Current transformer 300/5A class 0.5

The current transformer with an openable core OSCTK-35 300/5A is a precise measuring device of class 0.5, designed for the proportional transformation of current from 300 A to a standard value of 5 A, suitable for the measurement ranges of energy meters, network analyzers, and SCADA systems. The OSCTK-35 series with a 35 mm opening is intended for installation with large cross-section cables and busbars.

The OSCTK-35 300/5A provides an accuracy class of 0.5 and an apparent power of 2.5 VA, ensuring accurate measurements that support energy billing and monitoring of energy installations. A measuring cable 2x0.51 mm² with a length of 200 cm is included. The claw construction of the core allows installation without breaking the circuit, and voltage resistance up to 4000 V ensures safe operation in category CAT III.

Technical Data

• Ratio: 300/5A
• Accuracy Class: 0.5
• Apparent Power: 2.5 VA
• Housing: OSCTK-35, hole diameter 35 mm
• Operating Voltage: ≤0.72 kV
• Rated Input: 1-800 A
• Rated Output: 5A/1A/mA/mV
• Frequency: 50 Hz-60 Hz
• Operating Temperature: -25°C to +75°C
• Relative Humidity: <90% at 40°C
• Withstanding Voltage: 4000 V/1 mA/1 min (50 Hz)
• Protection Category: CAT III
• Connection S1/S2: 2x0.51 mm², L=200 cm
• Insulation Resistance: ≥1 MΩ @ DC 500 V
• Weight: 0.33 kg
• Standards: IEC/EN 60044-1

Applications

• Current measurement in medium and large industrial object switchboards
• Cooperation with energy meters, network analyzers, and SCADA devices
• Installations with large cross-section cables and busbars

Installation

• Openable claw core - hole diameter 35 mm
• No need to dismantle the busbar
• Dimensions of OSCTK-35: width 58 mm, depth 68 mm, height 68 mm