Current Transformer FF TI-40-5 40/5 A class 0.5 1 VA 87.5x104 mm

FF TI-40-5 is a precision current transformer with a 40/5 A ratio, accuracy class 0.5 and a rated burden of 1 VA. The device is intended for measuring and monitoring alternating current in electrical installations and is built for compact panel or switchgear mounting with overall dimensions of 87.5x104 mm. It is suitable for integration into metering circuits, protection schemes and energy monitoring systems in industrial and commercial environments.

Advantages

The transformer delivers class 0.5 accuracy for reliable measurement results and low measurement error under rated conditions. With a rated burden of 1 VA the unit minimises loading on connected measuring instruments, helping to maintain accuracy. The compact physical size allows installation in confined panel spaces and standard switchgear arrangements. The robust construction and clear specification of ratio and burden simplify selection and commissioning in metering and protection applications.

Suitable for

• Primary and secondary metering in commercial electrical panels
• Current monitoring for energy management systems
• Input for protection relays and control equipment
• Industrial switchgear and distribution boards

Key specifications

• Nominal ratio: 40/5 A
• Accuracy class: 0.5
• Rated burden: 1 VA
• Applicable current type: alternating current (AC)
• Overall dimensions: 87.5 x 104 mm (footprint for panel mounting)
• Mounting: panel or switchgear installation

How to use

Install the transformer in the panel or switchgear at a location that provides secure mechanical support and access to the primary conductor. Ensure the primary conductor passes through the transformer window and that the secondary terminals are wired to the measuring device or protection relay following polarity markings. Verify the rated ratio and burden match the connected instruments, and tighten terminal connections to the specified torque. After installation, perform an instrument zero check and compare readings against a reference meter to confirm correct operation.

Usage recommendations

Use the transformer within its specified current range and burden rating to maintain class 0.5 accuracy. Avoid exposing the unit to excessive mechanical stress, moisture or corrosive environments. For protection circuits, confirm relay settings and CT polarity before energising. When replacing or upgrading measuring devices, re-evaluate burden and instrument input impedance to preserve measurement performance.