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 Current Rating Accuracy Frequency Insulation Level Operating Temperature Application Certification Compliance Ordering Information WINDOW SIZE, ID WEIGHT EFCT-26 26 mm (1.0”) 0.4 kg (1 lb) EFCT-1 82 mm (3.2”) 0.9 kg (2 lb) EFCT-2 139 mm (5.5”) 2.7 kg (6 lb) Note: 1 Frequency response may be extended for specific product families. 5.0 SECONDARY EXCITING VOLTAGE (VOLTS) ORDERING NUMBER 100:1 5:0.05 A 3% @ 0.01 VA 50 to 400 Hz1 0 to 6 kHz for EL731 600 V -55 to 60ºC (-67 to 140ºF) EL731, FPU-32, FPS, MPU-32, MPS, SE-330, SE-701, SE-703 CSA, UL, CE RoHS, IEC 60044-1 1.0 0.1 0.01 0.1 50.0 10.0 1.0 SECONDARY EXCITING CURRENT (MILLIAMPERES) EFCT-1 EFCT-2 EFCT-26 © 2015 Littelfuse Protection Relays & Controls www.littelfuse.com/efct Rev: 1-A-111215 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 (4.76) 121.0 (4.76) 20.5 (0.81) 56.0 (2.21) 46.0 (1.81) 30.0 (1.18) 80.0 (3.15) NOTE 2 M5 SCREWS TOP MOUNTING DETAIL 25.0 (0.98) 30.0 (1.18) E F C T- 1 E A RT H FAU LT C T 600 V CLASS, INSULATION CLASS A R R LR 53428 5.0 (0.20) Ø RECESSED FOR 8-mm HEX NUT 1.0 (0.04) DEEP 22.0 (0.87) EFCT - 1FC FLUX CONDITIONER (OPTIONAL) .0 82 23) . (3 69 (2.7 .8 5) 126.0 (4.96) US (5.43) 138.0 MAX C 5.5 (0.22) 110.0 (4.33) FRONT © 2015 Littelfuse Protection Relays & Controls www.littelfuse.com/efct 5.5 (0.22) 56.0 (2.21) SIDE Rev: 1-A-111215 Accessories Current Transformers EFCT SERIES Dimensions and Mounting Diagram EFCT-2 NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. MOUNTING SCREWS: M5 OR 10-32. 3. RoHS COMPLIANT. 4. EN 60044-1 COMPLIANT. 215.0 (8.46) 26.5 (1.04) 52.3 (2.06) P S1 2S2 P1 31.0 (1.22) 64.0 (2.52) 215.0 (8.46) 162.0 (6.38) M5 OR 10-32 TAP M5 SCREWS TOP MOUNTING DETAIL 31.0 (1.22) 25.0 (0.98) EFCT-2 EARTH FAULT CT 600 V CLASS, INSULATION CLASS A R LR 53428 R 139.7 (5.50) FLUX CONDITIONER (INCLUDED) BONDING SCREW 215.0 (8.46) US 5.0 (0.20) DIA 60.0 (2.36) 236 MAX (9.29) C 8.5 (0.33) 198.0 (7.80) FRONT © 2015 Littelfuse Protection Relays & Controls www.littelfuse.com/efct 8.5 (0.33) SIDE Rev: 1-A-111215 Accessories Current Transformers EFCT SERIES Dimensions and Mounting Diagram EFCT-26 68.0 (2.68) 68.0 (2.68) 17.0 (0.67) P S1 2 S2 P1 M4 OR 8-32 TAP 42.6 (1.68) 52.5 (2.07) 26.5 (1.04) 34.0 (1.34) M5 SCREWS 110.0 MAX (0.43) TOP MOUNTING DETAIL 26.5 (1.04) 25.0 (0.98) E F C T- 2 6 E A RT H FAU LT C T 600 V CLASS, INSULATION CLASS A R R C LR 53428 US 72.0 (2.83) 4.0 (0.16) Ø RECESSED FOR 7-mm HEX NUT 3.0 (0.12) DEEP 7.0 (0.87) 34.0 (1.34) .0 26 2) 0 (1. 58.0 (2.28) 52.5 (2.07) 5.0 (0.20) 5.0 (0.20) FRONT SIDE NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 2. MOUNTING SCREWS: M4 OR 8-32. MOUNTING FOOT INSTALLATION TOOL DETAIL ‘A’ 3. PRESS MOUNTING FEET IN PLACE USING INSTALLATION TOOL PROVIDED. (DETAIL ‘A’) 4. RoHS COMPLIANT. 5. EN 60044-1 COMPLIANT. 6. NOT ALL CERTIFICATIONS SHOWN. © 2015 Littelfuse Protection Relays & Controls www.littelfuse.com/efct Rev: 1-A-111215