Zeigler Current Transformer (100/5A)

This device is an industrial Zeigler window type (ring type) current transformer (CT) designed for power monitoring, system protection, and electrical metering applications.

With a transformation ratio of 100/5A, this transformer safely scales down a primary line current of up to 100A passing through its central window into a proportional 5A secondary output. This step down process allows standard instruments such as digital power meters, analog ammeters, and protection relays to safely measure and monitor high current circuits.

Key Features

Proportional Step Down Performance: Safely reduces heavy current loads down to a standard 5A secondary output, ensuring compatibility with standard industrial metering instrumentation.
Contoured Pass Through Window: Features an integrated internal window opening that accommodates standard copper busbars or heavy insulated power cables.
Safety Terminal Protective Covers: Equipped with blue, flip up clip on protective covers over the secondary screw terminals. These covers provide a finger safe barrier that protects personnel from accidental contact with voltage potentials during maintenance.
Standard Circuit Nomenclature: Explicitly stamped with clear engineering markers to aid installation. The primary side face is marked P2, while the secondary connection terminals are designated as S1 and S2 to ensure proper phase alignment.
Durable Polymer Housing: Molded from a flame retardant, high impact light grey thermoplastic casing built to withstand thermal and mechanical stresses inside switchgear rooms and panel boards.

Technical Specifications

Feature	Specification
Product Type	Window Type / Ring Core Current Transformer
Brand / Manufacturer	Zeigler / Zeigler Instruments
Primary Rated Current $I_{pn}$	100 A
Secondary Rated Current $I_{sn}$	5 A
Transformation Ratio	100:5
Terminal Identifiers	Primary Face: P2 \| Secondary Terminals: S1 and S2
Rated Network Frequency	50 / 60 Hz operating grids
Insulation Voltage Class	0.72 kV continuous insulation max / 3 kV dielectric rating
Mounting Capability	Directly onto busbar / surface plate mount base pathways
Compliance Approvals	CE Compliant, IEC 61869-2 standard specifications

Applications

Sub Panel Power Metering: Installed inside electrical distribution boards to monitor smaller sub circuits and feed real time current telemetry into digital multi meters or building management systems.
Motor Overload Protection: Measures operational current on medium sized industrial motors, feeding telemetry into protection relays to trip circuits in the event of an overload or stalled rotor.
Energy Management Systems (EMS): Deployed across factory floors to gather granular sub metering data for tracking energy usage patterns.
Control and Protection Relays: Interfaces with overcurrent, earth fault, and phase imbalance safety switches to trigger circuit breaker shunts if current exceeds safe parameters.