Used primarily in a step down environment to monitor voltage. They are designed for connection line-to-line or line-to-neutral in the same manner as ordinary voltmeters. The secondary voltage bears a fixed relation with the primary voltage so that any change in potential in the primary circuit will be accurately reflected in the meters or other devices connected across the secondary terminals.

Potential transformers can be used with voltmeters for voltage measurements or they can be used in combination with current transformers for watt-meter or watt-hour meter measurements. They are used also to operate protective relays and devices, and for many other applications, Since they are used in a monitoring capacity, they generally require much greater accuracy in design. |

For measuring 50-400HZ currents in bus bar and other large conductor systems. Typical configuration is 400A to 12000A primary current with secondary of 1A or 5A (special secondary currents are also available).

Inside areas as small as 3.00" X 7.00" and as large as 7.00" X 27.00" and 10.00" X 24.00". All models are available with optional mounting plates for "bulk-head" mounting. Some models are U.L. recognized devices.

This type of current transformer is available to measure AC currents from 100A to 600A, at 50 to 400HZ. They are very popular in sub-metering applications where existing systems are being upgraded and it is impractical to isolate the primary conductor. It is even possible to install this type of transformer while the conductor is energized, however it is paramount that certain safety precautions be followed under such conditions. Rectangular in shape, standard split-core models are available with window dimensions up to 4.00" X 7.50". Even larger, custom designed sizes are available by special order. Secondary ratings of 5A, 1A, and 100ma are all common in split-core current transformers.

Two model groups are available, SP and SPS. The former is provided with a stainless steel screw-clamp band securing the two core halves; the latter has a UV resistant nylon band. All ratios are available in either type. Electrical and magnetic performance is identical for the two groups.

These are constructed using one of the following methods: Plastic casing, Resin casted, Resin dipped, Tape insulated,. Typical turns ratio: 4000 : 1 to 500 : 1 and Accuracy: Class 0.1 to Class 1.0. Applications include:

• Protection relays/Relay panels
• Earth fault protection
• Bussing type, oil-immersed CT in power transformer
• Control panes and switch boards
• Air/Gas circuit breakers
• Motor control cubicles
• Power control centers
• Bus bar protection systems
• Differential protection systems

These offer a small footprint for the design engineer looking to sensor current on board. They can also be used for Metering Class (Burden from B O.1 to B 1.8 with accuracy class from 0.3 to 2.4 as per customer requirement. (As per ANSI C 57.13 and IEC 185) and for Relay Class Burden from B 1.0 to B 4.0 and relay voltage class from C 10 to C 400 or T200 as per customer requirement. (As per ANSI C 57.13 and IEC 185) Secondary current range from 0.1 to 5 amp. Typical constructions are plastic casing or resin molded. Applications include:

• Sensing current overload
• Ground fault detection
• Metering

These are used for measuring high frequency primary currents up to 15 Amps with primary to secondary isolated to 2500 VAC and have optimum performance over designated current and frequency ranges. Applications include:

• Isolated current feed-back signal in switch mode power supplies
• Motor current load/overload
• Lighting
• Switch controls
• Ultra-sound current
• High resolution sonar current
• Isolated bi-directional current sensor with full wave bridge