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S77-Solid-Core
Current Transformers
- Easy split-core installation: ACUCT Split Core Current Transformers install around existing branch circuit conductors without disconnecting cables, reducing panel downtime.
- Designed for power metering: Converts AC operating current into a 333 mV signal for use with ACI single-phase and three-phase power meters.
- Multiple current ranges: Available in 50A, 100A, 200A, 300A, 400A, 600A, 800A, and 1000A models to match a wide variety of electrical monitoring applications.
- High measurement accuracy: Provides 0.5% accuracy from 10% to 120% of rated current, supporting dependable energy and demand metering.
- Built for branch circuit monitoring: Compact, lightweight designs with 0.75", 1.25", and 2.00" window sizes make it easier to fit conductors inside electrical panels.
- Ideal for efficiency projects: Well suited for energy metering, demand metering, load surveys, LEED/green projects, and ROI or project-justification studies.
- Durable electrical construction: Epoxy-encapsulated UL94V-0 case, 600 VAC Category III rating, and 3,000 VAC withstand voltage support demanding panel environments.
- Installer-friendly wiring: Stripped and tinned 22 AWG lead wires with polarity identification simplify connection to compatible ACI power meters.
- Certified and supported: UL Recognized, CE, and RoHS2 compliant, with ACI’s five-year limited warranty for long-term confidence.
S77-Solid-Core
From
$
41.00
Product Overview
- Altitude,Max 3000 m
- Approvals UL2808, 61010-2, CSA 22.2, CE and RoHS Compliant
- Case Material Plastic Encapsulated/UL 94V-0
- Color Code White: Positive (+) Black: Negative (-)
- Connection Note Stripped and Tinned Lead Wires
- Core Type Solid
- Electrical Connection Stripped Leads
- Frequency Input Range 50/60 Hz
- Height 0.75 in
- Hole Diameter 0.77 in
- Insulation Note Impulse Insulation (BIL): 10kV; Insulation Resistance: 50 MΩ
- Lead Length 1 ft
- Length 2 in
- Measurement Type Current
- Operating Humidity 5 to 95% RH, non-condensing
- Operating Temperature, Max 140 °F
- Operating Temperature, Min 5 °F
- Output Detail Rated Output: 333mV @ 5/20/50/100 Amps (See Ordering Grid)
- Series ID S77 Solid Core
- Storage Temperature, Max 185 °F
- Storage Temperature, Min -40 °F
- Volt-Amperes Burden B0.005
- Weight 0.2 lb
- Width 0.75 in
- Wire Gauge 18 AWG
- Withstand Voltage 3,000 Vac
- Working Voltage CAT III 600 VAC
Supported Applications
The ACI S77 Solid-Core High Accuracy Current Transformers convert an AC operating current into a low voltage AC millivolt signal for use with microprocessor-based circuits. Designed as compact, lightweight solid-core units, they are intended for installation on branch circuits where exceptionally accurate signal transformation is required. The series has been approved by Measurement Canada for metering applications used in billing purposes.
These current transformers (CTs) come standard unterminated and are compatible with specific ACI power meters including the KW350-P1-D-S-SC, KW320-P1-D-W-SC-XX, KW320-P1-D-W-SC-PC, KW1850-P1-D-W, and KW1850-P1-D-S models for typical power measurements.
Operating Conditions & Performance
The S77 series monitors AC Current with a maximum working voltage of 600 VAC, Category III. The rated output is 333mV at the specified current rating (5/20/50/100 Amps or higher ranges as per ordering grid). Performance specifications include an accuracy of 0.15% Class IEC 60044-1 and a burden of 80.005.
Operating conditions are defined by the following limits:
- Frequency Range: 50/60 Hz
- Withstand Voltage: 3,000VAC
- Impulse Insulation (BIL): 10kV
- Insulation Resistance: 50 MΩ
- Operating Temperature Range: 5 to 140°F (-15 to 60°C)
- Storage Temperature Range: -40 to 185°F (-40 to 85°C)
- Humidity Range: 5 to 95%, non-condensing
- Maximum Elevation: 9,842 ft (3 Kilometers)
Configuration Options
The series is offered in a solid-core style with plastic encapsulated housing carrying a UL 94V-0 flammability rating. Electrical connections are provided via stripped and tinned lead wires.
- Wire Specifications: 18 AWG (0.75 mm²), UL 1015
- Lead Length: 1' (0.30m)
- Polarity Indication: White wire for Positive (+) and Black wire for Negative (-)
- Rated Current Options: The series supports ratings including 5, 20, 50, 100 Amps, as well as specific models for 100A and 200A.
The standard window size is 0.77" (19.70 mm). Agency approvals include UL2808, 61010-2, CSA 22.2, CE, and RoHS Compliant status. The product weight is listed as 0.2lbs (0.09kg).
Key Product Differences
The S77 series includes specific model configurations distinguished by their rated current capacity while maintaining a consistent output signal of 333mV at the respective rating.
- AcuCT-S77-100-333: Rated for 100A with an output of 333 mV @ 100A. Item number: 148212.
- AcuCT-S77-200-333: Rated for 200A with an output of 333.mV @ 200A. Item number: 148210.
The model numbering follows the pattern AcuCT-S77-<Rated Current>-333 (example: AcuCT-S77-200-333). For best accuracy, CTs should be selected based upon expected maximum and minimum currents for the targeted application as referenced in the ordering grid table.
PDFs & Manuals
