A1B340 - 40 Amp Circuit Breaker

A1B340 -  40 Amp Circuit Breaker

The A1B340 circuit breaker is used in many commercial and industrial electrical systems where dependable circuit protection is needed without changing existing equipment layouts. With a 40-amp rating and 3-pole design, it helps protect circuits from overloads and short circuits while working with compatible A1B panelboards and distribution systems. The bolt-on mounting style creates a secure connection inside the panel, helping reduce movement and maintain steady performance over time.

This thermal magnetic circuit breaker is rated for 10k A.I.C. at 240VAC and is commonly installed in three-phase electrical applications such as HVAC equipment, lighting systems, and distribution panels. Its compact size makes it easier to fit into existing electrical setups where space may already be limited. For electricians, contractors, and maintenance teams handling repairs or replacement work, the A1B340 provides the form, fit, and function needed to keep your systems operating properly. Built to last, it remains a practical choice for your everyday electrical protection in working environments that rely on consistent power distribution.

Key Features and Benefits

• 40 Amp circuit breaker designed for branch circuit protection
• 3-pole configuration for three-phase electrical systems
• Bolt-on mounting provides a secure panel connection
• Thermal magnetic trip unit responds to overloads and short circuits
• 10k A.I.C. rating at 240VAC
• Compact design fits compatible panelboards and distribution equipment
• Built for long-term use in commercial and industrial applications
• Designed for form, fit, and functional replacement in compatible A1B systems

Technical Specifications

• Part Number: A1B340
  
• Type: A1B
  
• Poles: 3
  
• Amperage Rating: 40A
  
• Voltage Rating: 240VAC
  
• A.I.C. Rating: 10kA @ 240VAC
  
• Trip Unit Type: Thermal Magnetic
  
• Mounting Style: Bolt-On
  
• Dimensions:
  • Width: 2.25" W
  • Height: 6.00" H
  • Depth: 2.31" D

Material Compliance and Certifications

• Manufactured for use in accordance with applicable electrical distribution standards
• Designed for installation in compatible electrical equipment and panelboards
• Thermal magnetic protection supports safe circuit operation
• Suitable for maintenance and replacement applications where code compliance is required

Where It Works Best

• Commercial office buildings
• Industrial and manufacturing facilities
• HVAC systems and motor control equipment
• Lighting panels and distribution boards
• Three-phase power distribution systems
• Control panels requiring bolt-on breaker installation
• Electrical maintenance and replacement projects
• Applications requiring compatibility with existing A1B-series equipment