The 3RU61/3RU51 thermal overload relays can be used for the protection of three-phase and single-phase AC or DC motors.
If 3RU61/3RU51 thermal overload relay is used to protect single-phase AC or DC load, it is necessary to connect three poles in series.
According to the IEC60947-4-1 standard, the 3RU61/3RU51 thermal overload relays have temperature compensation in the temperature range of -40 to +60°C.
For the temperature range +60°C to +80°C, the upper limit setting must be corrected by the correction factor given in the table below.
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