SE-CS40 Series - Current Transformer

Roll Over to Zoom
The SE-CS10 series is a current transformer used with Littelfuse relays to detect earth leakage current.

Access specifications, certifications, check availability and order parts below

Catalog #CT-Secondary Rating (A)
To request product environmental information, please complete the Product Environmental Information Request Form.

pdf icon SE-CS40 Datasheet

pdf icon CT Selection Guide

The Current Transformer (CT) Selection Guide provides assistance in selecting the appropriate CT for each protection relay.

pdf icon TN CT-03 Locating Phase Conductors in a Zero-CT Window

An ideal window-type current transformer responds only to the sum of the currents fl owing through its window...

pdf icon TN CT-04 Hammond CTs

pdf icon TN CT-06 CT Turns Ratio Modification

A window-type current transformer is also referred to as a core-balance or fl ux-balance transformer...

pdf icon TN CT-08 Ground-Fault Current Transformer Location

A ground fault on a grounded system can be detected using a current-sensitive ground-fault monitor...

pdf icon TN CT-09 Sensitive Ground-Fault Protection Using Split-Core CTs

A zero-sequence CT is optimized by using a symmetrical core and windings that are evenly spaced around the core. The symmetry allows the CT to operate in the presence of high load currents...

pdf icon TN CT-10 CT and PT Polarity Testing

Correct operation of MPS and FPS relays depends on accurate polarity. Markings on current transformers (CT) and potential transformers (PT) have been occasionally misapplied from the factory...

pdf icon TN CT-11 FPL Zero-Sequence Sensors with Littelfuse Relays