)
Ii
(Min. Some timing relays begin the time delay when the
relay energized.1
1
10
100
1,000
10,000
Ii
= Instantaneous Pickup
-20% +20%
Ii
Ii
(Max.
Time Current Characteristics Curve
Siemens Frame Circuit Breaker
.
.
Thyristor family multi-layer semiconductor devices that includes
silicon controlled rectifiers (SCR), gate turnoff (GTO) thyristors,
and other similar devices. Others begin the time delay when the relay
is de-energized.01
.
Synchronous Speed (Ns) =
f frequency
P number poles
120f
P
Thermal-Magnetic Used describe device that uses both heat and magnetism
as part its operating principles.37
Synchronous Speed The speed the rotating magnetic field three-phase motor.Thyristors are often used rectifier or
power switching circuits.1
3,000
1,000
100
10
1. For example, thermal-
magnetic circuit breaker can tripped either heat or
magnetic force resulting from overcurrent.
Synchronous speed determined the line frequency and the
number motor poles.0
.
Thermistor device used sense temperature that varies resistance as
temperature changes.
Time-Current Curve graph showing how long before circuit breaker will trip at
each level fault current.)
Times Continuous Current Rating (In
)
Time
in
seconds
Trip Unit 525
Timing Relay control relay that incorporates preset delay contact
response
