This document describes the application of PTC thermistors for overcurrent protection in telecom equipment, including compliance with ITU-T K20, K21, K45 standards.
This document is a technical datasheet for EPCOS Telecom B59*** series PTC (Positive Temperature Coefficient) thermistors designed for use in MDF (Main Distribution Frame) applications. The components are leaded disks intended for overcurrent protection in telecom equipment, such as switching systems and customer premises equipment.
The datasheet details the product's compliance with ITU-T standards K20, K21, and K45 regarding lightning surges and power induction. It provides specific electrical specifications, dimensional drawings for both kinked and straight lead options, and a list of ordering codes corresponding to various resistance values and matched pairs.
| Rated voltage VR | 60 VDC |
|---|---|
| Max. switching voltage Vemax | 265 VAC |
| Tolerance of Ra ARR | +/- 20 % |
| Operating temperature range (Vv =0) | - 25/+125 °C |
| Operating temperature range (V=230V) | 0/+60 °C |
The rated voltage is 60 VDC.
The maximum switching voltage is 265 VAC.
The operating temperature range is 0 to +60 °C.