Continental Control Systems sells several different series of current transformers (CTs) in various window sizes, current ranges, and accuracy grades. Most WattNode meters use voltage output CTs (not current output ratio CTs) CTs are suitable for use in dry (indoor) locations in 50 or 60 Hz services up to 600 Vac. Low-voltage output CTs contain a built-in burden resistor and are calibrated to output 0.333 Vac when the CT’s rated full-scale current flows through the conductor being measured. Safe, low-voltage output CTs do not need shorting blocks because the internal burden resistor is always connected. Shorting blocks should always be used on 5 amp output CTs.
To select a CT, we recommend first deciding on a style, either a split-core (opening ) or a solid-core (non-opening) CT, then select the model you need based on the maximum load current you are measuring and the size of the conductor being measured.
- For complete specifications, available current ranges, and datasheet downloads click on the individual series part number links in the tables below.
Current Transformer Line Card
- CT Line Card (PDF, 1 page)
0.333 V Output CTs
5 A Output CTs
|Family (click on link)||Window||Amp Ranges||Accuracy|
|Current Transformers 0.333 V Output|
|ACTL-0750 Split-Core CT||0.75 x 0.75 in.||5 to 250 A||1.0%, 0.5%|
|ACTL-1250 Split-Core CT||1.25 x 1.83 in.||250 to 600 A||1.0%, 0.5%, 0.3%|
|CTBL Large Split-Core CT||Varies||800 to 6000 A||1.5%|
|CTML-0350 Split-Core CT||0.36 x 36 in||5 to 70 A||1.0%|
|CTRC Rogowski Coil||3.1 to 12 in. dia.||Up to 6000 A||1.0%|
|CTS Split-Core CT||2.0 x 2.0 in.||400 to 1200 A||1.0%|
|CTT Solid-Core CT||0.3 to 1.25 in.||5 to 400 A||1.0%|
|TCL-B Solid-Core CT||0.5 in. dia.||50 A, 100 A||0.3%, 0.2%|
|Current Transformers 5 A Output|
|Split-Core 5A Output CTs||0.94 to 5.55 in. dia.||100 to 2400 A||1.5%, 1.0%, 0.5%|
|TCB Solid-Core 5A Output CTs||0.98 to 2.76 in. dia.||50 to 2000 A||1.5% to 0.5%|