Federal Pacific HEF437020 Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Federal Pacific
HEF437020
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
HEF437020
Quantity
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Federal Pacific HEF437020 - 20A 3 Pole Molded Case Circuit Breaker
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Description
A drop-in replacement for aging commercial infrastructure, the Federal Pacific HEF437020 is a 20A, three-pole molded case circuit breaker. It keeps existing electrical systems operational without requiring complete panel upgrades. This bolt-on MCCB installs into classic FPE panelboards and switchboards. Serving as an exact cross-reference for the NEF437020, it offers a seamless fit. The thermal-magnetic breaker provides 42kAIC at 240VAC and accepts 14-2 AWG wire via included lugs.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | HEF437020 |
| Series | HEF |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 22kA @ 480VAC |
| Frame Type | HEF |
|---|---|
| Terminal Type | Lugs |
| For Use With | FPE Panelboards and Switchboards |
| Wire Gauge | 14-2 AWG (Cu/Al) |
| Max Wire | 2 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity |
Product FAQs
6 answersWhat type of panels accept the HEF437020 circuit breaker?
This bolt-on molded case circuit breaker is designed exclusively for legacy Federal Pacific Electric (FPE) commercial panelboards and switchboards configured for H-frame breakers. It will not fit in standard residential load centers.
Can the HEF437020 be used to replace an NEF437020 breaker?
Yes. The HEF437020 shares the exact physical dimensions and bolt-on mounting configuration as the NEF437020. It provides a higher interrupting capacity (22kAIC versus 14kAIC at 480VAC), making it a safe, direct drop-in upgrade for older FPE panels without requiring aftermarket adapters.
What does the LI trip function code indicate on this FPE breaker?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The long-time function protects against sustained overloads, while the instantaneous function clears short-circuit faults. Both trip settings are fixed on the HEF437020.
Are load-side lugs included with the HEF437020?
Yes, the HEF437020 comes equipped with factory-installed load-side lugs. These terminals are dual-rated for copper and aluminum conductors ranging from 14 AWG to 2 AWG.
Can this 480V-rated breaker be installed in a 240V system?
Yes, the HEF437020 is dual-rated for 480VAC and 240VAC applications. When applied to a 240V system, the maximum interrupting capacity increases from 22kAIC to 42kAIC.
Are original Federal Pacific HEF-frame breakers still manufactured?
No, Federal Pacific Electric (FPE) is no longer in business, and the HEF series is obsolete. However, exact drop-in replacements are still sourced to safely maintain and service existing legacy FPE commercial switchboards without requiring panel modifications.
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