Overload Relay

PRODUCT DESCRIPTIONSiemens 3RU2116-1GB0 3 pole IEC rated thermal overload relay that is adjustable from 4.5 to 6.3 AMPS. This Class 10 overload relay trips in under 10 seconds or less in an over current situation and has screw terminals for easy installation and removal.  1 normally open and 1 normally closed auxiliary contacts come standard on the 3RU2116-1GB0 along with the option for manual or automatic reset for direct mounting on any 3RT2015 through 3RT2018 3 pole contactor.

AMP Range 4.5 to 6.3 AMPSClass rating 10 (10 second or less)Auxiliaries 1 N.O. / 1 N.C.Terminals ScrewPhase loss protection Yes 
3RU2116-1GB0 technical information


The 3RU2116 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.

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