Current transformer 250/5A class 0.5

The current transformer with an opening core OSCTK-35 250/5A is a precision measuring device of class 0.5, designed to proportionally convert a current of 250 A to a standard value of 5 A, suitable for the measurement ranges of energy meters, network analyzers, and SCADA systems. The larger core of the OSCTK-35 series with a 35 mm opening allows for installation on thicker cables and busbars.

The OSCTK-35 250/5A transformer is equipped with an improved low-loss magnetic core, ensuring an accuracy class of 0.5 and an apparent power of 2.5 VA. A measurement cable of 2x0.51 mm² and 200 cm in length is included. The clamped core design enables installation without interrupting the circuit or disassembling the busbars. The OSCTK-35 housing weighs 0.33 kg and is resistant to a wide temperature range.

Technical Data

• Ratio: 250/5A
• Accuracy Class: 0.5
• Apparent Power: 2.5 VA
• Housing: OSCTK-35, opening diameter 35 mm
• Operational 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
• Withstand 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

Application

• Current measurement in switchboards and control cabinets
• Collaboration with energy meters, network analyzers, and SCADA systems
• Industrial installations with thicker cables and busbars

Installation

• Opening clamp core - opening diameter 35 mm
• No need to disassemble the busbar
• Dimensions of OSCTK-35: width 58 mm, depth 68 mm, height 68 mm