ZHT103 5A/5mA CT103 Precision Miniature Current Transformer

ZHT103 5A/5mA CT103 Precision Miniature Current Transformer is a compact current sensing transformer designed for precise AC current measurement in control and monitoring circuits. It steps down a 5A primary current to a 5mA output signal, enabling safe and isolated current sensing for metering, protection, and automation systems.

Key Features:

• High Accuracy: Designed for precision current measurement with minimal phase error.
• Compact Size: Miniature form factor fits in tight spaces or high-density PCB layouts.
• Electrical Isolation: Galvanic isolation between primary and secondary circuits.
• Low Burden Resistance: Compatible with standard measuring instruments.
• Wide Operating Range: Ideal for low- to medium-current sensing applications.

Technical Specifications:

• Primary Current: 5A RMS
• Secondary Output: 5mA RMS
• Turns Ratio: 1000:1
• Accuracy Class: Class 1.0
• Working Frequency: 50Hz to 60Hz
• Dielectric Strength: ≥ 2.5kV between windings
• Burden Resistor: Up to 100Ω recommended

Mechanical Specifications:

• Mounting Style: Through-hole or PCB pin
• Body Material: Flame-retardant plastic
• Dimensions: Approx. 14mm × 18mm × 16mm
• Weight: Approx. 5g
• Wire Aperture: Accepts solid or stranded conductor up to 2.5mm²

Connection and Wiring:

• Primary: Pass the load-carrying conductor through the core opening
• Secondary: Connect to burden resistor or measuring circuit
• Polarity: Follow markings for phase alignment

Schematic Diagram, Wiring and Pinout:

• Transformer Type: Passive current transformer
• Terminals: 2-pin secondary coil output
• Application: Series connection with current path, secondary to measuring input

Datasheet and Documentation:

• Download ZHT103 Datasheet (PDF)

Applications:

• Energy Meters: Accurate current sensing for home and industrial metering
• Motor Protection: Detect overcurrent conditions in industrial drives
• Power Monitoring Units: Used in smart distribution and power quality analyzers
• Relay Circuits: Input signal for trip or alarm generation
• Instrumentation: Safe isolation and measurement in test setups

Equivalent Models:

• ZMCT103C: Similar 5A/5mA miniature current transformer
• Talema AC1050: High-accuracy current sensor for similar loads
• YHDC SCT-005: PCB mountable compact current transformer

Package Includes:

• 1 x ZHT103 5A/5mA Current Transformer