Square D FYB14020B Molded Case Circuit Breaker
- 20A
- 1 Pole
- I-Line
Square D
FYB14020B
Molded Case Circuit Breaker
Brand
Square D
SKU
FYB14020B
Quantity
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Square D FYB14020B - 20A 1 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the Square D FYB14020B is a thermal-magnetic molded case circuit breaker providing reliable overcurrent protection. Designed to fit Square D I-Line panelboards, this 1-pole breaker features a plug-on mounting style. As a legacy F-frame component, it is officially replaced by the BDA140203 for modern panel upgrades. Rated at 18 kAIC at 277VAC, the unit includes a factory-configured Phase B connection. It is HACR and SWD rated for lighting and HVAC loads.Specifications
| Brand | Square D |
|---|---|
| Series | FY |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | I-Line |
| Voltage | 120VAC, 240VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 18kA @ 120VAC, 18kA @ 240VAC, 18kA @ 277VAC, 10kA @ 125VDC |
| Frame Type | FYB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-4 AWG (Cu), 12-4 AWG (Al) |
| Max Wire | 4 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 Thermal, Fixed Magnetic |
| Available Options | Handle Padlock Attachment |
|---|---|
| Accessories | Phase B Connection (Factory Configured) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Phase B Connection |
Product FAQs
5 answersWhat does the B in the FYB14020B catalog number signify?
The B indicates that this 1-pole breaker is factory-configured for a B-phase connection on the bus of a Square D I-Line panelboard or switchboard.
Is the Square D FY frame still in active production?
No, the FY series is a legacy F-frame molded case circuit breaker that has been discontinued by Schneider Electric. It has been superseded by the modern PowerPact B-frame series for new installations and panelboard upgrades.
How does the FYB14020B connect to the electrical system?
This breaker utilizes a shrouded I-Line plug-on jaw on the line side to snap directly onto the panelboard bus. The load side features a mechanical lug that accepts 14 to 4 AWG copper or 12 to 4 AWG aluminum wire.
Can the FYB14020B be installed in DC control circuits?
Yes, this breaker is rated for up to 125 VDC with a 10 kA interrupting capacity, allowing it to protect specific direct current control or distribution circuits.
How does the LI trip function operate on this F-frame breaker?
The LI designation indicates a fixed thermal-magnetic trip unit. The thermal element provides long-time protection by heating up and tripping during sustained overloads, while the magnetic element offers instantaneous protection to clear severe short circuits immediately.
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