Cutler-Hammer M343A Circuit Breaker, 100A, 3-Pole, 240V

The Cutler-Hammer M343A Circuit Breaker delivers dependable overcurrent protection for demanding industrial panels. This model is built to safeguard your three-phase systems with precision, making it a reliable choice for service, maintenance, and replacement projects.

Key specs at a glance: 100 A, 3-pole configuration, 240 V operation. The M343A is designed to protect three-phase circuits and the equipment they feed, helping prevent costly downtime from electrical faults.

• Reliable three-phase protection for motors, feeders, and other 240 V loads that power your manufacturing lines and critical processes.
• Quick, compatible replacement option for existing installations that list the M343A as the part number, simplifying sourcing and stocking for maintenance teams.
• Part-number guided compatibility—verify fit by the M343A designation and ensure it meets your application requirements before installation.
• Industrial-grade design built to endure the demands of ongoing service and frequent cycling in industrial environments.
• Streamlined procurement with a proven model used across a range of industrial applications, reducing guesswork when planning panel upgrades or replacements.

This 3-pole, 240 V circuit breaker is ideal for electrical professionals, panel builders, and maintenance teams working with three-phase equipment in manufacturing facilities, processing plants, and large commercial installations. It delivers the protective performance you need without complicating your inventory or install process.

Why this matters: protecting three-phase circuits at 240 V helps prevent motor stalling, equipment damage, and unscheduled shutdowns. The M343A’s 100 A rating ensures appropriate protection for high-current loads while enabling safe, controlled tripping when faults occur.

How to verify compatibility: confirm the part number (M343A) matches your panel or equipment requirements, and ensure the 100 A, 3-pole, 240 V specifications align with your load profile. If you need help matching a part number or confirming compatibility, message us and we’ll assist you in making the right selection.