SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
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Overview of applications for contactors and contactor assemblies
The table below provides an overview of the most important applications for contactors and
contactor assemblies.
Description and suitable contactor versions
Switching motorized
loads
Contactors for switching three-phase motors (utilization category AC-3)
• 3RT20 3-pole motor contactors
• 3RT233..4AA0 / 3RT234..4AA0 4-pole motor contactors
• 3-pole 3RT10 motor contactors
• 3-pole 3RT12 vacuum contactors
Switching resistive
loads
Contactors for switching resistive loads (utilization category AC-1)
• 3RT20 3-pole power contactors
• 3RT23 4-pole power contactors (4 NO contacts)
• 3-pole 3RT24 power contactors (3 NO contacts)
• 3RT25 4-pole power contactors (2 NO contacts + 2 NC contacts)
• 3-pole 3RT14 power contactors
Changing the polarity
of hoisting gear motors
Changing the polarity of hoisting gear motors or switching two separate loads.
• 3RT25 4-pole contactors (2 NO contacts + 2 NC contacts)
Switching in the
auxiliary circuit
Switching devices for control and auxiliary circuits (utilization
categories AC-12/AC-15/AC-14/DC-12/DC-13).
• 3RH21 4-pole contactor relays
• 3RH22 8-pole contactor relays
Switching of capacitive
loads
Contactors for switching capacitive loads (utilization category AC-6b)
• 3RT26 3-pole capacitor contactors
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