Vref

4.096V=

CT Current Transformers

Sensor	Range (Rms Amps)	Burden Resistor RD1 (Ω)	Calibration Coefficient (theoretical)
SCT-019-000 (200A/33mA)	200	43	139.535
SCT-013-000 (100A/50mA)	100	27	74.074
60	47	42.553
50	56	35.714
40	71.5	27.972
30	91	21.978
25	110	18.182
20	140	14.286
SCT-006 (20A/25mA)	20	56	14.286
10	110	7.272
5	140	3.571
SCT-024 400A:5A	400
SCT-024 400A:100mA	400	14.3	279.72
SCT-031 600:100mA	600	14.3	419.58

AC Voltage

All voltage reported as RMS value in the table below.

Sensor	Range @ sensor input	Range @ board input	RD1 (Ω)	RD2(Ω)	Gain Resistor RF (Ω)	Gain Resistor RG (Ω)	Calibration Coefficient (theoretical)
Any ac/ac adaptor up to 18V output	(EU) 77DE-06-09: 360V (UK) 77DB-06-09: 372V (US) 77DA-10-09: 180V	18V	53.6kΩ	4.7kΩ	0	∞	(EU) 77DE-06-09: 248.1 (UK) 77DB-06-09: 256.6 (US) 77DA-10-09: 124.0
ZMPT_1X_225*	408V	0.25V	0Ω	∞	22kΩ	4.7kΩ	281.65
RPICT4W3T1 L-L	435V	0.15V	0Ω	∞	42.2kΩ	4.7kΩ	300.64
ZMPT_1X_280	290V	0.15V	0Ω	∞	42.2kΩ	4.7kΩ	200.43
ZMPT_1X_140	145V	0.15V	0Ω	∞	42.2kΩ	4.7kΩ	100.21

• ZMPT_1X_225 is no longer used. Listed here for reference.

See Also

Burden Resistor calculation