EH34040 | Square D EH Series 40A 3-Pole 480Y/277V Plug-In Circuit Breaker
Square D · Circuit Breakers & Protection
Description The Square D EH34040 is a three-pole molded case circuit breaker designed to provide reliable overcurrent and short-circuit protection in commercial electrical distribution systems. Rated at 40 amps and 480Y/277 VAC, this breaker uses thermal-magnetic trip technology to deliver long-time and instantaneous protection. It is engineered for plug-in installation in compatible Square D NEH panelboards. Technical Specifications Condition New/Never Used Surplus Brand Square D Category Circuit Protection Part Number EH34040 Subcategory Circuit Breakers Series EH Product Type Molded Case Circuit Breaker Frame Type EH Rated Current 40 A Number of Poles 3 Phase Three Phase Voltage Rating 480Y/277 VAC Protection Type Thermal-Magnetic Interrupting Rating 14 kAIC @ 277 V Connection Type Plug-In Wire Size AWG 14–2 Aluminum/Copper Functions Long-Time and Instantaneous (LI) Ambient Temperature Rating 40 °C Application Power Distribution Weight 3.0 lb (approx.) Information About EH34040 The EH34040 is part of Square D’s EH series of molded case circuit breakers, developed for compact branch circuit protection in low-voltage panelboard applications. This breaker incorporates a thermal-magnetic trip unit that protects circuits from overloads and short-circuit faults while maintaining stable operation. It is designed for three-phase electrical systems and supports both copper and aluminum conductors within a defined wire range. Built to meet UL and CSA requirements, the breaker is intended for dependable operation in controlled commercial and light industrial environments. Key Features: 40 Amp Current Rating: Provides accurate protection for three-phase branch circuits. Three-Pole Configuration: Ensures balanced protection across all phases. 480Y/277 VAC Rating: Suitable for common commercial power distribution systems. Thermal-Magnetic Protection: Combines long-time overload and instantaneous trip functions. Plug-In Mounting Design: Enables secure installation in compatible NEH panelboards. 14 kA Interrupting Rating: Rated for fault protection at 277 VAC. Copper and Aluminum Compatibility: Accepts conductors from AWG 14 to AWG 2. The EH34040 delivers the reliability and precision required for commercial three-phase power distribution protection.
Brand: Square D · Category: Circuit Breakers & Protection
Key features
- 40 Amp Current Rating: Provides accurate protection for three-phase branch circuits.
- Three-Pole Configuration: Ensures balanced protection across all phases.
- 480Y/277 VAC Rating: Suitable for common commercial power distribution systems.
- Thermal-Magnetic Protection: Combines long-time overload and instantaneous trip functions.
- Plug-In Mounting Design: Enables secure installation in compatible NEH panelboards.
- 14 kA Interrupting Rating: Rated for fault protection at 277 VAC.
- Copper and Aluminum Compatibility: Accepts conductors from AWG 14 to AWG 2.
Specifications
| Manufacturer part number | EH34040 |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Square D |
| Category | Circuit Protection |
| Part Number | EH34040 |
| Subcategory | Circuit Breakers |
| Series | EH |
| Product Type | Molded Case Circuit Breaker |
| Frame Type | EH |
| Rated Current | 40 A |
| Number of Poles | 3 |
| Phase | Three Phase |
| Voltage Rating | 480Y/277 VAC |
| Protection Type | Thermal-Magnetic |
| Interrupting Rating | 14 kAIC @ 277 V |
| Connection Type | Plug-In |
| Wire Size | AWG 14–2 Aluminum/Copper |
| Functions | Long-Time and Instantaneous (LI) |
| Ambient Temperature Rating | 40 °C |
| Application | Power Distribution |
| Weight | 3.0 lb (approx.) |
| Product type | Circuit Breakers |
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