Product Description
Description
1HSB435455-2 enrev1 3
1.3 Operating mechanism
LTB circuit-breaker is operated by a motor-charged spring operating mechanism
type BLG.
The operating mechanism is connected to the poles’ mechanism on the circuit-
breaker pole via a pull-rod system.
The circuit-breaker is closed by the operating mechanism, which houses the closing
springs. On closing, the opening springs are tensioned, which are permanently
coupled to the poles’ operating mechanisms. The trip latch in the operating
mechanism keeps the circuit-breaker in the closed position. Opening of the circuit-
breaker only requires the release of the trip latch..
The normal operating cycle is:
O-0.3s-CO-3 min-CO (according to IEC) or CO-15s-CO (according to ANSI).
1.4 Standards
The circuit-breakers comply with the requirements according to IEC Publication
60056 and in most cases also ANSI C37 and are restrike-free when breaking a
capacitive load.
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