Free Shipping Over $99
Federal Pacific NFS4340 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Plug-On
Federal Pacific
NFS4340
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFS4340
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Federal Pacific NFS4340 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Similar Items
20A 3 Pole Molded Case Circuit Breaker
15A 3 Pole Molded Case Circuit Breaker
40A 3 Pole Molded Case Circuit Breaker
Description
A drop-in replacement for aging infrastructure, the Federal Pacific NFS4340 is a 3-pole, 40A molded case circuit breaker. It is designed for commercial and industrial applications requiring 600VAC power distribution. This plug-on MCCB mounts into original Federal Pacific NFS panelboards. Utilizing exact N-Frame dimensions and stab-in mounting, it eliminates the need for retrofits when replacing obsolete components. Rated 18 kAIC at 600VAC, it provides standard LI thermal-magnetic protection.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFS4340-R |
| Series | NFS |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 18kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NFS Panelboards |
| Wire Gauge | 8-4 AWG |
| Max Wire | 4 AWG |
| Min Wire | 8 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
7 answersWhat panelboards are compatible with the NFS4340 circuit breaker?
This plug-on N-frame breaker is designed exclusively for installation in legacy Federal Pacific NFS panelboards. It uses a stab-in mounting mechanism for a direct fit without requiring retrofit adapters.
What wire sizes are accepted by the lugs on this 40-amp breaker?
The terminal lugs on this unit accept wire ranging from 8 AWG to 4 AWG. Ensure proper torque specifications are followed during installation.
Can this breaker be used in 480V or 600V systems?
Yes, it is rated for a maximum of 600VAC and provides an 18kA interrupting capacity at both 240V and 600V AC.
Is the Federal Pacific NFS4340 a direct replacement for older N-frame breakers?
Yes, it matches the exact dimensions and stab-in mounting style of original Federal Pacific N-frame breakers, making it a drop-in replacement for aging infrastructure.
What type of trip unit is included in this breaker?
It features a non-interchangeable thermal-magnetic trip unit with fixed long-time and instantaneous (LI) functions for standard overcurrent and short-circuit protection.
Does this breaker require a separate mounting kit for installation?
No, the NFS4340 features a plug-on connection type that stabs directly into the bus of compatible Federal Pacific NFS panelboards, requiring no additional mounting hardware.
Is this circuit breaker HACR rated?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment.
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.