Current transformer 100/5A ESS

ESS TTN-30 100/5 A current transformer

⚡ The ESS TTN-30 100/5 A is a measuring current transformer used to connect electricity meters, ammeters and monitoring equipment to circuits carrying currents up to 100 A.

It converts the primary current into a standard 5 A secondary measuring current.

🔢 Meaning of 100/5 A

• 100 A — rated primary current;
• 5 A — rated secondary current;
• transformation ratio — 20:1.

Meter readings must be multiplied by 20 when the ratio is not programmed into the meter or monitoring system.

🎯 Accuracy and burden

• accuracy class — 0.5;
• rated burden — 5 VA;
• frequency — 50 Hz.

🏭 Applications

• three-phase electricity meters with 5 A inputs;
• electrical switchboards;
• industrial installations;
• AMR systems;
• ammeters;
• measuring relays;
• commercial and technical energy metering.

🔌 Three-phase metering

A three-phase metering installation normally requires three current transformers, one for each phase.

🛡️ Critical safety rule

Never open the S1–S2 secondary circuit while current is flowing through the primary conductor.

Before disconnecting a meter or measuring instrument, the secondary circuit must be short-circuited through a suitable test terminal block.

✅ Key advantages

• converts 100 A to a standard 5 A output;
• 20:1 transformation ratio;
• accuracy class 0.5;
• 5 VA rated burden;
• 50 Hz operation;
• compatible with 5 A electricity meters;
• compact panel installation;
• ESS Electrical Solutions brand.

⚠️ Important: confirm whether the supplied unit is class 0.5 or 0.5S, together with its aperture size, busbar design and verification documents.