Accessories Current Transformers EFCT SERIES Current Sensor Description The EFCT series is a sensitive nickel-core current transformer used with Littelfuse relays to detect low levels of earth-leakage current. Accessories EFCT-1FC Flux Conditioner used with the EFCT-1 to reduce saturation and prevent false operation due to large surge currents. Specifications Turns Ratio 100:1 Current Rating 5:0.05 A Accuracy 3% 0.01 VA 1 Frequency 50 to 400 Hz 0 to 6 kHz for EL731 Insulation Level 600 V Operating Temperature -55 to 60C (-67 to 140F) Application EL731, FPU-32, FPS, MPU-32, MPS, SE-330, SE-701, SE-703 Ordering Information Certification CSA, UL, CE Compliance RoHS, IEC 60044-1 Note: 1 Frequency response may be extended for specific product families. ORDERING NUMBER WINDOW SIZE, ID WEIGHT EFCT-26 26 mm (1.0) 0.4 kg (1 lb) 5.0 EFCT-1 82 mm (3.2) 0.9 kg (2 lb) EFCT-2 139 mm (5.5) 2.7 kg (6 lb) 1.0 0.1 0.01 0.1 1.0 10.0 50.0 SECONDARY EXCITING CURRENT (MILLIAMPERES) EFCT-1 EFCT-2 EFCT-26 2015 Littelfuse Protection Relays & Controls Rev: 1-A-111215 www.littelfuse.com/efct SECONDARY EXCITING VOLTAGE (VOLTS)69.8 (2.75) Accessories Current Transformers EFCT SERIES Dimensions and Mounting Diagram EFCT-1 NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. MOUNTING SCREWS: M4 OR 8-32. 3. PRESS MOUNTING FEET IN PLACE USING INSTALLATION TOOL PROVIDED. 4. RoHS COMPLIANT. 5. EN 60044-1 COMPLIANT. 121.0 121.0 (4.76) (4.76) 20.5 80.0 (3.15) (0.81) NOTE 2 M5 SCREWS TOP MOUNTING DETAIL 25.0 30.0 (0.98) (1.18) EFCT-1 EARTH FAULT CT 600 V CLASS, INSULATION CLASS A R R LR 53428 C US 5.0 (0.20) EFCT - 1FC RECESSED FOR FLUX CONDITIONER 8-mm HEX NUT (OPTIONAL) 1.0 (0.04) DEEP 5.5 110.0 5.5 56.0 (4.33) (2.21) (0.22) (0.22) FRONT SIDE 2015 Littelfuse Protection Relays & Controls Rev: 1-A-111215 www.littelfuse.com/efct 82.0 (3.23) 138.0 MAX 30.0 (1.18) (5.43) 22.0 (0.87) 56.0 (2.21) 46.0 (1.81) 126.0 (4.96)