ZXY-CT226A Precision AC Current Transformer, 30 A Input, 1000:1 / 2000:1, Φ5 mm Through-Hole Primary, PCB Mount, 19 x 18 x 10.2 mm

1. Product Name

ZXY-CT226A precision AC current transformer, series GL-CT226AB, 30 A AC rated input, 1000:1 and 2000:1 builds, PCB mount. Epoxy-potted case with a Φ5 mm primary through-hole and two secondary pins, body 19 mm high by 18 mm wide by 10.2 mm deep.

Package. The six views are of the same moulding: an arched body with the bore through the flat faces, a flange at the base and two pins under it. There is no adjustable part and no terminal block - the outline is the whole mechanical interface, which is what makes the 0.5 mm dimension tolerance the only tolerance a footprint has to absorb.

The arched section is the core window seen end-on. The core is a ring, and the bore through the middle is the primary: the conductor passes through the opening, so the primary is one turn of whatever cable is threaded, and the secondary carries the many turns that step the current down.

2. Feature

Through-hole primary. The conductor under measurement passes through the Φ5 mm centre hole and the secondary winding is brought out to two PCB pins, so the part is never wired into the circuit it reads.

30 A AC rated input. Rated at 30 A AC on a 50/60 Hz supply, which covers a mains branch or a motor line without a shunt in the path.

Two ratios from one body. 1000:1 for 30 mA AC output and 2000:1 for 15 mA AC output, so a metering input can be matched to the resolution it needs.

Phase error of 5 arc-minutes or better. Held at the burden the specification states for each build, which is what makes the part usable for power measurement and not only for presence detection.

Linearity 0.2% and 0.1%. The 2000:1 build is the tighter of the two, and both figures are quoted at 25 °C over the linearity range in the table.

The series card puts the three figures that sell the part side by side: 0.1% linearity error, 5 arc-minutes of phase error, 30 A AC rated input, with both ratios available. Read the linearity figure with the table: 0.1% is the 2000:1 build, the 1000:1 build is specified at 0.2%, and 0.1% is otherwise the accuracy class printed on the case.

3. Advantage

Epoxy encapsulation. The core and winding are potted in epoxy resin, which seals them against moisture and holds the assembly mechanically as well as electrically.

Flame-retardant case. The housing conforms to UL94-V0, which is the grade a mains-side component is normally asked to meet.

Insulation resistance above 1000 MΩ. Measured under normal conditions, and backed by a 4 kV dielectric withstand at 50 Hz for 1 minute.

Compact PCB-mount body. 19 mm by 18 mm by 10.2 mm with 12.0 mm pin spacing, so it stands on the board rather than beside it on a terminal block.

Tolerance held to 0.5 mm. The outline carries a 0.5 mm dimension tolerance, which is what a moulded part needs to be placed reliably by machine.

Customised designs. Other ratios and burdens can be built on request where the two standard builds do not fit.

The two callout views show the same part before and after potting: the matte moulding on the left, the cured epoxy filling the window on the right, with the two secondary pins the only metal leaving the body. The dimensioned panels underneath give the same 19 mm, 18 mm, 10.2 mm and Φ5 mm as the outline drawing, and the two build cards repeat the 46 ± 8 Ω and 147 ± 15 Ω DC resistance that separates them.

4. Application

AC current measurement and monitoring in power supplies. The supply's own output current is read without breaking the conductor.

Energy meters and power measurement circuits. The phase error and linearity are the two figures that decide whether a measurement-grade part is good enough here.

Motor and load current sensing. 30 A AC rated input and a 0-60 A AC linearity range on the 2000:1 build, so a start-up surge stays inside the linear band.

Protection, control and instrumentation equipment. An isolated scaled copy of the current is what a protection relay or a control input is designed to accept.

The first view shows the part in its two working positions at once: one unit with the primary conductor threaded through the bore and nothing else attached to it, one already seated on its two pins. The second places it on an AC measurement board, where the secondary goes straight into the burden and the signal conditioning beside it.

5. Application Specifications

The specification below is the data declared for this series at 25 °C: product data, the electrical table per build, the outline and mechanical data, and the terminal assignment with its operating rule.

5.1 Product specification

5.2 Electrical specification, two builds, 25 °C

Both builds are rated 30 A AC input at 50/60 Hz and share the voltage class, the dielectric withstand and the temperature range. They differ in ratio, output current, phase-error burden, linearity range, linearity, DC resistance and net weight.

5.3 Outline and mechanical data

5.4 Terminals and connection

The primary current enters at P1 and returns at P2; the secondary current leaves at S1 and returns at S2. P1 and P2 are the ends of the conductor threaded through the bore, not pins on the part - the only metal terminals on the body are the two secondary pins.

6. Quality & Testing Assurance

All parameters are specified at 25 °C ambient. The test items are the rated input and output current, the turns ratio, the phase error, the linearity, the DC resistance and the dielectric withstand.

The dielectric test is 4 kV at 50 Hz held for 1 minute, and the operating temperature range is −40 °C to +70 °C. Insulation resistance is above 1000 MΩ under normal conditions, which is the figure the potted construction exists to hold.

Brand / manufacturer: ZXY, Shenzhen Zhixiangyuan Electronics Co., Ltd. http://www.zxycoil.com