Square D EJB34020SA Miniature Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Quantity
Square D EJB34020SA - 20A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Providing advanced control, the Square D EJB34020SA is a 20A, 3-pole breaker equipped with a 120VAC shunt trip. This accessory allows the breaker to be tripped remotely for added safety. This E-Frame breaker mounts into Square D NF panelboards. It utilizes a bolt-on connection and standard lugs to ensure a secure fit for commercial systems. Delivering 65 kAIC at 480Y/277V, it offers robust thermal-magnetic protection. The unit features a Visi-Trip indicator and carries HACR and HID ratings.Specifications
| Brand | Square D |
|---|---|
| Series | EJB |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 65kA @ 480Y/277VAC |
| Frame Type | EJB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NF Panelboards |
| Wire Gauge | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG (Cu) / 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, HACR, HID, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Visual Trip Indicator |
Product FAQs
8 answersWhat panelboards are compatible with the Square D EJB34020SA circuit breaker?
This 3-pole, bolt-on E-frame circuit breaker is designed exclusively for installation in Square D NF series panelboards.
What does the SA suffix indicate in the EJB34020SA catalog number?
The SA suffix designates that the breaker includes a factory-installed 120VAC shunt trip accessory. This allows the breaker to be tripped remotely via a control signal for emergency shutdowns or safety interlock systems.
Can I field-install a shunt trip on a standard EJB34020 breaker?
No. For Square D E-frame circuit breakers, all electrical accessories, including shunt trips and auxiliary switches, are strictly factory-installed and cannot be added in the field.
Does the EJB34020SA require extra mounting space in the panelboard?
Yes. Because it houses the factory-installed shunt trip mechanism, the EJB34020SA requires four pole spaces in an NF panelboard, whereas a standard 3-pole EJB breaker only requires three spaces.
Is the EJB34020SA rated for HVAC and lighting applications?
Yes, this 20-amp breaker is HACR-rated for use with heating, air conditioning, and refrigeration equipment. It is also HID-rated for controlling high-intensity discharge lighting loads.
What are the instantaneous trip current thresholds for this breaker?
The magnetic trip unit on this 20-amp breaker has a holding current of 270 amps (the maximum current it will carry without tripping instantaneously) and a trip current of 875 amps (the threshold at which it is guaranteed to trip).
How does the Visi-Trip indicator function on the EJB34020SA?
When the breaker trips due to an overcurrent or short circuit event, the handle moves to a center position and a bright red indicator appears in a window on the face of the breaker. This allows electricians to quickly locate the tripped circuit inside a crowded panel.
What is the difference between Square D EDB, EGB, and EJB 20-amp circuit breakers?
The difference is their interrupting rating (AIC) at 480Y/277VAC. The EDB series is rated at 18kA, the EGB series at 35kA, and the EJB series provides the highest tier of protection at 65kA. All three share the same physical dimensions and install into NF panelboards.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 12 reviews.
- EOEric O.Verified BuyerReviewingSquare D EJB14040 - 40A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Breaker Replacement
I needed a replacement breaker fast, and SuperBreakers pulled it off for me without any issues.
- BBBrad B.Verified BuyerReviewingSquare D EJB34125 - 125A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/27/26Breaker Order
Thanks! Ordering was easy and the part was delivered quickly and accurately. All I can ask for!
- RRRodolfo R.Verified BuyerReviewingSquare D EJB34015 - 15A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars1/14/26Satisfied Customer
The breaker was received in good condition and it works good. Lead time was not long it all.
Very happy with SuperBreakers Rep. Good customer service.
- RNRandy N.Verified BuyerReviewingSquare D EJB34070 - 70A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars11/14/25Breaker value
saved a lot compared to what the electrician wanted to charge us, at least half the price.
- TWTimothy W.Verified BuyerReviewingSquare D EJB34020 - 20A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/15/25Circuit Breaker
Product arrived in a timely matter and met expectations to repair the problem that we had.