XI1I
XI1I - Time Overcurrent Relay

As an universal time overcurrent protection, the XI1-I relay of the PROFESSIONAL LINE is generally used in radial and meshed systems. Among other, it is applied as:  selective overload and short-circuit protection relay for electr. machines, lines and networks or for  load dependent connection and disconnection of consumers and electric power generators. Order Variants of the XI1I XI1I1 (1 A) – ANSI 50,51 XI1I5 (5 A) – ANSI 50,51

FEATURES & FUNCTIONALITY

Order Variants of the XI1I
XI1I1 (1 A) – ANSI 50,51
XI1I5 (5 A) – ANSI 50,51

As an universal time overcurrent protection, the XI1-I relay of the PROFESSIONAL LINE is generally used in radial and meshed systems. Among other, it is applied as:

 selective overload and short-circuit protection relay for electr. machines, lines and networks or for

 load dependent connection and disconnection of consumers and electric power generators.

It is possible to select from the following tripping characteristics:

 Definite time overcurrent protection (DMT)

 Inverse time overcurrent protection (IDMT) with selectable tripping characteristics

- Normal Inverse

- Very Inverse

- Extremely Inverse

Furthermore, the XI1-I can be employed as a back-up protection for differential and distance protection relays.

When compared to the conventional protection equipment all relays of the PROFESSIONAL LINE reflect the superiority of digital protection techniques with the following features:

 High measuring accuracy by digital data processing

 Fault indication via LEDs

 Extremely wide operating ranges of the supply voltage by universal wide-range power supply

 Very fine graded wide setting ranges

 Data exchange with process management system by serial interface adapter XRS1 which can be retrofitted

 RMS measurement

 Extremely short response time

 Compact design by SMD-technology