Square D SFA1040A Molded Case Circuit Breaker
- 40A
- 1 Pole
- I-Line
Quantity
Square D SFA1040A - 40A 1 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed to handle heavy electrical loads, the Square D SFA1040A is a 1-pole, 40A molded case circuit breaker. It provides essential thermal-magnetic protection with long-time and instantaneous (LI) trip functions. This unit mounts into Square D I-Line panelboards and can replace legacy FA14040A breakers. Featuring a 25kA AIC rating at 240VAC and a factory-configured Phase A connection, this IEC-rated breaker ensures reliable performance in commercial facilities.Specifications
| Brand | Square D |
|---|---|
| Part Number | SFA1040A |
| Series | SFA |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | I-Line |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 25kA @ 240VAC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Phase A Connection (Factory Configured) |
| Standards | IEC 60947-2, UL 489 |
| Approval | IEC, UL |
| Temp Rating | -25C to 70C |
| Construction Features | IEC Rated, Non-Interchangeable Trip, Phase A Connection |
Product FAQs
6 answersWhat panelboards are compatible with the Square D SFA1040A?
This breaker is designed specifically for Square D I-Line panelboards and switchboards. It is not compatible with NQ, NF, or standard residential QO load centers.
How does the SFA1040A mount into the panel?
It utilizes the Square D I-Line style plug-in connection. The breaker plugs directly onto the I-Line bus stack, which allows for rapid installation and eliminates the need for bolted bus connections.
What wire sizes can be used with the SFA1040A lugs?
The factory lugs on this breaker accept wire gauges ranging from 14 AWG up to 1/0 AWG.
What type of protection does the SFA1040A provide?
It features a fixed thermal-magnetic trip unit. The thermal mechanism responds to sustained overloads, while the magnetic mechanism provides instantaneous tripping during short-circuit events.
What does the 25kAIC rating indicate for this breaker?
The 25kAIC rating means the breaker can safely interrupt a fault current of up to 25,000 amps at 240V AC. This high interrupting capacity helps protect downstream equipment during severe short circuits.
Can I adjust the trip settings on the SFA1040A?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The trip settings are factory-calibrated and cannot be adjusted in the field.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.