For the best Gemaire experience, please update your web browser.

5-2-1 CSRU3 - 4 & 5 Ton Hardstart Device

Item: CSRU3
This product is currently not available for purchase.
What’s the price?
Sign in or register for pricing.

Your Order Templates
Save products for later, or create order templates to quickly re-buy items for routine jobs.

Add To Order Template

Inventory At Nearby Branches



A 5-2-1 Compressor Saver® (aka Hard Start Kit) significantly reduces the amount of time your AC Compressor takes to Start. Air conditioners with the 5-2-1 Compressor Saver® typically start in 30-50% less time than air conditioners without the product.

This is important because the compressor on your air conditioner consumes more power on start up than any other device in your home. Start up is the hardest time in the life of any type of electrical equipment. This is due to the huge current that rushes in when a switch is thrown and power is first applied.

The heat that accompanies the in-rush current can damage vital electrical components - the air conditioner compressor, the air conditioner run capacitor and contacts. An ac compressor may consume 45,000 watts of power while the motor is trying to start - TEN times more power than it uses while running. By comparison, the large burner on an electric stove only consumes approximately 5,000 watts on high.

An air conditioner can start up more than 6,000 times in a single air conditioning season. With a 5-2-1 Compressor Saver® you will reduce ac repairs and the need for air conditioning service.

Some top-of-the-line air conditioners come from the factory with 5-2-1 technology built in. Now you can have a 5-2-1 Compressor Saver® installed in your existing ac unit by a professional.

The cost of a 5-2-1 Compressor Saver® is a fraction of the cost of replacing an ac compressor damaged by hard starts. It could add years to the life of your compressor and other electrical components associated with your a/c system.


Name5-2-1 CSRU3 - 4 & 5 Ton Hardstart Device
Gemaire Item NumberCSRU3
Manufacturer Product NumberCSRU3
SKU - PIM Number1373629127512
ERP Number147308
Unit of MeasureEA
Weight0.1 Pounds (Lb)
Length6.5 Inches (In)
Width3.0 Inches (In)
Height6.5 Inches (In)
Country of OriginUSA
Brand5-2-1® Compressor Saver®
Voltage208-240 VAC
Drop Out Voltage50
Cycle/Hertz60 Hz
% Increase In Torque800%
Capacitor MFD µF270-324
Rated Load Amps35
Relay TypePotential
Application4-5 Ton Air Conditioners
Evaporating Temperature35°F to 55°F (1.6°C to 12.7°C)
Features5-2-1 Method is approved by all major Compressor Manufacturers
For Use With1 - 5 HP
Maximum Coil Voltage440
Pick Up Voltage175-195
Warranty OfferedYes
UL RecognizedYes
GEM - Case Quantity


Parts List

Parts list is loading, wait for a moment....