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Square D Y1B120 Molded Case Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Square D
Y1B120
Molded Case Circuit Breaker
Brand
Square D
SKU
Y1B120
Quantity
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Square D Y1B120 - 20A 1 Pole Molded Case Circuit Breaker
Re-Certified
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Square D Y1B120 - 20A 1 Pole Molded Case Circuit Breaker
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Quantity
| Brand | Square D |
|---|---|
| Part Number | Y1B120 |
| Series | Y1B |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 277VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 277VAC |
| Frame Type | Y1B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NY1B Panelboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | SWD Rated |
Quantity
Square D Y1B120 - 20A 1 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | Y1B120-R |
| Series | Y1B |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 277VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 277VAC |
| Frame Type | Y1B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NY1B Panelboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | SWD Rated |
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Description
Built for commercial 277VAC lighting distribution, this single-pole 20A breaker delivers dependable thermal-magnetic overcurrent protection. It is engineered to support 277V applications in industrial facilities. Designed as a bolt-on unit, it mounts into obsolete Square D NY1B panelboards, providing a seamless fit for older infrastructure. The breaker utilizes standard load side lugs for secure wire terminations. Carrying an SWD rating, it is approved for switching fluorescent lighting loads.Specifications
| Brand | Square D |
|---|---|
| Part Number | Y1B120-R |
| Series | Y1B |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 277VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 277VAC |
| Frame Type | Y1B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NY1B Panelboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | SWD Rated |
Product FAQs
5 answersWhat panelboards accept the Square D Y1B120 circuit breaker?
The Y1B120 is designed exclusively for installation in legacy Square D NY1B panelboards. It features a bolt-on mounting style to secure directly to the panel bus.
What type of electrical systems typically use the Y1B120 breaker?
As a single-pole 277VAC breaker, it is commonly installed in 277/480V three-phase, four-wire commercial and industrial systems to provide line-to-neutral branch circuit protection.
Can the Y1B120 be used to control fluorescent lighting?
Yes, this breaker carries an SWD (Switching Duty) rating, making it approved for switching fluorescent lighting loads in 277V commercial and industrial distribution systems.
What type of overcurrent protection does the Y1B120 provide?
It features a fixed thermal-magnetic trip unit with Long-Time and Instantaneous (LI) functions. The thermal element responds to sustained overloads, while the magnetic element trips immediately during short circuits.
How are the load-side wires terminated on the Y1B120?
The breaker is equipped with standard mechanical lugs on the load side for secure wire terminations.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- BHBrian H.ReviewingSquare D Y1B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/6/22works great, superb packaging
works great, superb packaging
- CFCharles F.ReviewingSquare D Y1B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/6/18Breaker
Easy to order and was here in no time