Current Transformers (CT Series) TOROIDAL CT APPLICATION DATA To obtain current measurement: • Pass the wire carrying the current to be measured through the window of the C.T. transformer (acting as a primary winding). • Connect the C.T. secondary to an ammeter with a 5 A movement. For higher accuracy or higher VA burden rating: • Choose a C.T. with a primary which is a multiple of the required primary rating and which has the accuracy or VA burden you require. • Loop the wire carrying the current to be measured through the window a number of times equal to the multiple. This "winding" will reduce the ratio back to required primary rating. • Example "A": To obtain an accuracy of 1.2% at 10VA burden with a ratio of 100:5, use a C.T.400 and loop 4 primary turns through the window. • Example "B": To obtain a 25:5 ratio, use a C.T.75 with 3 primary turns to yield 2% accuracy or a C.T.50 with 2 primary turns to yield 3.2% accuracy. SMALL CURRENT TRANSFORMERS • Designed for a 5 amp. primary (maximum 20 Amp), secondary current 5 ma. • 40 - 1,000 Hz. operation. • Customer to supply primary winding (1 turn through open top of transformer bobbin). • Two hole chassis mount or P.C. board pin mount. • Both units have 5 ma. secondary for use with standard AC ammeters with 5 ma.movements. • High accuracy windings (1%). Part No. Mounting CT5CF CT5PC Chassis P.C. Board Overall Dimensions (Inches) H D W 1.25 1.10 2.063 1.40 1.08 1.03 Mtg. Hole (Inches) Ship Wt. oz. 0.187 n/a 2.6 1.8 APPLICATION DATA Instrument To obtain current measurement: 1.Pass the wire carrying the current to be measured through the window of the current transformer (acting as a primary winding). 2.Connect the secondary to an ammeter with a 5 mA movement. EUROPE Basingstoke, UK 01256 812812 AUSTRALIA Queenstown, Australia 61-8-8240-2244 CANADA www.hammondmfg.com Guelph, Ontario (519) 822-2960 St. Laurent, Quebec (514) 343-9010 109 Cheektowaga, NY (716) 630-7030 USA ©