The 3RV2031 MSP’s are UL approved as Self Protected Combination Motor Controllers which are also called Type E. In this application, all the required functions for a motor branch are provided in one device: disconnect, short circuit protection, motor control and overload protection. A type E terminal adaptor is required for all S2 frame 3RV2031 above 45A and all S2 frame as well as for all S3 frame motor starter protectors. These manual motor starters are also approved for use as follows:
– Manual Motor Controller: Motor starter, motor disconnect, control and overload protection.
– Group Installation: Motor starter only, motor disconnect, control and overload protection.
– Tap conductor Protection in Group Installation acc. NEC: Motor starter only; motor disconnect, control and overload protection.
When the 3RV is used with one of the 3 above mentioned approvals, they can be installed downstream of one circuit breaker or fuse set.
The time/current characteristic, the current limiting characteristics and the I²t characteristics were determined in accordance with DIN VDE 0660 or IEC 60 947.
The tripping characteristic of the inverse-time delayed overload releases (thermal overload releases or ’a’ releases) for DC and AC with a frequency of 0 to 400 Hz also apply to the time/current characteristic.
The characteristics apply to the cold state. At operating temperature, the tripping times of the thermal releases are reduced to approximately 25 %.
Under normal operating conditions, all three poles of the device must be loaded. The three main conducting paths must be connected in series in order to protect single-phase or DC loads.
With 2-pole and 3-pole loading, the maximum deviation in the tripping time for 3 times the setting current and upwards is ± 20 % and thus in accordance with DIN VDE 0165.
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