NCS37010
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9
RECOMMENDED EXTERNAL COMPONENTS:
Component Type Instance Value Note
SCR Q2−Q3 − ON−MCR08
Diode Dx − ON−1N4007
NPN Q1 − ON−MMBT6517LT1G
NMOS M1 ON−NTK3043K
LED L1 − LED pins drive opposite polarities
Capacitor CapSUP
1 − 4.7 mF
For a full bridge rectifier
Capacitor CapGN 1 − 10 nF Matched to current transformer
Capacitor CapIDF 220 nF Sets the differential corner frequency at 1 kHz
Capacitor CapBias 10 nF Filtering component for CTbias voltage.
Capacitor CapCT 2.2 − 10 nF Filtering and resonant capacitor for CT.
Capacitor CapSCR − Filtering component.
Resistor ResD 40 − 80k Matched to current transformer.
Resistor ResGN 100 − 400k Matched to current transformer.
Resistor ResMLD 400 − 800k Limiting resistor for the Mains Level Detector (MLD) input.
Resistor ResTI 400 − 800k Limiting resistor for the Trip Indicator(TI) input.
Resistor ResMAIN 8 − 45k Full bridge rectifier power supply.
Resistor ResGFTST 1.3 − 30k Sets the external differential test current (8 mA).
Resistor ResLED 1 − 5k Sets the brightness of the LEDs.
Resistor ResPTT 400 − 800k Needed for the SCR/Solenoid test.
Resistor ResNPN 10k Bias resistor for NPN gate.
TVS T1 − ~250 − 400 V
LED FUNCTIONS
Device Function Device State Status Indicator (Breaker)
Normal
No Power/ Line Load
Reversed
OFF
Power Up Blink once within 3 sec (Red)
Reset (Entered through PTT) OFF
Tripped OFF
Abnormal
Self−Test Fails
(Tripped)
OFF
Self−Test Fails
(Reset)
Blink (Red)
No Trip on Fault Blink (Red)
Self−Test Fails to remove
Lockout
Blink (Red)
