Current transformer 400/5 A, class 0.5

Current transformer 400/5 A, class 0.5. It steps the feeder's current down to 5 A so a standard CT-operated meter can measure it safely. The solid-core design is the accurate, low-cost choice for new panels or planned shutdowns.

Key features

• Ratio: 400/5 A
• Accuracy class: 0.5 (suitable for billing-grade sub-metering)
• Burden: 5 VA
• Construction: solid-core, busbar/cable

Choosing the right CT

• Use this CT on feeders whose normal load is about 200–400 A. Below about 10% of the rating, accuracy falls.
• Check the window (opening) size against the cable or busbar before ordering; tell us the cable size and we will confirm.
• Order three per three-phase meter, all of the same ratio.

Installation

• Fit with the P1 side towards the supply. Wire secondaries through shorting terminals.
• Never open a CT secondary while current flows in the primary: short it first. The voltage that appears can injure and destroy the CT.
• Set the same ratio in the meter, or every kW reading will be wrong by the same factor.

Connecting to Plantmargin

The CT feeds a CT-operated energy meter; Plantmargin reads the meter. Order them together and we configure the ratio before delivery.

Warranty and support

• Manufacturer's warranty, usually 12–24 months from delivery; the exact period is stated on your quotation.
• Supplied with the datasheet and manual; calibration or test certificate where the product has one.
• Installation, commissioning and connection to Plantmargin can be quoted with the product.