Current transformer TO-125 with openable core TO-125-5

Current Transformer – Precise Measurements and Installation Protection

The TO-125-5 current transformer is a reliable device used to measure current in electrical circuits and provide protection against overloads and short circuits. The design with an openable core facilitates mounting and dismounting without the need to interrupt the circuit, which is particularly important in existing installations. Designed for both industrial applications and public and residential buildings where measurement accuracy and high reliability are required.

Characteristics and application

The TO-125-5 transformer converts a primary current of 125A into a secondary current of 5A, enabling safe and accurate readings on measuring instruments. The FS 5 overload factor provides resistance to short-term current surges, typical during the starting of motors or other high-power devices. This protects measuring instruments and protection devices from damage. The use of a screw connection of the secondary circuit guarantees a secure and durable electrical connection.

• Current measurement: Precise measurement of current in electrical circuits.
• Protection: Protection of the installation against overloads and short circuits.
• Mounting: Easy mounting and dismounting thanks to the openable core – an ideal solution for modernization of installations.
• Versatility: Suitable for use in residential, commercial and industrial buildings.
• Safety: Ensures safe operation of measuring instruments and protection devices thanks to the FS 5 overload factor.

Technical parameters and construction

The transformer is characterized by a solid construction and high quality of workmanship. The rated secondary apparent power is 1.5 VA, which ensures stable operation of the device even under high loads. The housing with touch protection increases safety, minimizing the risk of electric shock. Panel mounting allows for easy integration with existing electrical infrastructure. The device meets the requirements of IEC 60044-1 standard, which confirms its compliance with international safety and quality standards. The operating temperature from -15°C to +50°C allows it to be used in various environmental conditions.

The transformer has the following parameters: rated primary current 125 A, rated secondary current 5 A, rated secondary apparent power 1.5 VA, overload factor FS 5 and secondary circuit connection made as a screw connection. Accuracy class has not been specified in the available source data.

The weight of the device is approximately 0.78 kg, which facilitates its transport and assembly. The dimensions of the transformer have been designed to ensure compactness and ease of integration with existing electrical switchboards (21 x 32 x 51 mm). The tightening torque of the connection screws is 0.5 Nm – this should be taken into account during assembly to ensure a correct electrical connection.