Current transformer 300/5A class 0.5

The current transformer with an opening core OSCTK-25 300/5A is a precision measuring device class 0.5, designed for the proportional conversion of current intensity from 300 A to the standard value of 5 A, suitable for energy meter measurements, network analyzers, and automation systems. The clamped design of the OSCTK-25 casing with a 25 mm opening allows for installation without breaking the electric circuit.

The OSCTK-25 300/5A transformer ensures an accuracy class of 0.5 and an apparent power of 2.5 VA. The improved magnetic core with low losses guarantees stable operation over a wide temperature range. A measuring cable of 2x0.51 mm² and 200 cm long is included. Compact dimensions and a weight of 0.2 kg are suitable for crowded distribution boards with higher rated currents.

Technical Data

• Ratio: 300/5A
• Accuracy Class: 0.5
• Apparent Power: 2.5 VA
• Housing: OSCTK-25, hole diameter 25 mm
• Operating Voltage: ≤0.72 kV
• Nominal Input: 1-800 A
• Nominal 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: 0.2 kg
• Standards: IEC/EN 60044-1

Applications

• Current measurement in power installations with higher rated currents
• Collaboration with energy meters, network analyzers, and protective relays
• Distribution boards and control cabinets in industrial facilities

Installation

• Openable clamped core - installation without breaking the circuit
• No need to disassemble the busbar
• Dimensions of OSCTK-25: width 48 mm, depth 55.5 mm, height 65.5 mm