Overview
The Square D EHB4 is a single-pole molded case circuit breaker rated for 15 amps and 277VAC operation. This classic breaker design provides reliable overcurrent protection in low-voltage electrical networks and is ideal for replacement or retrofit applications where original equipment specifications call for this model.
Key Features
- Single pole (1P) configuration for single-circuit protection
- 15 amp rating with 277VAC voltage specification
- Clamp terminal electrical connection for straightforward installation
- SPST (Single Pole Single Throw) contact configuration
- Thermal-magnetic trip mechanism for fast fault detection
- Standard DIN rail or panel-mount compatibility
Technical Specifications
- Amperage Rating: 15A
- Voltage Rating: 277VAC
- Poles: 1
- Contact Type: SPST (Single Pole Single Throw)
- Interrupting Rating: 14,000 Amps @ 277VAC (typical for EHB series)
- Terminal Type: Clamp (lug ready)
- Wire Gauge Compatibility: 1–5 AWG
- Operating Temperature Range: Standard industrial (-10°C to 50°C)
- Mounting: Panel or DIN rail
- Manufacturer: Square D (Schneider Electric)
Typical Applications
- Branch circuit protection in commercial and light industrial panels
- Lighting and small motor circuits rated under 15A
- Single-phase 277VAC applications (common in three-phase delta systems)
- Retrofit and replacement projects in legacy electrical systems
- Equipment control circuits and branch distribution
Compatibility & Replacements
Compatible With
- E-frame panelboards rated for 480Y/277V systems
- Square D E-frame breaker enclosures
- Standard thermal-magnetic protection schemes
- Commercial and industrial 277VAC single-phase circuits
Replaces / Drop-In Replacement For
- Original Square D EHB4 1-pole 15A breakers
- Similar-rated molded case breakers in legacy installations
- Note: Always verify compatibility with your specific panel and system integrator before installation
Works With
- Square D panelboards and switchgear
- Standard electrical distribution systems rated for 277VAC
- Thermal-magnetic protection circuits
- Commercial power distribution and control applications
