Kohler S340 Automaitic Transfer Switches Operation and Installation Manual (tp5087)

An S340 automatic transfer switch sits between your utility line and generator, usually in a plant room or outdoor enclosure, and decides where your building gets power when the grid drops. This manual is what I’d keep on hand when installing, wiring, or checking operation of that switch so it transfers cleanly and doesn’t nuisance-trip. If the switch starts hanging mid-transfer or refuses to go back to utility after the power returns, this is the document I’d use to verify settings, confirm connections, and walk through the basic functional checks before digging deeper.

Applications & Use Cases

• Plan and verify installation of the S340 so it’s mounted, grounded, and routed correctly before energizing anything.
• Trace control wiring between the generator, utility, and switch to isolate miswired signals during startup or commissioning.
• Check operating sequences when the switch won’t transfer, transfers slowly, or chatters under load.
• Confirm field-adjustable settings so time delays and modes match the building’s power needs.
• Support parts identification by matching what you see in the enclosure to the correct components when ordering replacements.

FAQ

Q: Can I keep this manual on a tablet in the field?

A: Yes, it’s practical to use digitally so you can zoom in on diagrams and search terms while standing at the switch.

Q: Is it worth printing this manual?

A: A printed copy is handy for marking notes, taping key pages near the switch, and working where screens aren’t convenient.

Safety Note

Always de-energize and lock out all sources before opening or working inside the transfer switch.

Kohler S340 Automaitic Transfer Switches Index:

Safety Precautions and Instructions
Introduction
Ratings

Section Installation
Unpacking
Lifting
Mounting
Line Connections
Auxiliary Connections
Engine Starting Connections

Section Functional Tests
Manual Operation Check
Voltage Checks
Electrical Operation Test

Section Operation
Control Switches and Indicators
Sequence of Operation
Normal Source Failure
Normal Source Restoration

Section Accessories
Fourteen Day Generator Set Exercising Timer
Accessories CD D and G
Seven Day Solid State Generator Set Exercise Timer
Accessories KA P R S
Time Delays
Pilot Lights
Battery Charger
Auxiliary Contacts Relay
Auxiliary Contacts Main Shaft
Source Monitors Inphase
Source Monitors Sync Check Relay
Source Monitors Voltage Frequency Phase Sequence
Test Switches
Time Delay Override Switches
Transfer Inhibit Switches
Meters
Load Shedding Contacts
Overlapping Neutral
Preferred Source Switches
Terminal Lugs
Logic Protection Fuses
Nonautomatic Switch Operation
Engine Cranking Limiter
Audible Alarm
Enclosure Heaters
Voltage Surge Withstand Protection

Section Wiring Diagrams and Drawings

Kohler