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UTILIZATION CATEGORIES

Utilization Typical application
category
AC-1 Non-inductive or slightly inductive loads, resistive furnaces.
Example: resistive furnaces
AC-2 Slip-ring motors: starting, plugging and reversing.
Example: squirel-cage motors,lifts,elevators,compressors,pumps,air-conditioning
AC-3 Squirrel-cage motors: starting, disconnecting while running
AC-4 Squirrel -cage motors: starting, plugging, reversing, jogging.
Example: lifts,elevators,compressors,pumps,air-conditioning,motar mixers.
AC-5a Switching of electric discharge lamps
AC-5b Switching of incandescent lamps
AC-6a Switching of power transformers
AC-6b Switching capacitor banks
AC-7a Small inductive loads in domestic appliances and similar applications
AC-7b Motor loads for domestic appliances
AC-15 Control of electromagnetic loads (>72 VA)
AC-20 Connecting and disconnecting under no-load conditions
AC-21 Switching of resistive loads including moderate overloads
AC-22 Switching of mixed resistive and inductive loads, including moderate overloads
AC-23 Switching of motors or other highly inductive loads

DC-1 Non-inductive or slightly inductive loads, resistance furnaces
DC-3 Shunt-wound motors:plugging,reversing,jogging,dymanic braking
DC-5 Series-wound motors: starting,plugging,reversing,jogging,dynamic braking
DC-6 Switching of incandescent lamps
DC-13 Control of electromagnets
DC-20 Connecting and disconnecting under no-load conditions
DC-21 Switching of resistive loads including moderate overloads
DC-23 Switching of highly inductive loads (e.g. series-wound motors)
Note: AC-11 is changed to AC-15 and DC-11 to DC-13 respectively

Basic materials types, which are used for contact production of power relays are:
a) AgCd - for resistive loads (because of Cd malignity is this contact on recess.
b) AgNi - for resistive loads, good switches and transfers (no oxidisation) low currents/voltages, is not for peak currents and loads with inductive factors.
c) AgSn or AgSnO 2 - for switching the loads with inductive part, not good for low currents/voltages, has better immunity for peak currents, good
for switching DC, not so good for switching the resistive loads.
d) Wf (tungsten) - special contact for switching peak currents with inductive loads.
e) gold alloy (AgNi/Au) - for the ‘better’ contact for low currents/voltages, antioxidant.

IPD INDUSTRIAL PRODUCTS Phone: 1300 556 601 www.ipdgroup.com.au