Westinghouse | 504C740G18 | Circuit Breaker | 40A | 3-Pole | 415V

Westinghouse 504C740G18 is a 40-amp, 3-pole circuit breaker designed for demanding 415V three-phase systems. Built for maintenance, retrofit, and replacement projects, it delivers reliable overcurrent protection while aligning precisely with your existing panel’s specifications. When exact compatibility matters, the part number 504C740G18 is the most reliable reference to ensure a correct fit.

Key specifications

• Amperage: 40A
• Poles: 3-Pole
• Voltage rating: 415V
• Part number: 504C740G18
• Application: maintenance, retrofit, and replacement in compatible panels

Why this 3-pole breaker matters for your system

In three-phase networks, a 3-pole circuit breaker protects all three live conductors simultaneously, reducing the risk of unbalanced loads and equipment damage. A 40A rating is well-suited for moderate three-phase equipment and motors running on 415V, offering fast, predictable tripping to minimize downtime. This Westinghouse unit is built to match the form, fit, and electrical characteristics expected in legacy and modern installations, simplifying upgrades and long-term reliability.

Ideal use cases

• Replacing a failed or worn-out breaker in Westinghouse-compatible panels that require a 3-pole, 415V device
• Retrofit projects where an exact spec match is critical to maintain panel labeling and protection profiles
• Maintenance downtimes where a ready-to-install, drop-in replacement minimizes service interruptions

Fit, compatibility, and installation tips

Before ordering, verify that your equipment and panel are rated for 40A, 3-pole protection at 415V and that the physical footprint matches the Westinghouse 504C740G18. Use the part number as the primary compatibility check, and cross-reference your panel’s data sheet or labeling to confirm the exact interrupting rating and trip characteristics. When installing, ensure the electrical connections are secure, the panel is de-energized, and follow all safety procedures for proper seating and alignment.

What sets this apart

What makes the Westinghouse 504C740G18 unique is its precise alignment with legacy and current Westinghouse panels, delivering a true plug-and-play replacement path for 3-phase, 415V circuits. Rather than generic substitutes, this unit provides the exact spec combination—40A, 3-pole, 415V—so you can restore protection without modifying wiring or panel configurations. This specificity reduces guesswork and helps keep equipment uptime intact.

Whether you’re conducting routine maintenance, upgrading an aging installation, or performing a scheduled retrofit, the Westinghouse 504C740G18 circuit breaker offers dependable protection, straightforward compatibility checks, and a clear reference point (the 504C740G18 part number) to ensure you’re getting the right device the first time.