B59*** series PTC thermistors are ideal for overcurrent protection in telecom equipment. They meet ITU-T K20, K21, K45 standards, have a very narrow resistance tolerance and can be supplied with different resistances and tolerances. They are suitable for continuous connection to mains voltages of 110/230 VAC in tripped (high ohmic) condition.
The document describes the EPCOS B59*** series of PTC (Positive Temperature Coefficient) thermistors, specifically designed as leaded disks for Telecom MDF applications. These components are intended for use in overcurrent protection within switching systems and customer premises equipment.
Key features include compliance with ITU-T standards K20, K21, and K45, suitability for basic level lightning surges and power induction, and the ability to withstand power contact criteria A/B at 230 V. The thermistors are suitable for continuous connection to mains voltages of 110/230 VAC when in a tripped (high ohmic) condition.
| Compliance Standard | ITU-T K20, K21, K45 |
|---|---|
| Lightning Surge Protection | basic level lightning surges (10/700 µs) |
| Power Induction Tolerance | 600 V, 1 A, 0.2 s |
| Power Contact Criteria | A/B (230 V, 15 min.) |
| Rated Voltage DC | 60 VDC |
| Max. Switching Voltage AC | 265 VAC |
They are used for overcurrent protection in telecom equipment, including switching systems and customer premises equipment.
Yes, they are suitable for continuous connection to mains voltages of 110/230 VAC when in a tripped (high ohmic) condition.
The tolerance of R is ±20 %.