Transfer Switches ATS

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20-150 kW Liquid-Cooled Standby Generator 

Generators  |  Controls and Transfer Switches:  Home Standby or Commercial Single and Three Phase ATS

Revolutionizing the Commercial Market

GUARDIAN® has long been known as America’s #1 choice in home standby generators. Now, we’re fast becoming recognized as the company that revolutionized the commercial market. That’s because we’ve eliminated the noise, fuel and installation concerns that traditionally made commercial standby power too costly. GUARDIAN Elite™ generators are reliable and value-oriented. So much so, they often pay for themselves during the first extended outage.

Commercial Standby Generators

At GUARDIAN, we keep your business… in business.

Guardian Elite or Commercial Generators Transfer Switches

Transfer Switches for GUARDIAN Liquid-Cooled ModelsThe transfer switch monitors utility power and signals the generator to start when utility power is interrupted. When utility power returns, the transfer switch returns the electrical load from the generator back to the utility. This ensures your most important electrical loads are powered, within seconds, even when you’re away.

The transfer switch is the difference between a truly automatic generator set and just another generator. No toggles to flip, no knobs to turn, no extension cords to run when you lose utility power. You will have the comfort and peace-of-mind knowing that your GUARDIAN standby generator does everything for you... automatiy.

Suggested Transfer Switch
When choosing a transfer switch, you must match or exceed the generator output amperage. The following table illustrates a suggested transfer switch to use with each generator. The transfer switch to be used is based on the kW rating and voltage of the generator. All GUARDIAN transfer switches are UL 1008 Listed to meet safety and performance standards.

kW Engine 120/240, 1Ø 120/208, 3Ø 277/480, 3Ø
20 1.6L RTS 100 amp RTS 100 amp N/A
25 1.6L RTS 200 amp RTS 100 amp N/A
35 2.4L RTS 200 amp RTS 200 amp RTS 100 amp
45 2.4L RTS 200 amp RTS 200 amp RTS 200 amp
60 3.0L RTS 400 amp RTS 400 amp RTS 100 amp
70 6.8L HTS 300 amp HTS 300 amp HTS 150 amp
80 4.6L HTS 400 amp HTS 300 amp HTS 150 amp
100 5.4L HTS 600 amp HTS 400 amp HTS 200 amp
100 6.8L HTS 600 amp HTS 400 amp HTS 200 amp
130 6.8L HTS 600 amp HTS 600 amp HTS 200 or 300 amp
150 6.8L HTS 800 amp HTS 600 amp HTS 300 amp

RTS 100-400 AMP (spec sheet)
These transfer switches are designed for a wide variety of applications that require up to 400 amps. RTS transfer switches are used with GUARDIAN generators that utilize a 3.0 liter engine or smaller. For larger generator engines, an HTS transfer switch must be used.

HTS 100-800 AMP (spec sheet)
These transfer switches are designed for simple monitoring, operation and maintenance. Common controls and LED lights are conveniently located on the front door panel. All components are front adjustable and removable for serviceability. HTS transfer switches can only be used with generators that utilize engines over 3.0 liters.

Transfer Switch

Transfer Switches for GUARDIAN Air-Cooled Models

The transfer switch monitors utility power and signals the generator to start when utility power is interrupted. When utility power returns, the transfer switch returns the electrical load from the generator back to the utility. This ensures your most important electrical loads are powered, within seconds, even when you’re away. Unlike other pre-packaged systems, GUARDIAN includes an automatic transfer switch as standard equipment with all models.

This transfer switch is the difference between a truly automatic generator set and just another generator. No toggles to flip, no knobs to turn, no extension cords to run when you lose utility power. You will have the comfort and peace-of-mind knowing that your GUARDIAN standby generator does everything for you... automatiy.

  • A two pole, 100-amp automatic transfer switch is standard equipment on models 05336T.
  • A two pole, 200-amp automatic transfer switch is standard equipment on models 05324T and 05259T.
  • A two pole, 200-amp Service Disconnect transfer switch is standard equipment on model 05261T.
These transfer switches are also available for liquid-cooled models or as an alternative to be purchased separately.
Standard Transfer Switch
Service Disconnect Transfer Switch
Model Number RTS-N-100A3 RTS-N-200A3
No. of Poles 2 2
Current Rating (amps) 100 200
60 Hz Phase Single Single
Voltage Rating (VAC) 250 250
Utility Voltage Monitor (fixed)
Pickup 70% 70%
Dropout 60% 60%
Return to Utility 15 seconds 15 seconds
Exerciser 15 min. weekly * Standard Standard
UL 1008 Listed Standard Standard
Dimensions (H" x W" x D") 20x15x7 20x15x7
Enclosure Type NEMA 3R Outdoor Rated NEMA 3R Outdoor Rated
Unit Wt. (lbs.) 35 35
* When used with liquid-cooled models. If used with air-cooled models exercise duration will be 12 minutes.


Click for
Spec Sheet

Controls and Transfer Switch

R-Series Digital Controller
H-100 Digital Controller
Transfer Switch
7 LED Indicator Lights Standard
High Temperature Shutdown Standard
Low Coolant Level Shutdown Standard
Automatic Voltage Regulator with Over-voltage Protection Standard
  • Voltage Regulation (at steady state from no load to 100% load
 ± 1.0 %
  • Frequency Regulation (at steady state from no load to 100% load)
 ± 0.5%
Engine Start Sequence Cyclic Cranking: Initially 15 sec. on, then 7 sec. rest, 7 sec. on. 90 sec. maximum duration
Safety Fuse Standard
Starter Lockout Starter cannot re-engage until 5 sec. after engine has stopped
2 Amp Battery Charger Standard
Engine Warm-up 10-15 seconds
Engine Cool-down 1 minute
Mode Switch
  • Auto Position
 Utility Failure / 7 day exerciser
  • Off Position
 Stops unit. Power is removed. Control and charger still operate.
  • Manual/Test Position
 Start with starter control, unit stays on. If utility fails, transfer to load takes place
Automatic Weekly Exerciser with Selectable Low Speed Exercise Standard
Controls and Transfer Switch
H-100 Digital Controller
32-Bit Microprocessor Single point of control for engine, generator and transfer switch functions
Automatic Voltage Regulator with Over-voltage Protection Standard
  • Variable Voltage Frequency Settings
 Allows matching V/F to load for more consistent output; prevents excessive engine lugging under load to protect motors and improve motor starting
  • Voltage Regulation (at steady state from no load to 100% load)
 ± 0.25%
  • Frequency Regulation (at steady state from no load to 100% load)
 Isochronous
Sealed Casing Protects against vibration, dust, heat moisture, corrosion, radio interference, electromagnetic interference and static discharge
Low Coolant, Hight Temperature and Low Oil Pressure Automatic Shutdown Standard
Digital Readout of AC kW, kVA, Power Factor and All Engine Functions Standard
Isochronous Govenor Control Standard
Predictive Maintenance Reminders Standard
3 Phase Sensing Protects motor by monitoring voltage across all 3 phases
2 Amp Automatic Battery Charger Standard
Fault Protection (I2T Function) Provides total generator winding protection under all fault conditions
Start/Stop Control Programmable auto-crank feature
Starter Lockout Standard
Automatic Weekly Exerciser with Selectable Low Speed Exercise Standard
Overspeed/Over-voltate Protection Standard
Overcrank Protection Standard
Emergency Stop Standard
RS485 Remote 2-way Communication with HTS Transfer Switch Standard
RS232 & RS485 Outputs Computer connections for remote monitoring and remote adjustments (with optional model and GenLink software)
Controls and Transfer Switch
Transfer Switch
Liquid-cooled models with 3.0 liter engines or smaller use RTS transfer switches (100-400 amps).
Liquid-cooled models with engines over 3.0 liters use HTS transfer switches (100-800 amps).
For more information please see the Transfer Switch page.

 

Shipping may be extra - for shipping quote and ship time *Cash discount for wire transfer

* Cash discount for wire transfer
** Delivery time may be up to 8 weeks during natural disasters.  Plan ahead for Hurricane Season!!

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Commercial single phase and commercial three (3) Phase Rated Amps at 120/208V, 0.8pf Generac Guardian Elite Models 

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