
598-DF18146 A-B Communication Processor
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IN STOCK598-DF18146 A-B Communication Processor
OVERLOAD RELAY CLASS DESIGNATIONS - Industry standards (NEMA Part ICS 2-222) designate an overload relay by a class number indicating the maximum time in seconds at which it will trip when carrying a current equal to 600 percent of its current rating. A Class 10 overload relay will trip in 10 seconds or less at a current equal to 600 percent of its rating. A Class 20 overload relay will trip in 20 seconds or less at a current equal to 600 percent of its rating. A Class 30 overload relay will trip in 30 seconds or less at a current equal to 600 percent of its rating. Allen-Bradley standard overload relay protection using either Type N or W heater elements provide Class 20 operation and are recommended for General Application. Specific Applications may require Class 10 or Class 30 overload relays. Class 10 overload relays are often used with hermetic motors, submersible pumps, or motors with short locked rotor time capability. Class30 overload relaysshould be used with motors driving high inertia loads where additional accelerating time is needed. For application regarding Class 10 and 30 overload relays, consult local Allen-Bradley office.HEATER ELEMENT SELECTION - The “Full Load Amps.” listed in the tables are to be used for heater element selection. The rating of the relay in amperes at 40” C is 115% of the “Full Load Amps.” listed for the “Heater Type No.” Refer to the motor nameplate for the full load current, the service factor, and/or the motor classification by application and temperature rise. Use this motor nameplate information, the application rules, and the “Full Load Amps.” listed in the proper table (see Index on Page 2) to determine the “Heater Type No.”
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