Introduction
When it comes to electrical work in your home, having the right breaker is crucial for safety and functionality. Square D is one of the most trusted and widely used brands for circuit breakers. Their 20 amp model provides reliable overcurrent and short circuit protection for a variety of residential and light commercial applications.
This comprehensive buying guide will provide you with everything you need to know about Square D 20 amp breakers – from what they do, to how to install and wire them correctly, as well as where to buy them, reset procedures, troubleshooting tips, and more. We’ll also look at why Square D breakers stand out from the competition when it comes to quality and performance.
Whether you’re replacing an old breaker or wiring a new circuit, read on to learn all about Square D 20 amp breakers to make an informed purchasing decision.
What is a Square D 20 Amp Breaker Used For?
A Square D 20 amp breaker is designed for 120 volt branch circuits with a load of up to 20 amps. It protects the circuit wiring and components from overcurrent damage due to short circuits or overloads.
20 amp breakers are commonly used for lighting circuits, receptacle (outlet) circuits, and individual appliances that require up to 20 amps such as window air conditioners, microwaves, dishwashers etc. However, they shouldn’t be used for large appliances like electric dryers or stoves that require 30-50 amp dedicated circuits.
Square D 20 amp breakers can be installed in any residential load center or sub panel that accepts 1 inch wide plug-on breakers. They are UL listed for use in Square D Homeline, QO, and NF panels as well as compatible panels from other manufacturers.
How to Install a Square D 20 Amp Breaker
Installing a Square D 20 amp breaker is a straightforward process but does require basic electrical knowledge and experience. Safety should always be the top priority when working with electrical wiring.
Here are the key steps to install a 20 amp Square D breaker:
Step 1: Turn Off the Power
The first thing you need to do is shut off the main power to the electrical panel you’ll be working on at the main breaker or fuse box. Use a non-contact voltage tester to confirm power is off before touching any wires or terminals.
Step 2: Remove the Knockout
Identify an unused breaker socket in the panel and remove the knockout plug using a hammer and screwdriver. This will create an opening to insert the breaker wires.
Step 3: Connect the Circuit Wires
Strip 5/8″ of insulation from the circuit wire ends using wire strippers. Insert the hot/live wire into the breaker port labeled ‘LINE’ and tighten the screw securely. Connect the neutral wire to the neutral bus bar.
Step 4: Mount the Breaker
Align the Square D 20 amp breaker properly and push it directly into the panel socket until it snaps and locks into place. Make sure the breaker is seated firmly and the tab on the hot terminal aligns with the slot on the bus bar.
Step 5: Test and Restore Power
With the breaker in the off position, restore power to the panel. Then switch the new breaker on and use a voltage tester to check for power at the circuit outlet. Turn the breaker back off before continuing work.
Follow local building codes and permit requirements related to electrical work. And always consult a professional electrician if you have any doubts about properly installing breakers.
Where Can I Buy a Square D 20 Amp Breaker?
Square D 20 amp breakers are widely available at most hardware stores, home improvement centers, and electrical supply stores. They can also be easily purchased online through Amazon, Home Depot, Lowe’s, Grainger, and other major retailers.
When buying a Square D breaker, always look for the Square D brand name and UL certification label to ensure you’re getting an authentic, high-quality product. Be sure to match the voltage (120V), amperage (20A), number of poles (1 or 2), and terminal style to your panel.
The cost of a single Square D 20 amp 1-pole breaker ranges from $10 to $20. multipole and GFCI or AFCI breakers will be more expensive. Buying in bulk or value packs can help save on cost.
Choosing an authorized supplier is recommended to avoid counterfeit breakers that could potentially compromise safety. Consulting an electrician is also a good idea to ensure you get the right breaker for your specific needs.
How to Identify a Square D 20 Amp Breaker
It’s important to be able to positively identify a Square D 20 amp circuit breaker before purchasing or installing it. Here are a few key ways to identify them:
- Look for Square D name/logo – Authentic Square D breakers will have the Square D name and logo stamped clearly on the face/handle.
- Check for UL certification – The breaker should have ‘UL Listed’ molded into the plastic housing, signifying it meets safety standards.
- 1 inch wide – Standard 20 amp Square D breakers are 1 inch wide and fit into panel slots designed for that size.
- 120V – 20 amp Square D breakers are designed for 120 volt circuits. This voltage rating will be marked.
- Terminal type – Square D 20A breakers have plug-on, hooked terminal ends to connect wires.
- Single or double pole – Check if the breaker can switch one or two poles/circuits.
- Housing color – Square D breaker plastic housings are made in shades of off-white, gray or black depending on the model line.
Confirming these attributes will help ensure you get a real Square D 20A breaker that will safely protect the circuit.
Why Choose a Square D 20 Amp Breaker?
There are many reasons why Square D breakers stand out as a top choice of electricians and DIYers for residential and light commercial electrical panels.
Reputation for Reliability
With over 100 years experience manufacturing electrical components, Square D has earned a reputation for making durable and reliable circuit breakers. They rigorously test products to meet demanding quality control standards.
Wide Compatibility
Square D 20A breakers are designed to work seamlessly with Square D load centers and panels. But they are also compatible with panels from GE, Siemens, Murray and other major brands, giving you flexibility.
Safety Features
Square D breakers feature thermal and magnetic tripping designed to detect overloads and short circuits, shutting off power rapidly to prevent fires. Arc fault (AFCI) and ground fault (GFCI) breakers provide extra protection.
Easy to Find Locally
Square D is the most widely distributed electrical product brand. Their breakers can be easily found at home improvement stores, electrical distributors and online retailers.
Good Value for Performance
For the quality and performance they deliver, Square D breakers are very competitively priced. They offer great value for money.
Square D’s stellar reputation, safety, reliability, and availability make their 20 amp breakers a go-to choice for residential electrical panels.
How to Reset a Square D 20 Amp Breaker
Like all circuit breakers, Square D 20 amp breakers are designed to trip and shut off electricity to the circuit when they detect an overload or short circuit. After diagnosing and fixing the underlying issue, the breaker needs to be reset to restore power. Here is how to safely reset a 20A Square D breaker:
Step 1: Fix the root cause
Determine what made the breaker trip in the first place. This might be a short circuit, damaged wiring, faulty appliance, or simply overloading the circuit. Fix this root problem before resetting the breaker.
Step 2: Turn the breaker to OFF
Locate the tripped breaker in your electrical panel and switch it to the full OFF position if it isn’t already.
Step 3: Wait 10-15 minutes
Allow some time for the circuit breaker mechanism to cool down completely after tripping.
Step 4: Flip breaker ON
With the main panel power still on, flip the Square D 20 amp breaker back to the ON position. Listen for a click indicating it has reset.
Step 5: Test circuit
Plug in a lamp or test receptacle for power. If the breaker immediately trips again, the underlying issue still exists and will need further troubleshooting by an electrician.
Following proper reset procedures is important to keep your electrical system running safely and efficiently. Call a professional if any concerns arise.
Can a Square D 20 Amp Breaker Be Used for Lighting?
Yes, a Square D 20 amp breaker can absolutely be used to protect and control a lighting circuit in your home.
A 20 amp breaker is the ideal size for powering general household lighting circuits because lights impose a relatively low amperage load. Large power-hungry lighting fixtures or transformers may require a 30 amp breaker instead.
The key is to calculate the total wattage of all lights on the circuit and make sure it remains below 20 amps. Most standard LED and incandescent bulbs consume 25 watts or less. Energy-efficient lighting keeps amperage draw low.
Any lighting circuit with multiple outlets or switches will require a 20 amp breaker for safety, regardless of actual wattage used. The breaker prevents overloads and protects wiring from shorts or other faults.
So in summary, the Square D 20 amp breaker is totally suitable and commonly used for lighting circuits while providing vital overcurrent protection. Just be sure not to exceed 20 amps total load when designing your lighting circuit.
What Appliances Need a Square D 20 Amp Breaker?
The Square D 20 amp breaker is an ideal choice for powering many common household 120 volt appliances and equipment. Here are some examples of devices that would typically require a dedicated 20 amp circuit and matched breaker:
- Window mounted air conditioners (5000 – 12000 BTU range)
- Electric space heaters (up to 1500W)
- Microwaves (900W to 1600W)
- Dishwashers, disposals
- Kitchen refrigerators and freezers
- Electric pressure washers (>1500W)
- Table saws and circular saws
- Electric water heaters (point-of-use)
- Deep well jet pumps
- Electric vehicle charging stations
- Media rooms / home theater equipment
Always check appliance power ratings and operating requirements to determine their breaker needs. High power devices like stoves, dryers and well pumps will need much larger 30 amp to 60 amp rated breakers.
But for most general purpose 120V circuits, the Square D 20 amp breaker serves as a reliable and versatile overcurrent protection device.
How to Replace a Square D 20 Amp Breaker
Square D 20 amp breakers can wear out over time or become damaged, eventually requiring replacement. Here are the steps to safely replace one with a new unit:
Step 1: Turn off power
Locate the main breaker or fuse box and switch the main to OFF. Use a non-contact tester to confirm.
Step 2: Remove old breaker
Unscrew and disconnect the wires from the faulty 20A breaker. Pull it straight out of the panel socket.
Step 3: Install new breaker
Match the new Square D breaker to the old one (1 vs 2 pole, voltage, amps). Insert it into the open socket until it clicks firmly into place.
Step 4: Connect the wires
Attach the hot and neutral wires to the matching terminals on the new breaker. Tighten securely.
Step 5: Test operation
Restore main power, turn breaker ON and test for proper operation. The new breaker should function normally without issues.
As always, exercise caution and call an electrician if any concerns arise while replacing breakers. Follow permit requirements and notify your insurance company if needed.
How to Troubleshoot a Square D 20 Amp Breaker
Square D 20 amp breakers are very reliable, but issues can arise over time that cause them to trip unexpectedly or fail to reset properly. Here is a basic troubleshooting guide:
Breaker trips repeatedly:
- Check for wiring short circuits and damaged cords using a multimeter. Repair or replace.
- Look for ground faults around outlets. Test with a GFCI outlet.
- Inspect for loose/corroded wire connections. Tighten or clean.
- Verify the circuit load isn’t exceeding 20 amps. Balance the electrical load if needed.
Won’t reset:
- Check for jammed internal breaker mechanisms. Exercise the switch multiple times to un-jam.
- Test for continued short circuits that may prevent resetting.
- Replace breaker if it fails to reset after short circuits are fixed.
No power downstream:
- Check that the breaker is firmly seated in panel socket.
- Verify the breaker switch is definitely in ON position.
- Test for open neutral wire connection.
Breaker won’t switch off:
- Breaker may be faulty. Replace immediately as it can’t provide overcurrent protection.
Call an electrician for further troubleshooting if the issue persists. Never bypass or modify a breaker illegally.
What is the Warranty on a Square D 20 Amp Breaker?
One major advantage of choosing Square D breakers is that they come with a generous warranty period compared to competitors.
New Square D 20 amp breakers are typically covered by a 5-Year Limited Warranty against defects in materials and workmanship. This covers residential installations.
The warranty is provided through authorized Square D distributors and dealers. It ensures you receive a free replacement if your 20A Square D breaker fails due to manufacturing defects during the 5 year period.
However, the warranty excludes damage from improper installation, overloads or external factors. Normal wear and tear over time is also not covered. Problems caused by using the breaker incorrectly or in an unsuitable application may void the warranty.
Always keep your original purchase receipt or invoice to show warranty eligibility if a defect arises. Contact Square D customer service to initiate the warranty return/exchange process for your 20 amp breaker.
Are Square D 20 Amp Breakers Reliable?
Yes, Square D has built an excellent reputation for manufacturing very reliable and durable circuit breakers over the past century. Their 20 amp residential breakers demonstrate impressive reliability in practical use and testing.
Key factors that make Square D 20A breakers so dependable:
- Rigorous UL testing to over 10,000 on/off cycles ensures longevity.
- Thermal and magnetic trip elements work consistently to prevent overheating.
- Water-resistant and fire-retardant plastic housings withstand environmental stresses.
- Premium copper and silver contacts minimize corrosion over time.
- Mechanical trip indicators display when a breaker has activated.
- Limited warranty provides for free replacement of defective units.
- Field failure rates of less than 0.5% – much lower than the industry average.
- Use of quality materials and automated manufacturing checks improves consistency.
For maximum safety and performance, Square D 20 amp breakers deliver outstanding reliability that facility managers and homeowners have counted on for decades.
How Long Does a Square D 20 Amp Breaker Last?
Square D 20 amp circuit breakers are designed to provide very long service lives when installed and used properly. Here is an overview of how long they typically last:
- Mechanical life expectancy – These breakers are designed and tested to withstand over 10,000 on/off operating cycles. This equates to 25+ years of average residential use.
- Electrical life expectancy – Square D rates the standard 20A breaker for up to 25,000 interruptions at full rated current. This translates to decades of overcurrent protection.
- Installed life expectancy – The expected service life is approximately 30-50 years or more when used in a compatible residential load center and within the proper current rating limits.
- Shelf life – Unused breakers in storage have an unlimited shelf life. Stored units have exceeded 30 years in working condition.
Keep in mind occasional maintenance may be needed over decades of use, like cleaning corroded connections or exercise switching to prevent jamming. But when installed correctly and not abused, Square D 20 amp breakers deliver very long, reliable service lives.
Are Square D 20 Amp Breakers Safe?
Yes, when properly selected and installed, Square D 20 amp breakers provide very safe and reliable overcurrent protection for home branch circuits.
Here are some key safety features:
- Tested to UL safety standards for circuit breakers.
- Trip quickly if overloaded or shorted to prevent fires.
- Residual current detection interrupts power on ground faults.
- Thermal and magnetic tripping mechanisms are proven safe.
- Enclosed in durable, fire-resistant thermoplastic housing.
- Designed with redundant fail-safe components.
- Available with AFCI and GFCI options for extra protection.
- Water-resistant enclosures for bathrooms and outdoors.
- Backed by a trusted American brand with a long history of safety.
Square D also rigorously tests for things like arc-fault containment and overheating. When used properly with adequate ampacity wiring, their 20A breakers provide very safe protection.
What is the Price of a Square D 20 Amp Breaker?
Square D 20 amp 1-pole standard circuit breakers typically cost between $10-$20 at most electrical and hardware stores. This represents a moderate price point when compared to other breaker brands.
Factors that influence the price:
- Quantity – Buying larger value packs with 6-10 breakers is cheaper per unit than singles.
- GFCI/AFCI – GFCI or arc-fault options add $10-$15 to the unit cost.
- Poles – 2-pole breakers cost up to twice that of single pole.
- High interrupting – HACR or marine duty carries a price premium.
- Specialty features – Switches, alarms etc. increase cost.
- Accessories – Breaker lockout kits and handles cost extra.
- Premium series – Higher end QO and Homeline Pro cost more than standard Homeline models.
While prices can range higher, typical Square D 20 amp breakers offer an ideal balance of value for a mid-tier budget. Investing a bit more upfront ensures years of reliable service.
How to Test a Square D 20 Amp Breaker
Testing a Square D 20 amp breaker is recommended before installing it or troubleshooting circuit issues. Here is how to test function:
Visual Inspection
- Check for damage like cracks or burn marks. Replace if found.
- Verify legible UL marking and amp/volt ratings.
- Confirm contacts are clean, not corroded or melted.
Continuity Test
- Use a multimeter on continuity setting to test between breaker terminals.
- Switch breaker ON – multimeter should show continuity.
- OFF position should show no continuity.
Wiggle Test
- With power OFF, wiggle breaker in panel to check for looseness. If loose, tighten mounting screws.
Manual Trip Test
- Switch breaker ON and press the self-test “TRIP” button to trip mechanism manually. Breaker should audibly click OFF.
- Reset breaker to ON position after test.
Load Test
- Connect a headlamp or other 20A load downstream of the breaker.
- Operate the load to verify correct tripping at 20+ amp draw.
If any test fails, replace the breaker. Testing ensures your new 20A Square D breaker is ready for safe installation.
What is the Difference Between Square D 20 Amp Breakers and Other Brands?
While meeting the same basic NEMA standards, Square D 20 amp breakers have some key differences from other major brands like GE, Eaton (Cutler Hammer), and Siemens:
- Reputation – Square D is an industry leader renowned for top-quality electrical components.
- Testing – Square D breakers undergo more rigorous UL testing with over 10,000 mechanical on/off cycles.
- Availability – As the most widely distributed, Square D breakers are easier to source from local suppliers.
- Compatibility – Square D 20A units have universal fit with most panels, unlike some brands.
- Warranty – Square D offers an industry-leading 5-year warranty on residential breakers.
- Price – Moderately priced compared to premium or economy-grade competitor brands.
- Support – Square D provides comprehensive technical support and customer service.
While other brands have merits, Square D’s premium safety ratings, performance track record, availability, and warranty coverage give their 20A breakers an edge for residential use.
Are Square D 20 Amp Breakers Compatible with All Panels?
A major benefit of Square D 20 amp breakers is that they are designed to be compatible with most major residential load centers and panelboards – not just Square D.
Specifically, Square D 20A 1-inch wide plug-on breakers are rated to reliably fit and function in panels from:
- Square D Homeline, QO, NQ, NF and Pow-R-Line panels
- GE TM2100 and THQL
- Siemens P1 panels
- Eaton CL, BR, and CT meter breaker panels
- Murray MP and MH panels
So while always verify specific compatibility, Square D 20A breakers can generally work across brands thanks to their universal terminal plug designs. This versatile compatibility makes Square D a great choice when replacing breakers in older panels from other manufacturers.
However very old Zinsco, FPE, or unlisted panels may have compatibility issues. Have an electrician verify breaker suitability if cross-brand compatibility is a concern.
How to Wire a Square D 20 Amp Breaker
Properly wiring a new Square D 20 amp breaker into a circuit is critical for safety and performance. Follow these wiring steps:
Step 1
Determine the wire size needed – use 12 AWG copper wiring for 20A branch circuits less than 100 feet in length. 10 AWG may allow longer runs.
Step 2
Select the required breaker type – 1-pole or 2-pole design depending on whether powering a 120V or 240V circuit.
Step 3
Choose a compatible panel location – pick a spot with the needed pole configuration in a compatible residential load center.
Step 4
Land the wires securely – land the hot and neutral wires under the correct screw terminals for a tight connection.
Step 5
Mount the breaker – align and push into the panel slot until fully seated. Don’t force into place.
Step 6
Check operation – switch the breaker on and off manually and verify smooth operation. Test circuit power.
Follow all NEC electrical codes and safety procedures when handling wiring. Call an electrician if unsure during the wiring process.
What is the Load Capacity of a Square D 20 Amp Breaker?
The load capacity of a standard Square D 20 amp 120 volt breaker is determined by a couple key factors:
- Continuous Load – 1920 watts (20 amps x 120 volts) for an extended time period
- Non-continuous Load – Up to 2400 watts intermittently
- Conductor Capacity – #12 AWG minimum; #10 AWG for longer distances
So in practical terms, a Square D 20 amp breaker should be continuously loaded to no more than 16-18 amps to allow a safety buffer and prevent nuisance tripping.
That equates to powering around 15-20 LED light fixtures or bulbs, a window AC unit, or a couple of appliances like microwaves or dishwashers. High start-up current devices need a bit more capacity.
The key is balancing the circuit load to stay well below 20A continuous draw rating of the breaker. This ensures safe, reliable overcurrent protection without overloaded circuits or tripping issues.
Conclusion
Installing properly rated and high quality breakers like the Square D 20 amp model is a wise investment in electrical safety. Square D is a trusted industry leader, providing time-tested performance and innovative features in their breakers.
This comprehensive guide covers everything homeowners or electricians need to know – from technical specifications to installation and troubleshooting. While 20 amp breakers are common, don’t forget the importance of proper sizing, ratings, and installation compliant with electrical code.
Square D makes selecting and installing the right 20 amp breaker for your home’s lighting, outlet and appliance circuits simple and dependable. Their extensive Compatibility, safety testing and warranty coverage let you upgrade your electrical service with confidence.
