The TTB relays of the 7000 series form a complete range of instantaneous DC over or under voltage relays.
The relay is supplied in a modular plug-in case type R1, which may be mounted either as a separate relay, projecting or flush mounting, or as an element in a standard 19" rack cradle.

The TTB 7000 series is made up of:

• TTB 7011: 1 over voltage pick-up level
• TTB 7013: 1 under voltage pick-up level
• TTB 7025: 1 over voltage + 1 under voltage pick-up levels
• TTB 7026: 2 under voltage pick-up levels

PROTECTION   FUNCTIONS

• DC under voltage [27DC]
• DC over voltage [59DC]

MAIN   FEATURES

• Setting ranges:
  TTB 7011: 100÷120 % Un
  TTB 7013: 80÷100 % Un
  TTB 7025 / 7026: see leaflet n.1720
• n.2 output units (2 NO, 2 NC, or 1NO + 1NC for each unit)
• Hand reset mechanical operation indicator