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WHAT ABOUT TRANSFER SWITCHES?
How transfer switches work and why you must use them.
 
PLEASE READ CAREFULLY. FOLLOW ALL SAFETY PRECAUTIONS AND WARNINGS.
READ THE SAFETY INSTRUCTIONS THAT COME WITH YOUR TRANSFER SWITCH AND GENERATOR.
 
PLEASE ALSO READ GENERATOR SAFETY
 
HOW AN AUTOMATIC GENERATOR AND TRANSFER SWITCH SYSTEM WORKS
diesel generator
  • The completely automatic transfer switch monitors incoming voltage from the utility line, around the clock.
  • When utility power is interrupted, the automatic transfer switch immediately senses the problem and signals the generator to start.
  • Once the generator is running at proper speed, the automatic transfer switch safely shuts off the utility line and simultaneously opens the generator power line from the generator.
  • Within seconds, your generator system begins supplying electricity to the critical emergency circuits of your home or business. The transfer switch continues to monitor the utility line conditions.
  • When the automatic transfer switch senses the utility line voltage has returned at a steady state, it re-transfers the electrical load back to the utility line and resumes monitoring for subsequent utility loss. The generator will continue to run for an engine cool-down period of several minutes while the entire system stands ready for the next power outage.

There are other reasons to uses a transfer switch. You may void your fire or homeowners insurance if you install a generator without a transfer switch, because these switches are required by the building code electrical codes in most areas. The information below explains other information why transfer switches are required. NEVER CONNECT A GENERATOR THROUGH A DRYER PLUG OR OUTLET IN A BUILDING. YOU CAN CAUSE A FIRE OR ELECTROCUTE SOMEONE!


USE A TRANSFER SWITCH
It must be installed by a qualified electrician or knowledgeable person and must comply with all applicable laws and electrical codes.
diesel generators for sale

    Use A Transfer Switch

diesel generator Use a transfer switch when connecting to a building's electrical system.
find diesel generators Have an Electrician install the isolation switch.


TRANSFER SWITCH PROTECTS LINEMAN
The utility line voltage is normally "stepped down" before entering the building, by a transformer. The transformer can work in reverse when voltage is sent through it in the opposite direction and "step up" the voltage. This stepped up voltage, back-feeding through the utility lines, may electrocute workers that come into contact with the utility lines.
diesel


Protects Linemen

diesel generator A Properly Installed Transfer Switch Protects Linemen


A TRANSFER SWITCH PROTECTS THE HOME
Improper connections can allow electrical current from the generator to shor circuit with utility line current when power is restored. This can cause a fire in the electrical system.

    Protects The Home or Business

diesel operated generator A Properly Installed Transfer Switch Protects Your Home or Business

A TRANSFER SWITCH PROTECTS THE GENERATOR
Improper connections can allow electrical current from the generator to short circuit with utility line current when power is restored. This could cause the generator to explode or burn.
diesel fuel generator website      Protects The Generator

diesel generator A Properly Installed Transfer Switch Protects Your Generator

THERE ARE SEVERAL TYPES
There are several types of transfer switches that may be used with our generators. We sell both Portable and Small Generator Transfer Switches and Large/Industrial Generator Transfer Switches.

For Portable and Small Generator Transfer Switches

For portable generators and for applications where only part of home or business will have emergency power available; we offer Small Transfer Switches, described below. These switches are limited to 21,000 watts (21 kW) and are usually manually switched.

The information below gives specifications and a just a few recommendations for matching a transfer switch to a generator. All the transfer switches we carry are UL listed and CSA certified. We have detailed descriptions and tables on each type of switch. If you don't find what you need, please ask us. Please go to the Small Transfer Switch page to see the details and the many models we offer. Here is a sample:

Suffix

Description

A Indoor Hardwire, with power inlet.
B Outdoor Hardwire, No power inlet.
C Outdoor Hardwire, No power inlet, With Wattmeters
 

Pro/Tran® INDOOR SURFACE OR FLUSH MOUNT MANUAL TRANSFER SWITCHES

All models Listed to UL1008, Transfer Switch Specifications

Nobody get the job done like GeneratorJoe!

20216A Indoor Surface Transfer Switch 30216A Indoor Surface Transfer Switch 30310A Indoor Surface Transfer Switch 30408B Indoor Circuit Transfer Switch 31406B Indoor Circuit Transfer Switch 31410B Indoor Circuit Transfer Switch 31410B Indoor Circuit Transfer Switch 31410B Indoor Circuit Transfer Switch 30310A Indoor Surface Transfer Switch
  Pictures are Typical. Some pictures are not available. Click on pictures for larger view.
Model Number 20216A 30216A 30310A 31404B 31406B 30408B 31410B 51410B 51410C
Connection Type Cord Connected or Hardwire Hardwire
Maximum Watts 5000 7500
Max Single-Pole Circuits 6 10 4 6 8 10
Max Double-Pole Circuits 1 5 1 1 4 5
Max Combined Load@125VAC 40A 60A 125A
Max Combined Load@250VAC 20A 30A 50A
Max Load Per Circuit from Generator 4/15A or 2/20A 6/15A or 4/20A 4/15A 4/15A or 2/20A 6/15A or 2/20A 6/15A or 4/20A
Max Load Per Circuit from Load Center 20A
Minimum Recommended Cord Size 12 Gauge 10 Gauge 8 Gauge
Conduit Length 18"
Conduit Trade Size 3/4" 1" 3/4" 1"
Dimensions, inches 7.5"h x 7"w x 4.5"d 13.75"h x 7"w x 4.5"d 7.5"h x 7"w x 4.5"d 13.75"h x 7"w x 4.5"d
Shipping Weight, lbs 9 9 13 8 9 13 14 13 14
Cabinet Type Nema 1
Wattmeters Yes No Yes
Flush Mount Kit KF6 KF6 KF10 KF6 KF6 KF10
Hinged Cover Kit CK6 CK6 CK10 CK6 CK6 CK10
Power Inlet, Nema (Standard) L14-20 L14-30 None
Power Inlet 125 VAC (Option) N/A PP515 or PP530 PP530 N/A
Power Inlet 125/250 VAC (Option) N/A L1420F or L1430F L1420F or L1430F LL550F
Power Inlet Box (External) PB20 PB30 PB30 PB30 PB50
Wattmeter Panel Standard Standard Standard WP7500 WP7500 Standard WP7500 WP1250 Standard
Power Cord 10 foot PC2010 PC3010 Not Available
Power Cord 20 foot PC2020 PC3020 Not Available
Power Cord 40 foot PC2040 PC3040 Not Available

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.   We Provide Several Types

diesel generator  4 Circuit, 120V/15A (3-prong)
diesel generator  6 Circuit, 120/240V/20A (4-prong)
diesel generator  6 Circuit, 120/240V/30A (4-prong)
diesel generator  10 Circuit, 120/240V/30A (4-prong)
diesel generator  12 Circuit, 125/250V/50A
      (3-pole 4-wire plug)

 See our Gen-Tran ordering guide and catalog.  Click Small Transfer Switches


TRANSFER SWITCH OPERATION -

For Small & Portable Generators
The Transfer switch isolates selected circuits from the home with "Break" then "Make" switches. Each switch has 3-positions;
LINE, OFF and GEN (generator). In the LINE position, utility power feeds the selected circuits. In the GEN position, generator power feeds the selected circuits. To switch from LINE to GEN, the switch is passed through the OFF position. This allows a positive break to occur, which prevents sparking, arcing or short circuits that might be created if the positive break was not part of the system.

Individual circuit protectors protect each selected circuit from overload. This allows a larger generator to be connected to the transfer switch without the transfer switch being overloaded.

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.Transfer Switch Operation

diesel generator  Offers "Break" then "Make" switches
diesel generator  Only pre-wired circuits can be powered protecting against overload.
diesel generator
  Each circuit is protected ˆˆ circuit protector.


For Large/Industrial Generator Transfer Switches

For Large or Industrial generators and for applications where all of the home or business will have emergency power available; we offer Large/Industrial Transfer Switches, described below. These switches are can handle various voltages and are generally unlimited in the size available. These switches usually transfer automatically and have a wide range of features including automatic excising, changeable start and stop delay times, changeable cool down times and other features.

Transfer switches are available fused and with breakers. Special switches are available that allow using more than one generator at a time, switching between multiple generators and other situations.

Click on the pictures below for specific information about the types and sizes available. Most transfer switches are UL listed, and come in a variety of enclosures.

diesel generator
Residential, Commercial, Industrial
30 Amp to 3000 Amp, Open, Enclosed, Automatic & Manual


Service Entrance Series 7000
150 Amp to 4000 Amp, Service Entrance
 

           diesel generator           Critical & Distributed Power
30 Amp to 4000 Amp, Enclosed, Automatic & Manual

diesel generator
Soft Load Series 7000
150 Amp to 4000 Amp, Service Entrance

 

5.jpg (16446 bytes)

.   We Provide Several Types and Sizes

diesel generator  Indoor, 100 to 4,000 Amps
diesel generator  Outdoor, 100 to 4,000 Amps
diesel generator  Paralleling Panels
diesel generator  Load Shedding
diesel generator  Automatic and Manual

diesel generator  Enclosures of all types

 See our ordering guide and catalog.      ---->    Large/Industrial Transfer Switches


TRANSFER SWITCH OPERATION

For Large Industrial Home and Business Generators
The Transfer switch isolates the entire electrical service panel. The Electric Codes in most states require that the building service and Transfer Switch size be the same. If the building has a 200 Amp service the Transfer Switch must also be 200 Amp. This is true even if the generator is smaller in amperage than the building service.

Most Electric Codes also require that the buildings total load cannot exceed the total load that the generator is capable of. This means that you may have to install devices that prevent some circuits from being used if the generator is "on-line".

For all these situations you should utilize the services of a qualified electrician. Improper wiring of equipment can lead to fires, explosions, serious injury and even death.

Large industrial transfer switches have an automatic mode that switches the transfer switch and starts the generator on loss of power and then stops the generator and switches the transfer switch back when power is restored. They also have "OFF" modes so that the generator will not start automatically.

Each switch type and brand has its own features and options. We carry only the top brands of switches including ASCO, Generac, Kohler, Onan and  Zenith. All are high quality and field proven to be reliable.

Follow good safety practices at all times! PLEASE ALSO READ GENERATOR SAFETY.

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