Samlex America STS-30 - Manual (Page 4)

4 | SAMLEX AMERICA INC.
frequently, the total AC power requirement of all the system loads exceeds the camp-
ground / rV park’s power inlet and consequently, requires the genset to power the
entire system.
Thus, there may be 3 types of AC power sources. Transfer switches are used to config-
ure switching of the AC power sources so that the priority of the AC sources is:
- electric utility power
- Genset (generator)
- Inverter
Sizing oF tranSFer Switch
Determining which circuits you will require during a power outage is the first step in
selecting the proper backup generator / inverter and the transfer switch. Since most
home appliances operate intermittently, a 3000 watt generator / inverter and a 30 A
Transfer Switch can provide adequate power to circuits for the most common appli-
ances, such as furnace, lights, refrigerator, freezer, microwave oven, and TV.
If your home has a deep well pump with up to 1 HP motor, a 5000 watt generator and
50 A Transfer Switch will be required to provide the starting capacity for the pump.
Larger wattage units can be selected for simultaneous starting and operation of multi-
ple appliances.
tranSFer Switch StS-30
Transfer Switch STS is designed for single phase operating voltage of 120 VAC, 60 Hz
and can handle input/ output current of up to 30 A or an Apparent Power of 3600
VA (Apparent Power = Volts X Amps. In this case: 120 V X 30 = 3600 VA). It consists of
a Transfer relay (fig. 2, r1) and a relay Control PCb (fig. 2, PCb1) for controlling the
operation of the Transfer relay. figs. 1 & 2 show the layout.
SecTIOn 1 | Introduction
1. 15A power cord for
connection to inverter
(<1800 VA).
2. 15A, NeMA5-15P North
American plug
3. NeMA5-20r duplex
receptacle for battery
charger
4. ¾” cable clamp for shore
power cord / generator cord
5. Cable clamp for inverter
power cord
6. Grounding lug
7. Spare knockouts for ¾”
cable clamp. Additional ¾”
& 1” knockouts are provided
on the two other sides (not
shown).
7
6
2
1
4
5
3
Fig. 1 External view and layout