The long-time pick-up (LTPU) and long-time delay (LTD) determine the overload protection characteristics of an adjustable electronic circuit breaker. The typical adjustment range for the LTPU is from ____times the circuit-breaker ampere rating.
1) 0.25 to 0.5
2) 0.5 to 1.0
3) 1.0 to 1.5
4) 1.5 to 2.0
