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Choosing the right
isolator switch for the job

Our IP66 isolators are available in 2P, 3P and 4P, because switching both the active and neutral ensures others are safe when working. The range can handle any type of load WITHOUT derating - including an AC-23A inductive load such as an Air Conditioner, Motor or Compressor - making your job faster, safer & easier.

Appliances, when hard wired, shall be provided with a suitable lockable isolation device, installed adjacent to the unit including water heaters, motors/compressors, air conditioners, heat pump systems…

The selection of an isolator is dependent upon many parameters:
01 - the number of poles,
02 - the type of electrical load it needs to isolate
03 - its consumption under normal operation
01 - Number of poles
In the wiring rules, the minimum requirement for isolation devices is to isolate all active conductors from the circuit. However, the best practice is to also isolate the neutral, for the safety of other people when maintenance is required. Manufacturers generally recommend this as well.
02 - Type of electrical load
Loads are categorised into various AC ratings (AC21, AC-22, AC-23 etc.) and the higher the AC rating the more inductive the load becomes. AS/NZS IEC 60947.3 defines utilization categories as well as their applications:
Frequent operationOccasional operationTypical applicationsExamples
AC-20A*
AC-20B*
Connecting and breaking under no load
*Not used in Australia
AC-21A
AC-21B
Resistive loads including moderate overloads
Electric hot water heater
AC-22A
AC-22B
Mixed resistive and inductive loads including moderate overloads
Fluorescent lamps
AC-23A
AC-23B
Highly inductive loads or motor loads
Compressors, air conditioners, motor loads
03 - Consumption
The selection of an isolating switch must meet or exceed the ratings of the load within the applicable utilization category. To find out the current demand of the load depends on the type of load.
JG Isolator
Resistive loads
The current demand of a heating appliance or an incandescent lamp is easily obtained from the nominal power quoted by the manufacturer (i.e. 1>cosᵩ>0.95)
The currents are given by:
- 3-phase case: Ie = Pn ÷ (√3 x U)
- 1-phase case: Ie = Pn ÷ U
Where Ie is amps; U is volts, voltage between the terminals of the equipment; Pn is watts. If Pn is in kW, then multiply the equation by 1,000
Motor / Compressor loads
Motor/compressor applications include Heat pumps, Air-conditioning systems, Pumps, Ventilators and Elevators.

The compliance plate of an appliance or air conditioner would provide the maximum power input in kW or the maximum load current in A.

The difficulty with all motor/compressor loads are the high inrush currents which can amount to 5-10 times the nominal current. Also, inductive loads tend to build electric arcs during shut off. Therefore, all Hager IP66 Isolator switch ratings are given at utilization category AC-23A without de-rating.
Isolator selection
Once you know all of the required information, you can use the table below to help you select the right isolator for your installation.
Tips:
  • Best practice is to switch the neutral
  • AC-23A for HVAC and motors
  • All of our isolators are AC-23A WITHOUT derating
ReferenceJG220INJG232INJG240INJG263INJG320INJG332INJG340INJG420INJG432INJG440INJG463IN
Number of poles
2P
2P
2P
2P
3P
3P
3P
4P
4P
4P
4P
Rated operational current Ie
20A
32A
40A
63A
20A
32A
40A
20A
32A
40A
63A
Rated operational power Pe
 
 
 
 
 
 
 
 
 
 
 
AC-21A
4.8kW
7.6kW
9.5kW
15.0kW
14.5kW
23.2kW
29.0kW
14.5kW
23.2kW
29.0kW
45.6kW
AC-22A
4.0kW
6.4kW
8.0kW
12.6kW
12.2kW
19.5kW
24.4kW
12.2kW
19.5kW
24.4kW
38.4kW
AC-23A
3.3kW
5.2kW
6.5kW
10.2kW
9.9kW
15.9kW
19.8kW
9.9kW
15.9kW
19.8kW
31.2kW