STS 300 Series - Electrical Connections

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Electrical Connections
The supply voltage should be in accordance with the rating specified on the nameplate on the front cover.
Connect supply voltage to terminals 1 & 2. There are no connections to terminals 3 & 4. Connect Normally
Open (NO) and Normally Closed (NC) contacts to interlocking control contactors to permit the operation of
pumps or valves when a proper ground is detected. Do not connect these contacts directly to motor loads.
An optional power on/off switch rated for the environmental conditions can be installed to disconnect power to
the unit while not in use. This will extend the life of the indicating bulbs.
Model
Connection
Nominal Voltage
Connection
G2
120VAC
N
L
G4
240VAC
L
L
G12
12VDC
-
+
G24
24VDC
-
+
Max Voltage
Min Voltage 102VAC 204VAC 9VDC 18VDC
130VAC 240VAC 15VDC 30VDC
Model
Connection
Nominal Voltage
Connection
G2
120VAC
N
L
G4
240VAC
L
L
G12
12VDC
-
+
G24
24VDC
-
+
Max Voltage
Min Voltage 102VAC 204VAC 9VDC 18VDC
130VAC 240VAC 15VDC 30VDC
12345678910
NC2
NC1
NO2 COM2
NO1 COM1
No Connection No Connection
DRY CONTACTS
10A 250VAC
*NOTE: NO: NORMALLY OPEN CONTACT THAT CLOSES WHEN GROUND IS ESTABLISHED
NC: NORMALLY CLOSED CONTACT THAT OPENS WHEN GROUND IS ESTABLISHED
R
G
Customer Connections
*Note
*Note
Terminal Block
Mounted Inside
Explosion-Proof
Enclosure
5.000in
[127mm]
4.375in
[111.125mm]
3.738in
[85.69mm]
11.125in
[282.575mm]
4.500in
[114.300mm]
(4) 5/16"-18
Threaded Mounting
Holes
1/2" Deep
3/4"-14 NPT
Conduit Opening