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M A I N T EN A N C E , ACC E SS O R I E S
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Accessories
ADVAC® smart coils
The ADVAC 38 kV circuit breaker employs smart coil
switch technology (SmartCS). The SmartCS
functions the same in a circuit as an older-style coil
would, except with added benefits for monitoring
and increased reliability compared to a standard
coil. The smart coil has a high impedance input due
to the onboard electronics. This high impedance
gives the device a lower current draw than
conventional coils, thus having a higher than
expected voltage drop (~60 V for 125 V system)
across the coil during coil supervision. The reduced
power consumption (<100 mA at 125 V) of the
SmartCS during supervision makes it suitable for
constant 24/7 monitoring with the main device in
the open or closed position. This also leads to a
reduce battery bank size when used with backup
systems. Additionally, SmartCS has a much faster
response time than a standard coil in that it
triggers from a voltage threshold for actuation,
whereas standard coils require a large current
increase in the circuit to create the necessary
magnetic force for activation.
The use of the wrong control coils in a circuit
breaker will cause improper operation and may
cause equipment to fail testing criteria.
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SmartCS main technical characteristics:
Power supply voltage range
Power supply voltage
24 to 48 V DC;
125 to 250 V DC; 120 to 240 V AC
Temperature range
-40 °C to +70 °C
Normal operating range smart coil
65% to 120% rated voltage
Inrush power consumption (1)
60 to 100 W / VA
Continuous service power (1)
1.5 W
Coil monitoring current
100 mA
Insulation voltage
1500 V AC common mode — 1 min.
(1) Indicative value that may vary based on the ambient temperature, but is independent of power supply voltage.
