteristics as standard.

This provides an adjustable time delay on mild level overloads (L), the l2t characteristic - especially important for selectivity applications (S) - plus an instantaneous trip point adjustment (I) which can be set anywhere between 2 to 16 times the base current (In) setting.

This level of adjustability is vital when designing to provide selectivity with other protective devices such as downstream moulded case circuit breakers, fuses or upstream relays. In addition, a thermal memory is standard.

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