PolySwitch® PTC Devices PRODUCT: LR4-550F DOCUMENT: SCD25850 PCN: E74816 REV LETTER: E REV DATE: JULY 26, 2016 PAGE NO.: 1 OF 2 Overcurrent Protection Device Specification Status: Released Electrical Rating Voltage: 20V MAX Current: 100A MAX Chip Size: 7 X 23mm Leads: Nickel 1/4H 0.125mm nominal thickness Tape: Polyester (White) 24mm nominal Width Solder: Lead-free Marking: (Color: Green) Manufacturer's Mark E55 Part Identification Lot Identification TABLE I. DIMENSIONS: A B C D E F MIN 35.0 MAX 37.0 MIN 6.9 MAX 7.5 MIN 0.6 MAX 1.0 MIN 5.3 MAX 6.7 MIN 5.3 MAX 6.7 MIN 4.9 MAX 5.1 (1.38) (1.46) (0.27) (0.30) (0.02) (0.04) (0.21) (0.26) (0.21) (0.26) (0.19) (0.20) mm: in*: *Rounded off approximation TABLE II. PERFORMANCE RATINGS: As measured in Mueller Kelvin Clips model BU-75K. I HOLD CURRENT TRIP LIMITS TIME TO TRIP REFERENC ONE-HOUR TRIPPEDE POST-TRIP STATE RESISTANC RESISTANCE POWER E DISSIPATION AMPS AMPS AMPS AMPS AMPS SECONDS OHMS OHMS WATTS AT 20°C AT 0°C AT 20°C AT 60°C AT --°C AT AT 20°C AT 20°C 20°C, 20V 20°C,27.5A HOLD HOLD TRIP HOLD TRIP HOLD TRIP HOLD TRIP TYP MAX MIN MAX MIN MAX TYP MAX 5.5 6.2 12.0 5.5 10.5 4.0 7.8 ------5 0.009 0.016 0.009 0.022 --2.8 Agency Recognitions: UL, TUV, CSA Reference Documents: PS300 Precedence: This specification takes precedence over documents referenced herein. Effectivity: Reference documents shall be the issue in effect on the date of invitation for bid. CAUTION: Operation beyond the rated voltage or current may result in rupture, electrical arcing or flame. Materials Information: ROHS Compliant © 2016 Littelfuse, Inc. Specifications are subject to change without notice. Revised July 26, 2016 ELV Compliant Pb-Free littelfuse.com PolySwitch® PTC Devices Overcurrent Protection Device PRODUCT: LR4-550F DOCUMENT: SCD25850 PCN: E74816 REV LETTER: E REV DATE: JULY 26, 2016 PAGE NO.: 2 OF 2 Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, lifesaving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. © 2016 Littelfuse, Inc. Specifications are subject to change without notice. Revised July 26, 2016 littelfuse.com