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Accu-CT® Current Transformers

Revenue-grade ANSI C12.1 and C12.20 accuracy
Exception low-end accuracy and phase angle error
UL Listed—UL 2808 XOBA
CE mark
Opening split core style
Standard 0.333 Vac and optional 1.0 Vac outputs available
Two patents issued

*for commercial pricing contact sales

Accu-CT Current Transformers

Current Transformers

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

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 CT 0.94 to 5.55 in. dia. 100 to 2400 A 1.5%, 1.0%, 0.5%
TCB Solid-Core 5A Output CT 0.98 to 2.76 in. dia. 50 to 2000 A 1.5% to 0.5%

Support articles to assist with installing, configuring, troubleshooting, and using our WattNode meter products and accessories.