Overload heater sizing chart square d. Overload relay has no power contacts and cannot disconnect the motor by itself. Thermal units are for use in motor starters to help provide motor protection up to 266 full load amps. Thermal unit selection tables 13 thru 18. Motor overload relays and thermal units help prevent motor damage and extend motor life.
Iec overload relays help adjust the maximum current a motor is allowed to draw. To help the technician to protect their motors with an accurate motor selection guide. Call our experts at 800 476 1486 or chat live. Overload relay heater tables approximate ac motor amps technical 883 siemens industrial control products heater tables and replacement parts 17 formulaapproximate full load amps for other motors 208 volt full load amp 230 volt current 110 2 phase fla 0866 the 3 phase fla 2 phase 3 wire current in common wire 141 that in the other 2 lines.
G order type e thermal units by number from square dschneider electric furnas electric company batavia illinois or a furnas distributor at 900 each subject to motor control discounts. One page can be cut and folded to be used as a pocket guide. Square d manufactures three types of overload relays the melting alloy the bimetallic and solid state. It is in to pages.
Manual motor protectors can keep equipment from overheating and overloading. Allen bradley cutler hammer general electric siemensite square d westinghouse need help finding the right renewal part. Below is a list of tables of overload heaters for the more common applications. H type a thermal units for full load currents lower than those listed in this table are available.
Overload relay heater tables selection of heater elements for overload relays general formulaapproximate full load amps for other motors 208 volt full load amp p 230 volt current u 110 2 phase fla p 0866 u the 3 phase fla 2 phase 3 wire current in common wire p 141 u that in the other 2 lines 25hz 1500 rpm amps p amps of 60hz 3600 rpm. Square d heater sizing sheets free download as pdf file pdf or read online for free.