Toggle Defender Real-time Protection.

toggleDefender.ps1

#####################################################################
# Toggle Defender Real-time Protection
#
# Syntax:
#
#    Defender            - toggle Real-time Protection      (default)
#    Defender -state 0/1 - Set Real-time Protection to Enable/Disable
#####################################################################

param(
    [int] $state = -1
)

if ($state.equals(-1)) {
    $TargetState = $(Get-MpComputerStatus).RealTimeProtectionEnabled
    Set-MpPreference -DisableRealtimeMonitoring $TargetState
}
else {
    $TargetState=[boolean]($state -xor 1)
    Set-MpPreference -DisableRealtimeMonitoring $TargetState
}