Is there low-pressure cut-off (auto-start-off) on this switch when pump runs dry?

No. Adj low pressure and high only

Does this 9013 fsg2 03/50 have a switch arm? the specs say it does, but the picture doesen't show it.

Mine did not have a switch arm.

How much pressure on tank ?

When the tank presure drops to 30psi switch contacts diconnects at 50psi, that the pressure in the tank, there is a small amount of adjustment in this switch maybe +_ 5psi

ASIN	B00CONESDG
Actuator Type	Push Button
Best Sellers Rank	33,640 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 93 in Pressure & Vacuum Measurement
Brand	SQUARE D
Circuit Type	1-way
Colour	Black
Connectivity Protocol	Wi-Fi
Connector Type	Screw In
Connector type	Screw In
Contact Material	Stainless Steel
Contact Type	Normally Open
Contact type	Normally Open
Control Method	Touch
Current Rating	30 Amps
Current rating	30 Amps
Customer Reviews	4.5 out of 5 stars 1,226 Reviews
Global Trade Identification Number	00785901077206
Included Components	pumptrol
International Protection Rating	IP54
Item Dimensions	10.2 x 10.2 x 7.6 centimetres
Item Type Name	Square D by Schneider Electric FSG2J21CP 30-50 PSI Pumptrol Water Pressure Switch
Item Weight	0.01 Ounces
Manufacturer	PumpTrol
Material	Stainless Steel
Model Number	SQUARE D - FSG2J21CP
Mounting Type	Surface Mount
Number of Items	1
Number of Positions	2
Operating Voltage	240 Volts
Operating voltage	240 Volts
Operation Mode	ON-OFF
Operation mode	ON-OFF
Specification Met	RoHS, WEEE, IP54
Switch Type	Pressure Switch
Terminal	Screw
UPC	785901077206
Unit Count	1.0 Count

SQUARE D 9013 FSG2 30/50 Schneider Electric FSG2J21CP 30-50 PSI Pumptrol Water Pressure Switch

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