Product Description
Siemens Sirius 3RT2126-4DB1 3 pole IEC rated separate mount thermal overload relay that is adjustable from 20 to 25 AMPS. Unit has class 10 tripping (trips in under 10 seconds or less), screw terminals, Manual or Automatic reset, 1 N.O. and 1 N.C. auxiliary and mounts to either DIN rail or can be screwed to base of panel
3RU2126-4DB1 technical information
The 3RU2126 thermal overload relays up to 100 A are designed for current-dependent protection of applications with normal start-up conditions against impermissibly high rises in temperature as a result of overload or phase failure. An overload or phase failure causes the motor current to rise above the set rated motor current. This current rise heats up the bimetal strips within the relay via heating elements which, in turn, operate the auxiliary contacts via a tripping mechanism due to their deflection. These switch the load off via a contactor. The switch-off time is dependent on the ratio of tripping current to operational current Ie and is stored in the form of a tripping characteristic with long-term stability.
The "Tripping" state is signaled by means of a switching position indicator. Resetting takes place manually or automatically after a recovery time has elapsed.
The 3RU thermal overload relays are electrically and mechanically optimized to the 3RT contactors such that, in addition to individual mounting, they can also be directly mounted onto the contactors to save space. The main and auxiliary circuits can be connected in various ways, including the use of Cage Clamp terminals. When the overload relay has been connected, it can be tested for correct functioning using a TEST slide. In addition to the TEST function, the 3RU thermal overload relay is equipped with a STOP function.
